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Distortion reducer Microwave semiconductor devices I www.americanradiohistory.com W`ircic + 5 J w 0 -5 ' r -10 4 -15 w -20 10 100 10k 20k 1k FREQUENCY > - (Hz) 5 Q -lo cr -15 20 100 During such a listening test, the parameters of the room housing the loudspeaker plays a large part, while 10k 20k 1k FREQUENCY (Hz) www.americanradiohistory.com recordings are not above suspicion in respect of the linearity of amplitude response. Even if all such sources reached the impeccable standards which the engineers concerned strive so successfully to meet, there would remain the personal preferences of the user. It takes a brave man to refrain from just-a -touch on the tone controls when demonstrating the superiority of his latest equipment to a fellow enthusiast (competitor ?). Of all the tone controls proposed, the most generally accepted is due to P. J. Baxandall, basing itself on a feedback rather than a passive network. This allows for true boost or cut to either low or high frequencies relative to an unchanging centre frequency, generally 1kHz. Two potentiometers are used, adjusting the feedback in the two frequency regions separately around a virtual earth amplifier such that the gain in these regions varies typically from 0.1 up to 10 i.e. 20dB. The higher the quality of the sources and other links in the chain the smaller the range covered by these tone controls need be. More complex tone controls may be used to sub -divide the frequency spectrum still further; though purists will reject this approach as it smacks of gimmickry, there can be a case for it for various forms of electronic musical instruments and in sound effects. One possibility is the use of parallel channels each consisting of a low -Q band-pass filter using sufficient channels that the mixed signal has very little ripple in its overall amplifier response characteristic when all controls are level. It is convenient for producing relatively small amounts of boost and cut at selected regions in the spectrum and may be augmented by active filters with higher Q if stronger effects are needed. The mixer circuits used in such a system, as when mixing inputs from tape, disc, radio, are now frequently based on the see -saw amplifier feeding to the virtual earth through appropriately scaled resistors. If it is desired to obtain significant voltage gain from the mixer as well as having multiple inputs, the bandwidth restrictions are more severe, being in effect determined by the total gain used, i.e. the sum of the gains with respect to various inputs. Phase shift in the operational amplifier at all frequencies above 10Hz is such as to make the virtual earth point have a largely inductive impedance, i.e. one that rises proportional to frequency. As a final comment on the possibility of multi -band operation of audio systems it can be argued that limiting the number of loudspeaker drive units to two (a woofer and a tweeter) with the occasional addition of a mid -range squawker is too restrictive. Accordingly we suggest a new classification scheme of dividing the spectrum from 10Hz to 30kHz into seven bands each to be handled by a separate loudspeaker, see table. Combined with quadraphonic operation surely an export hnnm meet he the recnit9 Wireless World, February 1973 87 Versatile Triangle Wave Generator constructional project which forms a `building brick' for more complex test systems A by D. T. Smith* This article describes a triangle wave generator whose frequency can be controlled in a variety of ways. Its frequency can be made to vary linearly with a potentiometer setting; the period can be made to vary linearly with a resistor and frequency can be varied exponentially over several decades, or swept with an input voltage. It uses cheap non -critical components, and is suitable for use from well below 1Hz to the MHz region. If required the triangle can be shaped to a sinewave, so that the oscillator can be used as a wide range or swept sinewave generator that avoids the problems associated with the direct generation of sinewaves at low frequencies. Also, a square wave output is available if required. constant current generator Fig. 1. A reverses and the capacitor voltage sweeps in a negative direction. This continues until the output falls below the bias of the lower level comparator, when the bistable is triggered back to its original state and the cycle is repeated. If the buffer has unit gain, and there is a difference, V, between the comparator bias levels, the capacitor voltage must change by 2V per cycle. Hence the frequency of oscillation is block diagram of the oscillator. f-2C,V or via a 'current mirror' circuit to C,. This current mirror gives an output current equal in size but opposite in direction to its input current. Thus the capacitor voltage sweeps linearly -up or down as controlled by the switch. When the switch is feeding current to the current mirror, the capacitor voltage will sweep in the positive direction until the output exceeds the bias of the upper level comparator. Then the comparator triggers the bistable so that the switch Principle of operation A block diagram of the oscillator is shown in Fig. 1. The output of a constant current generator is fed through an electronic switch either directly to the capacitor C, *Clarendon Laboratory, Oxford. Circuit details Fig. 2 shows the circuit diagram of the oscillator (except for the current generator which is described later). The emitter coupled pair Tr3, Tr4 switch the input current, and the switch is controlled by 200mV signals from the bistable. In the current mirror Tr1, Tr2, the voltage drop caused by the input current flowing in R, and the emitter junction of Tr, equals the O output triangle wave +15V oV Tr3 constant current generator (see text) 15v Fig. 2. Circuit diagram of the oscillator. www.americanradiohistory.com Wireless World, February 1973 88 0V 0V drop caused by the output current in R2 and the emitter junction of Tr2. Thus, if R1 and R2 are equal, and the transistors are similar, the output current will equal the input current, and with the values shown the circuit operates for currents ranging from below 1nA to about 500µA. The capacitor voltage is buffered by a source follower Try. The output is taken to the comparator Tr6, Tr7 and compared with a fixed bias of + 10V. When the output exceeds + 10V, Tr7 conducts and triggers the bistable circuit Tr10, Tr11. The output is also fed to a second comparator Trei Tr9 and compared with a + 5V bias, so that the bistable is reset when the output falls below + 5V. The output is thus a triangle wave between the limits + 5 and + 10V. A photograph of the output waveform is shown on -15V -15V (a) The output waveform at 1 kHz. (b) 100 15k 1k (c) 80 r C1 820 the left. = 100n 60 Constant current generator 15V Fig. 3. (a) Current genera or for the direct calibration offrequency. (b) Current generator for the direct calibration of period. (c) Current generator for a very wide frequency range. 40 20 0 200k 400k 800k 600k 1M R (ohms) Fig. 5. Oscillator performance with current generator 4(b) demonstrating linear period calibration. 1,200 1,000 C =1on 800 1M C1=10 600 10k 400 100 200 200 o 400 600 800 1,100 HELIPOT READING Fig. 4. The oscillator performance using the current generator shown in Fig. 4(a) demonstrating a linear frequency calibration. -10 -8 -6 -4 -2 V¡ (volts) Fig. 6. Performance of the oscillator using the very wide frequency current generator. +15V triangle wave input O The versatility of this oscillator stems largely from the fact that its frequency is controlled by a single current generator, and this generator can be adapted to meet a variety of needs. If only a single frequency is required, this generator can be a simple resistor to the negative line. Fig.3(a) shows a current generator suitable for use when an oscillator with a linear frequency calibration is wanted, as the frequency varies linearly with the potentiometer setting. If Cl is 1OnF and a ten turn helipot is used with the dial set to read from 1 to 11 turns, the trimmer potentiometers can be set to give maximum and minimum frequencies of 1100 and 100Hz. The oscillator frequency can then be read straight from the helipot dial, as is shown in Fig. 4. By switching the capacitor in decade steps, a useful test oscillator can be built to cover a wide range of frequencies. If voltage control of frequency is required, a control voltage can be fed directly into the base of Tr2 in place of the voltage from the potentiometer. When an oscillator calibrated in period is required, the current generator shown in Fig. 3(b) is suitable. This gives a period proportional to R, as shown in Fig. 5. The exponential relation between collector current and base -emitter voltage in a transistor can be used to give a very wide frequency range in one band, as was previously described for use with multivibratorsl. Fig. 3(c) shows a suitable generator and its measured performance is shown in Fig. 6. When this circuit is used R1 and R2 should be changed to 47052 to allow the current mirror to work up to l OmA. Conversion to sine waves R3 11* sinewave output 0V 15V Fig. 7. A sine wave shaping circuit. www.americanradiohistory.com A triangle wave with its reasonably low harmonic content can be used in many applications where a sinewave has been traditionally used. However, when a low harmonic content is necessary, the nonlinear characteristics of a junction f.e.t. can be used to shape the triangle into a sine wave2. A suitable circuit is shown in Fig. 7. The d.c. output of the emitter follower is set to zero using R1 and the amplitude set with R2. The emitter follower is necessary to .,r.,.. 001, Wireless World, February 1973 give a low impedance drive to the shaping circuit. Some care in setting up is necessary here for good results. The V, and Ids, of the f.e.t. should be measured (i.e., the gate bias where the drain current falls to zero, and the saturation current at zero gate bias), and the peak -to -peak input level set to about 2.7Vp with R. and Rb set to about Vp 2ldss The input level is then adjusted for minimum 3rd harmonic and Rb set for minimum 2nd harmonic, using a wave analyser if available. A total harmonic content of less than 0.5% r.m.s. can be obtained with this circuit. References 'Multivibrators with seven decade range in period ', Wireless World, Vol. 78, No. 1436, 1972, pp. 85 -6. I. D. T. Smith, 2. R. D. Middlebrook and I. Richer, 'Non reactive filter converts triangular waves to sines ', Electronics, Vol. 38, No. 5, 1965, pp. 96 -101. Components List (Figs. 2, 4) R1 10k 10k 22k R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R1a 10k 10k 10k 10k 6.8k 100 10k 10k 6.8k 100 C1 see text C2 C3 C4 Co 0.1µF 0.1µF 4.7pF 4.7pF Semiconductors. Tr1,Tr2,Tr6,Tr7,Tr8,Tr9 All 2N4061 Tr3,Tra, Trio, Tr11,Tr12 All 2N5172 Tr5 2N3819 Components List (Fig. 8) Resistors O 1 22k pot. R4 100k pot. 00k RS 4.7k R6 1M 1M see text see text R, R R, 1 Semiconductors D, D2 D3 Tr, Tr2 Tr3 2N4061 2N5172 2N3819 1 - for Denton Vacuum Inc., who manufacture equipment for electron microscopy. A one -day standards course is to be held by the British Standards Institution at Hampden House, 61 Green Street, London W.I, on 23rd February. The course is intended primarily for firms new to standards work and deals with preparation of an individual standard to inter-relationship between British, international and European standards in the Common Market. Applications to the Secretary, Standards Associates Section, British Standards Institution, 2 Park Street, London W 1A 2BS. A three -day course, 'Minicomputers in industrial process control ', is to be held at the Polytechnic of Central London, 115 New Cavendish Street, London W1M 8JS, from 21st to 23rd March. The course is intended for managers, engineers and scientists interested in appraising state -of-the -art minicomputer technology. The management control of the Science Research Council's Astrophysics Research Unit has been transferred to the Radio and Space Research Station, Slough, Bucks. The unit will continue its activities for the present at the Culham Laboratory, Abingdon, Berks. - ESPA the - European Selective Paging Manufacturers Association has been formed by AEG Telefunken, Autophon, Hasler, Multitone, Telekontroll AB with headquarters in Eindhoven, Holland. The main purpose is to produce a standardization of regulations and technical specifications throughout Western Europe. Submissions for the 1973 MacRobert Award for technological innovation are invited by the Council of Engineering Institutions. Entries should reach the C.E.I. by the 30th April 1973. Copies of the rules and conditions can be obtained from The MacRobert Award Office, Council of Engineering Institutions, 2 Little Smith Street, London S.W.1. Ltd, the Swansea -based semiconductor manufacturers, have opened a sales office at Shirley Lodge, 470 London Road, Slough, Bucks. Siliconix Murphy Telecommunication Systems Ltd has opened additional premises at Brockenhurst Film Studios, Fibbards Road, Brockenhurst, Kent. The company's offices and works at Warrington and Trowbridge remain fully operative. Welwyn Electric Ltd have announced that their Strain Measurement and Equipment Division, based at Teddington, Middlesex, has opened an office in Sweden. The address is Uppfartsvagen 13, 171 32 Solna, Sweden. Itakel s.p.a., of Milan, Italy, export commissioner of SIT Siemens s.p.a. of the IRI -STET group, has been awarded a contract worth approximately £0.9M for the construction of three microwave radio relay links in Ethiopia and their respective multiplex equipments. Radar video recording equipment has been ordered from EMI to assist in flight testing new radars being developed for Europe's multi -role combat aircraft (M.R.C.A.). The contract has been placed with EMI Electronics' Systems & Weapons Division, Wells, Somerset. by Panavia GmbH the Munich firm developing the M.R.C.A. project. - Under contract to the Spanish Army, Racal-Mobilcal Ltd, 464 Basingstoke Road, Reading, Berks RG12 ORY, is to supply a rangs of h.f. radio communications systems worth approximately 12V zener 1S44 1S44 Lauriestone Electronics Ltd, Stepfield, Witham, Essex CM8 3TH, has signed an agreement with the Marconi Co., for the manufacture and sale under licence of the Marconi Meniscometer an instrument for measurement of solder 'wettability' of components or p.cs. V.A. Howe and Co. Ltd, 88 Peterborough Road, London S.W.6, have been appointed sole U.K. agent 4.7k Capacitors R1 Announcements N.I.R.A., Philips, Svenska Radio AB and Resistors R2 R3 89 £500,000. An agreement has been reached between Jermyn Distribution, Vestry Estate, Sevenoaks, Kent, and Weir Electronics Ltd, whereby Jermyn will stock printed circuit board power supplies manufactured by Weir. www.americanradiohistory.com Electrocomponents Associates Ltd, P.O. Box 19, Orchard Road, Royston, Herts. SG8 SHH, have taken over Pact International Electronics Ltd, who marketed test equipment and specialized instruments. Data Laboratories Ltd, Wates Way, Mitcham, Surrey, has developed a range of digital peripheral interfaces for the DL905 transient recorder, to permit direct connection to a digital computer as a high -speed signal acquisition device. Memorex Ltd, an American audio tapes company based at Freight House, Long Lane, Stanwell, Middlesex, has introduced a cassette storage system consisting of an aluminium library rack, six cassette album cases and a link piece for further additions. The address of both the Electronic Components Board and the Radio and Electronic Component Manufacturers' Federation is now 6th Floor, Liberty House, 222 Regent Street, London W R SEE. Tel. 01 -437 4127. 1 The Marconi International Marine Co. Ltd., Marconi House, Chelmsford, Essex, a GEC -Marconi Electronics company, has formed an Oil Industry Division which, in liaison with the specialist departments within the company, will be responsible for all sales, installation and service functions of Marconi Marine U.K. offshore oil industry activities. Electrocomponents Associated Limited, 13 /17 Epworth Street, London EC2P 2HA, the public company that includes RS Components, has taken over The Radio Resistor Co. Ltd, of Harrow, Middlesex. Reslosound Ltd, Reslo Works, Spring Gardens, London Road, Romford, RM7 9LJ, a subsidiary of Derritron, have been appointed U.K. and European marketers for Broadcast NC, of Maryland, U.S.A., manufacturers of the Spotmaster range of radio station cartridge systems. A.D.L. Technicare, 3C The Industrial Estate, Cores End Road, Bourne End, Bucks., an electronic repair and calibration company, have acquired the business of M.C.R. Avionics Ltd, of Elstree Aerodrome, Hertfordshire. The company will carry on trading under the name of Technicare Avionics and will specialize in the installation, maintenance and repair of communication and navigational equipment, primarilyin the aviation field. EMI Television Equipment, a division of EMI Sound and Vision Equipment Ltd, Hayes, Middlesex, has provided two monochrome television outside broadcast vehicles with power generators to the Nigerian Broadcasting Corporation for its Channel Ten service based in Lagos. The Decca Navigator Company Ltd, Decca House, 9 Albert Embankment, London S.E.1., has been awarded a contract worth over £100,000 to supply Mk. 19 Decca navigator airborne receivers, Danac computers and pictorial displays to the fleet of ten Sikorsky S -6l air /sea rescue helicoptors of the Royal Danish Air Force. B.A.C. is to install additional navigation aids in Jet Provosts operated by the R.A.F. Work valued at about £2M will include installation of direction and distance measuring equipment. Royal Air Force Strike Command has taken delivery of the MATELO (Maritime Air-Radio Telegraph Organization) ground -to -air, high- frequency communication network supplied to the Ministry of Defence (Air) by Marconi Communication Systems Ltd, Marconi House, Chelmsford, CM1 1PI. Marconi Communication Systems Ltd, Marconi House, Chelmsford, CM1 1PL, are to install a tropospheric scatter communications link between Dacca, the capital of Bagladesh, and Chittagong, the country's main port, a distance of 200km. This order has been placed at the request of the Bangladesh Ministry of Posts, Telegraph and Telephones through Global Imex, the Marconi representative in Bangladesh. Wireless World, February 1973 About People Perez, the Reading-based firm specializing in peripheral interfacing, off-line data handling and system design. Mr. Slatter received his honours degree in Electrical at Newcastle upon -Tyne, and went to A.E.I. Scientific Apparatus to work on Engineering data -acquisition and analysis systems. He was subsequently employed by I.C.L., West Gorton, where until joining Perez, he was a design engineer on test equipment for large computers. K. G. Smith has been appointed engineering consultant to the Paul Rhodes has joined the senior technical staff of Nelson Tansley to work on hospital nurse -call and ENTAL railway communications systems. He is well qualified for the position, having explored both fields of activity in his recent experience. Work on the commissioning of British Rail's trackside communications, during which he obtained a knowledge of worldwide codes of practice; was followed by eight years' service with Multitone, where he was engaged in marketing, installation and servicing of hospital communications in Europe and the Middle East. Aubrey Buxton, M.C., took office as president of The Royal Television Society for a two-year term on January 1st 1973. Mr. Buxton, who is executive director of Anglia Television and producer of Anglia's 'Survival' films, was educated at Ampleforth and Trinity College, Cambridge and served in The Royal Artillery from 1939-45. In 1968 Mr. Buxton was awarded the Royal Television Society's Silver Medal for outstanding artistic achievement. J. Stevenson, has been appointed director of operations for one of the five divisions of E.M.I. Sound and Vision Equipment Ltd., E.M.I. Industrial Components. He will be responsible for the administration of the Treorchy, Glamorganshire, factory and for component marketing at Hayes. Three employees of Standard Telephones & Cables and Standard Telecommunication Laboratories have been successful in the 1972 Telecommunication Engineering and Manufacturing Association T.E.M.A. Awards competition. Kevin Kelly, of S.T.L. Harlow, gained first prize in the Technologist Class for his essay 'The Doppler Microwave Landing System' and in the same class, Derek Glanville, also of Harlow, was awarded second prize for an essay on 'The Spectrum of Round-Off Noise in a Digital Filter '. Roger Faulks, who is in the Transmission Division at S.T.C., Basildon, won first prize the Technician Class for his specially commended essay 'Model Automatic Location Store '. in D. I. Williams, B.Sc., has been appointed a director of Electroplan Limited, the instrument distribution company of the Electrocomponents Associated Group. Mr. Williams, who is 37, has been Electronic Components Board to assist Sir Richard Melville, K.C.B., the director. Mr. Smith has been one of the R.E.C.M.F. representatives on the Board since 1968, having been chairman (1958 -59) and vice -president (1960 -64) of the R.E.C.M.F. He was also chairman of the R.E.C.M.F. Technical Committee from 1962 -1966. Before his retirement in 1971, Mr. Smith had been joint managing director of N.S.F. Limited and a director of Simms Motor and Electronic Corporation Ltd. He was leader of the representatives of the passive components makers to the 'Burghard' Committee. M. A. Gates has become deputy divisional manager (Lincoln) and manager of the Gas Tube Department of the English Electric Valve Company Limited. Coming to E.E.V. from the Sunderland c.r.t. factory of A.E.I. in 1958. Mr. Gates was head of the Chelmsford c.r.t. section until 1960, when he was appointed assistant manager of the Large Valves Section, becoming manager in 1966. NEW YEAR HONOURS general manager of Electroplan since its inception in April 1972. Farnell Electronic Components Ltd, of Leeds, announce the appointment of Ken Gledhill as sales and marketing director and of Ian Johnstone to the position of executive director. Among recipients of honours in the New Year list were the following: Knight Bachelor Dr. E. Eastwood, F.P..S., director of research, General Electric Company. relinquishes his directorships of C.B. C. P. Fogg, B.A., deputy controller of electronics, Ministry of Defence. C.B.E. P. A. Allaway, C.Eng. chairman and managing director, E:M.I. (Electronics) Ltd. A. Deutsch, technical director, Thorn Electronic Industries Ltd. G. C. Gaut, M.A., B.Sc., director of the Plessey Company Ltd. G. G. Gouriet, F.I.E.E., chief engineer, research and development, B.B.C. Prof. N. Kurti, F.R.S., professor of physics, Clarendon Laboratory, Oxford. O.B.E. .1. W. H. Cheesbrough, M.I.E.R.E., regional engineer, Midlands Tele- /S, communications region, Post Richard Slatter, B.Sc., has been appointed systems engineer by Office. W. G. D. Gunn, for services to sound broadcasting and television, S.E. Asia. H. C. Maguire, a director and general manager of Marconi Marine, retired on December 31st after 45 years with the company. Mr. Maguire served at sea as a radio officer from 1927 to 1936, when he joined the shore technical staff in Glasgow, work which was interrupted by a three -year wartime appointment in Montevideo. In 1948, he became contracts representative for southern Scotland, moving in 1950 to Liverpool, where he was later promoted to depot manager. Mr. Maguire was appointed manager of the export sales division at Chelmsford, becoming general manager in 1962. He also Norsk Marconikompani A Oslo, and Coastal Radio. www.americanradiohistory.com J. R. Pickin, B.A. (Hons.), general manager, engineering, Ferranti Ltd. M.B.E. W. W. Beebee, lately radio officer /purser, Coastal Relieving Duties, Glen Line. P. J. Darby, M.I.E.R.E. head of technical quality control, Independent Broadcasting Authority. K. G. Eve, officer-in- charge, Radio Communications Branch, Lancashire Constabulary. H. Hirst, chief electronics engineer, Naval guided weapons division, Hawker Siddeley Dynamics Ltd. P. H. Rice, electronics engineer, Marconi Space and Defence Systems, Stanmore. V': Rubenstein, head of reception department, monitoring service, External Broadcasting, B.B.C. C. H. Snell, senior production controller, Radar and Equipment Division, E.M.I. Electronics Ltd. Obituary Philip R. Berkeley, M.I.E.E. headof engineering for Thames Television, died suddenly on 10th January, aged 54. Mr. Berkeley spent twenty five years with Marconi's, working on many aspects of television, including transmitters, the Mk III camera and early outside-broadcast vehicles. He was responsible for the planning and installation of television studios in all parts of the world, including I.T.V's first studios, and was more recently concerned with the planning of Channel TV, Hong Kong Television Broadcasting, Thames studios at Teddington and television for South Africa. Mr. Berkeley was vice-president of the British Kinematograph Sound and Television Society. W. H. George, Ph.D., F.Inst.P., well known as a physicist in the field of acoustics, died in December, aged 75. He graduated at University College Nottingham, where he received his doctorate in 1925. Amongst the appointments he held was that of Royal Society Moseley Research Student, working under Sir W. H: Bragg in the Davy Faraday Laboratory at the Royal Institution, London. Later he lectured at Leeds and Sheffield Universities and at Southampton University College, finally being appointed Head of the Physics Dept. Chelsea College of Science and Technology. Dr. George was especially interested in music, in all its aspects. He published a number of research papers, including 'A sound reversal technique applied to the study of tone quality' and 'Science and Music '. Dr. George become more widely known in the 50s and 60s with his series of lectures, broadcast on the Third Programme, dealing with musical instrument acoustics. He frequently lectured on these subjects at Morley College and elsewhere and read papers to the B.S.R.A. and the B.K.S.T.S. Wireless World, February 1973 91 Experiments with Operational Amplifiers 7 Log circuits for multiplication, division and the (concluded). generation of powers by G. B. Clayton', B.Sc., F.Inst.P. Operational amplifier log and antilog converters may be combined in order to generate many non linear functions. The circuits are connected together in such a way that they perform the operations normally involved in logarithmic computation. Examples of such computations are described by the equations: ture the E' terms cancel, and by rearrangement we obtain: where n log - log y) = x/y Thus in order to generate an output signal proportional to the nth power of an input signal, a log converter is used to generate the log term, a resistive divider network is used to multiply the log term by a constant n and an antilog converter is then used to form the output signal. The action of such a system may be investigated using the circuit illustrated in Fig. 7.8. The circuit consists essentially of a combination of the temperature compensated log converter and temperature compensated antilog converter previously described. Referring to Fig. 7.8 the output of amplifier A, is, from eq. 7.4 (Jan. issue), Now Ic4 = Icl 43 42 R = R3, 42 = R and Ic3 Z Thus e' = CRJ - R6 Eo loglolct Ioz Ic2 lot (7.7) e;' R3 R4 e Rt In the circuit of Fig. 7.8 component values * Department of Physics, Liverpool Polytechnic. Tr1 2N3707 Ic1 +15V = I't R5+R6 R7+ R8 - R8 Ic4 given by R5+ It 4z Ic2 n antilog (logx +logy) = xy e of = 43 44 If we assume that the 4 terms cancel antilog (n log x) = x' antilog (log x Io3 /4 c4 are chosen so as to make the scaling factor unity and the power n = 3. It is suggested that e3 be made variable so as to allow for mismatch in the I' terms. The setting up procedure for the circuit then consists of applying an input signal of exactly one volt and adjusting the value of e3 so as to obtain an output signal of exactly one volt. Experimental results obtained with the circuit are shown graphically in Fig. 7.9. The second set of results in Fig. 7.9 were obtained with resistor values R5, R6, R, and R8 chosen so as to make n = Z. The following values were used: R6 = Re = 1k1, R5 = 5.6k0, R, = 12kQ. In Fig. 7.9 the lines show the calculated functions, eo = e13 and e' = e;4 respectively and the plotted points indicate experimentally obtained data. The resistor values used to set powers were of 5% tolerance. Greater conversion accuracy would, of course, be assured by selecting resistor values to precisely fix the power n. Accuracy at low signal levels would be improved by balancing offsets of amplifiers A, and A4. Ii 330p Using eq. 7.1 the collector current of is determined by R, 2k2 A2 1741CG R5 - E' log, = VEB4 = VEB3+eol T o Ic4 44 e2 15V R7 R6 3k3 1k -15V where 1k R8 R7+ R8 (7.6) and Tr3 2N3707 IC3 VFB3 = -Eo log, olc3 Io Substituting for VE84, VEB3 and e', in 7 100k 2k2 100p eq. 7.6 gives Eo log lo Ic3+ Tr4 2N3707 IC4 R4 10k +15V R3 3 +15V 7 A4 R8 R7+R8 1741CG R5+R6E lo o R6 Icl 42 4 glc2lol -15V -15V E' log Ic4 Io4 If all transistors are at the same tempera- 12 3 3 12k VEB4 R2 ----vV --A 20 0.75 10 040 0.0 U28 U37 17191 2.10 0.76 U404 010 U801 118 UABC80 0.40 17AF42 045 UBC41 0.50 UBF80 040 17BF89 046 UCC85 0.40 7485 7488 7484 7488 7490 0-0s 020 040 020 .. .. .. 7491AN :: . . . .. .. 010 UU1142 UCH81 240 285 UCL82 UCLBS 00 UF41 040 UF89 240 UL41 265 UL84 0.40 UY41 248 UY85 240 VP4B 1.266 VR75/30 0.46 VH105/30 0.88 VR150/30 185 NKT218 OA70 046 0A30 0A47 118 0A71 NKT301 0.04 NKT304 0.76 NKT401 0.87 Ó078Ó 80 087 100 0.90 0.46 0.76 1-00 OAS OA79 0A81 0A86 0A86 5YSGT0.40 5240 040 00 6/30L2 8AL6 010 6AQ6 048 6AU6 6AV6 6BA6 285 005 025 280 025 61487 OATS 0.80 075 060 0.76 0.420 007 0A202 0.10 0A210 025 0A211 040 0.66 NKT7130.86 0A5 0.20 0A6 0A7 046 5V40 045 5174G MHO 6BJ6 NKT40 NKT404 5R4GY 0.75 813E6 040 040 1145 040 085 048 1T4 384 3V4 1.86 046 Y63 NKT211 0.26 NKT213 0.26 NKT214046 NKT216 0.87 NKT217 CV404 CV415 CV416 CV417 CV428 CV434 CV447 CV449 CV466 CV469 CV488 CV491 CV492 CV493 CV717 CV808 CV1072 CV1076 CV1092 CV1S19 CV1343 CV1475 CV1476 CV1477 CV132 CV133 CV135 9002 9003 9004 9006 9006 13201A .. 8P61 C17397 CVlßl 9001 .. 81741 CV390 CV220 CV281 CV273 CV284 CV286 CV287 CV315 CV329 CV937 CV342 CV345 CV354 CV359 CV360 CV371 CV372 CV378 CV391 CV395 BIC lE 607 : 042 A1ö84 A2087 A2134 A2298 A2426 A2521 A2900 ACTS 601 :ó 0.87 0.87 8021 6057 6058 6059 6060 2050 2050W 2051 4003A 4212D or E 4242A 43130 4328A 4687 5544 5545 5642 5644 5651 5670 5672 5676 5687 5696 5702 5718 5719 5725/ 6A86W 5726/ OAL6W 5727/ 2D21W 5749 6760 5751 6802 5814 5823 6840 5963 5985 6005/ 7437 006 018 PY50 1.00 PY800 040 PY01 060 NKT1280 11.8100A0-20 CV2155118 046 017 Lohndon ,SW626S6AWeo1Ifse7d2Ro4ad, P r ö'1 PY83 246 T41 046 U25 PL802 0.96 PCF8080.86 CV253 BYZ880 eerir.e0.15 CR81/05 7470 PLBS 055 226 PL50 0.0 PL504 0.0 PCF8020.0 PL608 040 PCF050.0 PL509 110 PCF080.70 PL01 0.0 0171119 BY100 01.6 0 42 0.48 0.48 PCC189066 CBIOB 8.13 CV102 0.18 100B.275 048 080 040 PL36 PL38 PL81 PL82 050 BTY79/ 744IA Pi 7442 .. 7450 .. 7451 .. 7458 7454 .. 7480 0 80 00 20 KT88 : 0 4E 016 PL84 0234 74S: 7440 ó s°s PD600 110 PEN45DD PCF80 040 PCF86 0.0 PCF8010460 00 GY501 OZIO 040 GZ32 0.48 954 955 956 957 1625 328 329 OBZB 0-40 285 H63 HL41DD 0.68 HN309 140 KT01 1.76 KT66 245 KT81 (7C5) 075 891ß 15003 15004 0.88 024 OB2 PFL20066 889R 100TH 150B2 150B3 15001 0A2 PC86 PC88 0.0 PC900 0.48 PCC84 040 PCC89 040 FW4/500 01.7 95,31 3V/390B 4-125A 047 029 045 CR81/40 0.47 040 225 225 016 286 9000 9000 160C2 EZO BY126 BY127 9001 6BL7oTA E781 0.66 OAG OAV 6BA8A 6BK4 6BK7A 3V/30A 2C43 86A1 WAS 6AX50T 6B40 3.7/170E 2A816 2C26A 2C34 2C39A 6A135 6AV6GTA 6AW8A 3J/10E SAS 831(1 OAUO 3J/121E 1N23B 1N23CR 1X2A 1X2B 6AN8 6AU4GTA 6AU5GT 3C45 11421B 6A116 BANS BD121 BD123 BF115 BF173 BF180 BF181 BF194 76B1 7501 6486 3C24/240 1B35A 1B63A 1E21 BC107 210 BC108 210 BC109 210 BC116 0.20 BC118 046 BC117 040 BC169C0.16 BCY34 040 6D149 050 ADM 087 AD182 037 417114 025 AF115 045 3C22 3023 11324 AF212 100 ACY17 0.80 AD140 040 VALVES 1B3GT 00 045 040 040 046 AC388 046 23424441.91 2E2646 045 2E2926 210 2N3702 010 2N3703 0.10 2N3704 012 2N3705 010 2N3707 0.12 20302 222 028 A0127 AC128 A0176 A0187 2N1307025 2N2147076 2N2218040 20220 0.68 146 045 085 040 2N3819086 2N4286015 2314289 015 2371306 0.26 218 113132 0415 2N708 0.16 0.66 EMS 2N19020.18 2N13080.18 1N401007 045 ELM AF117 045 AF139 040 ECF80 036 020 0.25 2N9710 010 2E3711 0.10 0.83 ECCBá 0 40 ECC88 040 0-17 12423 BIM 040 246 00 045 EL37 EL41 EL42 EL84 EL91 0.0 EZöO 1.76 0.38 0.85 EC089 030 TRANSISTORS 13421 EL33 EL360 140 ELL80 100 B13180 0.46 EM81 0.0 EM84 046 EY51 040 EY86 040 EZ40 0.0 E241 0.46 0 33 EHO 040 145 140 EF37A EF39 EF41 EF52 EF80 EF86 EF86 EF89 EF91 ECC40 100 ECC81 0,36 ECC82 0 30 045 DM70 DY86 DY87 EF98 076 EF183 080 EF184 086 ECF82 040 ECHOS 1.00 ECH42 276 E01381 040 ECHOS 0.46 ECH84 045 ECL80 0.45 ECL82 285 ECL86 240 EOLL800 VALVES AZ31 AZ41 a55 012 0.16 210 225 210 0.10 01.0 0.10 0.08 012 0.16 OAO 008 0A91 007 CYl47ö OAZ2100.82 0Á22110.82 0AZ242023 OA2244042 0AZ248048 0C16 000 0C18T 048 0C19 0.87 OCSO 0.85 0022 0C23 0C24 CV401S CV4019 CV4014 CV4015 CV4016 CV4017 CV1833 CV4018 CV4019 CV4020 CV4022 CV4023 CV4024 CV4025 CV4028 0V4033 CV4035 CV4038 CV4039 CV4040 CV4043 CV4044 0V4046 CV4053 CV4058 CV4059 CV4060 CV4083 CV4079 CV4501 CV4502 CV4503 OV1480 CV1481 CV1482 CV1832 CV1835 CV1994 0V200 CV2131 0V2164 0V2156 CV2160 CV2179 CV2235 CV2237 CV2238 CV2253 CV2289 CV2325 CV2361 CV2466 CV2616 CV2519 CV2520 CV2522 CVS7S1 CV2901 CV3623 CV3929 CV3986 CV3988 003991 003998 CV4514 CV4507 CV4508 CV4001 CV4002 CV604 004008 004004 004005 CV8008 CV6045 DA41 DA100 0V4006 DET71 E56L CV4007 CV4008 CV4009 CV4010 CV4011 74111 74118 74119 74121 74122 74123 74141 74146 0.122020.42 0025 CV1479 74107 6BQ7A 0.46 EBOCC EOFC w80F 060 0.0 0 037 0 6BR7 0 90 6BW6 0 85 6BW7 080 088 145 010 110 6C4 60D6111 6CH8 6E5 0.86 61713 6J60T 0.80 6J7GT 046 0.0 BKBGT 6K7GT 286 6K80T 040 6P25 1.76 6Q7GT 043 880700 0-40 68J70T0-80 60L76T0.86 88N7OT 6174GT0 0028 0029 OCSO 0C96 0C36 0C41 0C42 0C43 0C44 0044M 0C45 0045M 0C46 0057 0058 0059 0066 0070 0.86 0 7405 .. :: .. 040 040 040 7427 .. . .. . . 7472 .. 7473 .. 7474 .. 7475 .. . 0ßb 0 30 0 40 017 0.17 0.12 0.18 . .. . .. . 100 1.90 00 1.86 270 s THROUGHOUT THE USED WORLD. SANWA S EXPERIENCE OF 30 YEARS ENSURES ACCURACY. RELIABILITY, VERSATILITY. UNSURPASSED TESTER PERFORMANCE COMES WITH EVERY SANWA 6 Months' Guarantee Model P-2 -B £5.77 Model JP -50 £6.93 Model 380 -VTR £9.79 Model U -50DX £9.90 Model A- 303TRD £13.03 MODEL U -50DX Model K -30THD Model F -80TRD £14.90 £16.22 Excellent Repair Servira Model AT-45 Model 380-CE Model N -101 Model 460 -ED Model EM -700 Model R 1000CB £18.64 £19.92 £22.00 £25.74 £50.56 £65.17 . . . . . 015 00169 020 0C170 045 0.40 0079 040 228 OC81 0.20 007813 0.20 0081D 020 0081M 0.20 EOT 0.26 G180/2M O240/2D OCfl3 0400/1K E810C E81L 0374 OT1C GTE175M GT13120W E82CC E8300 E83F GTß150M/8 GUIS BOSCO E900C GU20/21 OU60 0%171 GXUS E9OL E91H E920C E180CC ElBOF E181CC E182CC GXU3 G11J4 OX1760 KM E188F E18800 KT67 KT88 EA50 EA52 EA78 M8079 118080 318081 ECC35 ECF04 5(8082 EMS EF54 EF65 EF804 218083 M8091 M8096 M80S7 M8098 M8100 M8136 M8197 M8140 EFPOO EN30 EN31 EN32 EN91 E8U74 E8U78 E6II77 218141 208142 M8144 M8149 176057 F6960 F6061 F6063 118157 308161 M8162 M8163 318167 5(8179 318190 M8196 M8204 FX219 F%226 FX227 01/371K 0120/1B 0150/2B 7417Ó 74174 74175 74176 74190 74191 74192 74193 74194 :: 4.10 .. .. 140 .. .. .. .. .. .. .. .. .. 20 1.86 060 1 30FL14046 SAPI OC123 0.30 0.80 0.26 0 55 080 040 0C202 040 00203 040 0C171 0C200 00201 0.70 0C204 0.40 OC205 0.75 OC206 0.90 00207 090 OCP70 0.42 OCP71 0.97 ORP12 0.0 318212 218214 M8223 M8224 218225 118232 M8237 M8245 4 00 3BP1 3DP1 3 345 SFP7 1 SOPS 5CP1 0V960 6.0 0 5FP7 200 881) 1000 0V4291710 VCß188700 ORP61 042 8%640 040 0X642 280 270 015 610643 2831 2822 28170 28178 28271 0445 01.0 0.40 218 ZT21 0.26 ZTX107016 ZT%100.12 2T7(90012 ZT%304025 ZT%500.18 ZT%5030.17 ZTX6310416 Q87á/60 Q889/E Q595/10 Q896/10 Qß106/45 Q13108/46 Q8160/15 Q8160/30 Q8150/36 Q8150/40 Q8150/45 ME1400 ME1401 ME1403 ME1404 ME1500 Q810/80 Q8120 31E1501 OAS Q81202 Q81203 023 5 Q8U1 0A40 ORS OB3 OD3 QVO3-12 QV04-7 0Z4 024A PT15 QV08-20 QY31.25A QY4-250A QY4-400A QV0546 003 QA2400 QA2403 QAS404 QA2496 QA2407 MO R17 14l8 8190 8130P 8TV20/40 817280/80 Q133/900 QB3-5-750 QB4-1100 QF41 QF45 QQV02-6 QQV03.10 QQV03-20 QQV09-20A QQV04-15 QQV96-40 QQV06-40A QQV07-40 Q870/20 0U41 11U42 TD08-10 TT15 TT21 TTBE1M11 T240 1717 U19 U27 VL0891 290T Q1375/20 2759 Q875/40 280307 LOW PROFILE SOCKETS 14 ple DIM, 16v. 16 pie, DIL, 17p. 200 Stockists of English 1'85 M.O. Valve Co Mullard, S.T.C. 2'S0 100 110 60 2 50 4 6 00 5BP1 1.96 1.96 20 0 2 60 9E01 045 0C139 045 0C140 0.86 0C141 0.0 060 6146 1 TUBES 1CP31 7 00 0.86 9OFL1 0.76 30175 020 0082 0.26 0082D 040 . ó eó0o 1.95 0072 0073 0074 0075 0076 0077 0078 0.66 EBOL 00 276 30L15 046 040 30L17 0.80 226 30P12 00 7Y4 065 30P19 086 12AC6 060 30PL1 0.75 12A176 056 30PL190.98 12AE6 045 30PL14000 I2AT6 040 35L60T00 12AT7 0.35 85W4 006 12AU6 0.86 3528 070 12ÁU7 0.80 35Z4GT0.0 12AX7 280 5006 0.60 12BA6 040 500DOG 12BE6 240 140 218 0.0 0.0 00812 0.40 012 80 0.80 807 0.90 8080 30C17 30C18 7H7 787 OCBIDM 0.60 12B137 0 46 SOC15 7C6 0.87 . .... ?i'I4iTA psi 50 0 60 1.00 7492 .. . 016 .. 1.0 7493 .. 0.76 74195 7494 .. 00 74150 386 .. 0.80 .. 0.80 7416I 130 74196 .. 0.80 7496 7406 .. .. 0.60 7428 .. 280 200 74197 ,. 7496 .. 1 0 74164 7407 .. 040 .. 0.20 080 7430 .. 625 74155 .. 145 74198 .. 7497 7408 .. .. 0.42 0.40 7432 .. .. 040 .. 74166 .. 1 56 74199 .. 0.56 74100 240 7409 .. .. 0.45 7438 .. .. 070 SEND Sp FOR LIST OF 6,000 TYPES VALVES AND TRANSISTORS Terms of Business: Mon. to Sat. Open to callers 9 a.m. to S p.m. Closed Sat. I p.m. to 3 p.m. Express postage Sp. for Express postage: Ip. for each transistor, over lo post free. All orders over £5 post free. Valves tested and released 7404 .. 45 0 60 0 80 0 40 6U50 110 6V6GT 240 6X4 286 6%5GT 040 7B6 270 7B7 0.50 7C5 1.18 R.S.T. Electric, i, F , 4.60 4.80 one valve; Ip. each additional valve to A.R.B. specification if required. contact maintenance problems? call in the trouble shooters! Complete technical advisory service available - and data on all Electrolube contact treatments, fine lubricants and maintenance chemicals. Phone or write. Cases extra. available for most meters. but not sold separately. Please write for illustrated leaflet of these and other specialised Sanwa meters SOLE IMPORTERS IN UK. - QUALITY ELECTRONICS LTD. 47-49 HIGH STREET,KINGSTON-UPON- THAMES,SURREY. KT11LP Tel:01 -546 4585 WW-095 FOR FURTHER DETAILS ELECTRD[UßE Electrolube Ltd. Slough, Bucks, England. Tel Slough (STD 0753) 25574 WW-096 FOR FURTHER DETAILS www.americanradiohistory.com : Wireless World, February 1973 a56 COUNTERS. 4 digit (non reset) 24 or 48v. (state which) 4 x 1 x 1 In. 35p. P.P. 5p. 5 digit (non reset) 8v. d.c. (2; x 10 x 11 in.). 75p. P.P. 5p. 3 digit (Reset) 48v. 4x 1 x 1 in. £1.75. P.P. 5p. 5 digit (Reset) 12v. d.c. (2} x 2 x 1 In.). £3. P.P. 5p. 6 digit (Reset) 12e. d.c. (2} x 2 x 1 in.) £3.50. P.P. 5p. COPPER LAMINATE P.C. BOARD 84 x 5} 11 x x1/16 81x 1 /16 11x8x1/16in In. 12 }p sheet, 5 for 50p In. 15p sheet, 4 for 50p 20p sheet, 3 for 50p Offcut pack (smallest 4 x 2 In.) 60p 300 sq. P &P single sheet 4p. Bargain packs 10p In. 1245. .M.I. P.P. 155. 20 watt (13x8 In.) with single tweeter and Hz. Ceramic magnet 11,000gss. £8. P.P. 40p. 20 watt base unit only. LS. 40P. P.P. CABINETS for 13 x 8 In. speakers manufactured in } in. teak -finished blockboard. Size 14 x 101 x 9 In. 16 ea. P.P. 40p. 20W. CABINET. 18 x 11 x 10 in. f8. P.P. 50p. PRECISION A.C. MILLIVOLTMETER (Solartron) 1.5m.v. 60db to 20db. 9 ranges. Excellent condition. £22.50. P.P. £1.50. V.H.F. POWER TRANSISTORS TYPE PT4176D (2N4128). 24 watt 175 MHz. £1.50 ea. S.A.E. for spec MINIATURE UNISELECTORS (A.E.I. 2203A.), 3 bank, 12 position, non -bridging wipers. £425 ea. Brand new Complete with base. to 15v: TEN TURN POTENTIOMETERS (Colvern) 5000 ohm £1.50 complete with 1 OT dial. VACUUM PUMPS (Metrovac GS 24). Complete with h.p. 240v. A.C. motor. New condition. £35. (S.A.E I Literature.) pole 15 way 2 bank. (G.P. contacts and wipers). £1 .25 ea. B Resistors /Capacitors. All types and values. All new modern components. Over 500 pieces E2. (Trial order 100pcs. 50p.) We are confident you will re -order ULK COMPONENT OFFER. ERCO WIRE -WOUND POTS. New Individually boxed. 200 ohm 25 watt 50p: 725 ohm 50 watt 76p: 300 ohm 100 watt £1 ea. In, £5.75 ea. (ELECTRONICS) LTD. 9 á 10 CHAPEL ST., LONDON, N.W.I 01- 262 -5125 01- 723 -7851 4A 4-16 -24 -32 4- 18-24 -32 4-16 -24-32 4- 16 -24 -32 26 -30-35 25 -30-35 25 -30-35 25-30 -35 12-20-24 12-20-24 12 -20-24 12 -20-24 3 -12 -18 5B 3 -12 -18 SC 3 -12 -18 2C 20 3B 3C 3D 3E 4A 48 IC 5D 50 OA OB 7A 7B 7C 7D 8A 9A 10A 11A 12A 13A .. .. .. .. .. .. .. .. .. .. 48-56 -60 /8 -56-00 6-12 .. 8-12 .. 6-12 .. 6-12 .. 12-24.. 17 -32.. 9-15 .. 8.3 30- E7.75 12 8 4 2 20 10 5 £0.50 E3.10 £2.75 812.00 L7-00 85.75 8325 2 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 3 -12 -18 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 2525 -30 1212 .. L13`00 1.00 85.75 £4.00 30 .. .. .. 20 10 5 30 20 10 S .. .. .. £1250 £1-SO 2 15 2 8 £3.75 £3 -90 1 8 top 45p 45p 75p 50p Sop SOP £3.75 £2.50 £1.75 L6-50 81.50 .. .. .. 55p 45p 45p £2.75 1 50 20 10 5 30p £775 L3/0 2 45p 45p 40p L10-SO 84.75 £3.75 £375 45p 40p 40p 35p 55p 45p 35p 35p 35p 35p 35p 35p 35p 35p Note: By using the Intermediate taps many other voltages can be obtained. Example: No. 1 No. No. 2 5 .. .. .. 7-8-10-15-17-25-33-40-50v. 4-8- 12-16- 20- 24 -32v. 3-t -9-12- 15 -18v. UNSHROUD TERMINAL Primaries, 240v. Size Type A H 5 x 41 x Size 8-12 e 12 -0-12 C D 9-17 24 CONNECTIONS. BLOCK 15 8 10 8 All Price Carr. L4.00 45p £4.00 45p 45p 45p £400 £4.00 New/Boxed. £6. 50p. RATCHET RELAYS. (310 ohm) Various STEP DOWN 2401110v. AUTO TRANSFORMERS FOR AMERICAN EQUIPMENT. Fitted with 2 or 3 pin American sockets. All sizes from 80 to 21kva. available. Send s.a.e. for list. American sockets, plugs, adaptors also available. 1 } UNISELECTORS (Brand new) 25 -way 75 ohm. 8 bank } wipe £3.28. 10 bank } wipe £3.75. Other types from £2.26. TRANSFORMERS £175. 1 Housing dia. 3} In. Air outlet 10 x 1 In. £2.25. P.P. 25p. Type 2: Housing dia. 6 In. Air outlet 20 x 2} In. £4. P.P. 50p. Both types 115/ 240v. A.C. (brand new). POT CORES LA1 /LA2 /LA3 50p each BLOWER FANS (Snail type) Type P P. 50p 750W f6. SIEMENS /VARLEY PLUG -IN. Complete with transparent dust covers and bases. 2 pole c/o contacts 36p ea ; 6 make contacts 40p ea.; 4 pole c/o contacts 50p ea. 6 -12 -24 -48v types In stock. 12 VOLT H.D. RELAYS (3x2)4 1 in.) with 10 amp. silver contacts 2 pole c/o 40p ea.; 2 pole 3 way 40p. P.P. 5p 24 VOLT H.D. RELAYS (2x2x} In.) 10 amp. contacts. 4 pole c /o. 40p ea. P.P. 5p. 240v. A.C. RELAYS. (Plug -in type). 3 change -over 10 amp contacts. 715p (with base). P.P. 5p. SUB -MINIATURE REED RELAYS (1 in. x } in.) Wt } oz. 1 amp. 200 P.I.V. 2 amp. 60p. (Ix }x f in.) 30p. CIRCUIT BREAKERS (3 pole) 15 amp. Dorman B Long 'Loadmasters' f1.50. P.P. 25p. ft. P.P.£1. PATTRICK & KINNIE E.M.T. TRANSFORMER. HEAVY DUTY 0/110/240v. Sec. 1800v. 3.1 K.V.A. f28. 191 LONDON ROAD Prim Carr. £2 4K.V.A. Type 1. Sec. 630- 0 -620v. 105m /a 5v. 4A. 5v. 2A. Potted type £3.00, Carr. 50p. Type 2. Sec. 1,875v. 80m/e. 42kv. wkg. and 500v. 31m/a. Potted type E350. Carr. SOp. Type 3. Sec. 310 -0.310v. 35m /a and 200-0200v 20m/a. 6.3v, 1A. 33v. 1A. Potted Type ype 12.75. 4. Sec. leppedl 0m.1P.83p :1 220 -240v. Type 1.. un120m /a. 690.710-0. 710 -eeov. shrouded table top connections, tropicsllaed £250. P.P. 50p. Type 2. Sec. lags. 60m/a. 6.3v. 3a. £125. P.P 25p. Type 3. Sec. tapped 150 -165v. 4 amps unshrouded table top connections 4375. P.P. 75p. Type 4. Sec. 130v. 450m/e. three times. core table top connections E3.50 P.P. SOp. rfype 5. 63v. 1-ea. and 24v. 0.8e. and 0-3v. le. unshrouded fable top connections £2.S0. Carr. 50p. GARDNERS. All primaries 220 -240v. 1. 350 -0.350v. 60m /e. 6-3v. 4e. 5v. 2.5e, shrouded E150. P.P. 30p. Type 2. 300 -0-300v. 60m/a. 6.3v. 45. 'C' core. £1.50. P.P. 30p. Type 3. 450- 400-350-0350-400 -450v. 50m /a. 'C' core L125. P.P. 25p. Type 4. 250 -0-250v. 100mla. 8.30. 3e. 8.3e. 3e. 5v. 3a.. Potted type £2.50. P.P. 50p. Type 5. 350v. 44m /e. 20v. 10m/e. 5.3v. 3e. 'C' core £1.50. P.P. 30p. L.T. SMOOTHING CHOKES GRESHAM 'C' core swinging types. 7.5 m/h. 6e -75 m/n 0 5e. Et 50 carr. 50p. 10 m /h. 4e -100 roln 0-5s. L3.00 carr. 50p. G.E.C. 150 mlh. 3a. unshrouded fully troplcallsed £2 75 P.P. 35p. REDCLIFFE. OIIFllled types 100 mlh. 2e. E2 50 P.P. 45p. 130 mlh.1.5a. EtSO P.P. 25p Mains filter chokes 10 mlh. 2a. SOp. P.P. 20p. All above chokes 1-1 ohm res. WODEN. 'C' core. 50 mlh. 25e. E1-SO P.P. 25p. 10 m /h. 7.75. E1-SO P.P. 25p. 15 m/h. 338e. LIN P.P. 25p. H.T. SMOOTHING CHOKES PARMEKO. Potted Type. 10h. 180 m /a. £1 -SO P.P. 25p. 15h. 300 milt. £2 -S0 P.P. Sop. 10h. 120 mie. Op. P.P. 20p. 15h. 75 m /a., 10h. 75 mle., 50h. 25 mie., SOp. P.P. 20p. Swinging Type. 34h. 80 m /a. /70h. 35 m /a. 2.8KV, D.C. wkg. asp. P.P. 35p. M.T. TRANSFORMERS PARMEKO. Prl. 240v. Sec. 250.0 250v. 50 m /a. 6.3v. la. E1.25. P.P. 35p., size REDCLIFFE L.T. TRANSFORMERS 'C' CORE TYPE All primaries. 220 -240v. Type 1. 12 -0-12v. 4e. £275. P.P. 35p. Type 2. 11v. 9a. £2.50. P.P. 35p. Type 3. 24v. 3a. £2.00. P.P. 35p. Type 4. 25 -0-15v. 154m /a and 7v. 1.355. £125. P.P. 25p. Type 5. 38v. 350m/a. 75p. P.P. 25p. Type 6. 55- 0 -55v. 150m /e. and 5.3v. 12a. 81.50. P.P. 25p. Type 7. 28-8-028-8v. 150m/a. £125. P.P. 25p. Type 8. 11.0.11v. 176m/a. 50p. P.P. 20p. Type 9. 63v. 600m/a. £1.00. P.P. 25p. Type 10. Tapped 370 -390 -400v. emla. SOp. P.P. 20p. Type 11. 400v. 25mIa. and 25v. 25m /a. Lí.00. P.P. 25p. Type 12. 28v. 2.5a. £1.50. P.P. 25p. 83.68 -74v. 3e. and 6v. 4e., terminal block connections, unshrouded £250. P.P. 50p. Type 2. Tapped 59- 61- 65- 67 -69v. 10e. T. block connections, unshrouded, tr plcalked £5.50. Carr. 75p. Type 3. Tapped 56- 58 -60v. 3e. T. block connections, unshrouded, troplcallsed £275. P.P. 50p. Type 4. 100-0-100v. 65m/a. and 61-64 -67v. 150m /a. and 8v. la. Type 5. Tapped 37-40430. 5a. and 105v. 300 m/a. Twice 'C' core enclosed type L6-50. Carr. 75p. Type 6. 39v. 8-6e. and 38v. 2.65. 'C' core enclosed type EON. Type 7. 27v. 9a. and 9v. 9a. and 3v. 9a. £400. P.P. 50p. Type 8. Tapped 30-57-115v. O-Sv. 0.5a. 'C' core L2-00. P.P. 35p. 4 x 3 x 2 } Ins. GARDNERS. 'C' core. Prl. Type 240v. Sec. 300- 0 -300v. 68 mie. 6.3v, 4e. El 50. P.P. 35p., size A.C.I. Prl. 240v. Sec. 250v. 00 mie. 15v. 12e. 0.3v. 4.Sa. El 25. P.P. 35p., open type table top connections. Size 4 x 31 x Sins. ADVANCE L.V. CIV TRANSFORMERS INPUT 154.260V Sec. 28v. 8e. open frame type. L1.7ß carr. E1. 4v. 3 watts E1.25 P.P. 25p. 12v. catte 8225 P.P. 40p. 0v. 25 watts open frame type E2 00 P.P. 40p. Astrolux Input 190-260v. enclosed type, output 240v. 30 watts, £2.00 carr. 50p. 75 G.P.O. RELAYS 25 amp make Type. 10002 normal contact 60p. 2000 + 130£2 3000 1 1 CO normal CO 40p. 750 3M. 18. contacts 40p. P.P. on all relays 10p. 1 BERCO INST POTS 200G 10 watts 3) Ins. dia. SOp. P.P. 10p TCC. BLOCK CAPACITORS mfd. 4.5Kv DC wkg. Size 13 x 11 x ins. 83.00. Carr. 75p. 0.5 mfd. 10Kv DC wkg. Size 11 x 5 x 3} Ins. £2.50. P.P. 50p. G.E. 6 mfd. 1000v. DC wkg. 50p. P.P. 15p. 4 mfd. 1000v. wkg. 40p. P.P. 15e. 15 mid. 330v. AC wkg. 50p. 4 51 P.P. 15p. TUBULAR 40 7-5 6 15 PAPER mfd. 150v. DC wkg. mfd. 250v. wkg. AC mid. 440v. wkg. AC mfd. 250v. AC wkg. SCOTCH CAPACITORS MAGNETIC TAPE 35p. 35p. 50p. 50p. P.P. P.P. P.P. P.P. 100. 10p. 10p. 10p. COMPUTER Type 3M458 } in. 3,600 feet. Supplied new In maker's cartons. At a fraction of maker's price. £3.75. P.P. 25p. www.americanradiohistory.com ROMFORD ESSEX RM7 9DD ROMFORD 44473 model £33. Carr £2. Sec. make 3/12v. 40p. ea. 1 SILICON BRIDGES. 100 P.I.V. L.T. TRANSFORMER. Prim. 110/240v. Sec. 0/24/40v. 1.5A. (Shrouded type). £1.50. P.P. 25p. HT /LT TRANSFORMER Prim. 240v. (tapped) Sec. 1 500- 0 -500v. 150 m /a. Sec. 2 31v. 5 amp. £2.75 P.P. 50p. : RELAYS P.P. 25p. L.T. TRANSFORMER. Prim 220/240v. Sec. 13v. 1.5 amp. 85p. P.P. 15p. L.T. TRANFORMER. Prim. 115/240v. Sec. 10.5v. at 1 amp. c.t 28- 0 -28v. at 2 amp. shrouded type. £2. P. P.40p 2500 watt. ISOLATION TRANSFORMER (CONSTANT VOLTAGE). Prim. 190 -260v. 50Hz. Sec. 230v. at 10.9 amps. £30. Carr. £2. H.D. STEP -DOWN TRANSFORMER. Prim.200 /240v Sec. 117v at 19.8 amps. (2,300 watt). £2250. Carr. £2. H.T. TRANSFORMERS. Prim. 200/240v. Sec. 300- 0 -300v. 80 m.a. 6.3v. c.t. 2 amp. £1.50 P.P. 40p. 350- 0 -350v. 60 m.a. 6.3v. c.t. 2 amp. f1. P.P. 25p. STEP -DOWN TRANSFORMERS: Prim. 22/240v. Sec. 115v. Double wound 500w. £6. P.P. £1. 700w. (with filters) £10. P P. £1. 500w. (metal cased with socket output) and overload protection. £6.60. P.P. 25p. 300W. £1.50. AUTO -WOUND. 75W. G.E.C. L.T. TRANSFORMERS All primaries. 220 -240v. Type 1. Tapped 311n. Amps £1 ea. RELAYS (G.P.O. '3000'). All types. Brand new from 37 }p ea. 10 up quotations only. EXTENSION TELEPHONES (Type 706) L.T. TRANSFORMER. (Shrouded) Prim. 200/250v. Sec. 20/40/60v. 2 amp. £2 ea. P.P. 40p. L.T. TRANSFORMER (CONSTANT VOLTAGE). Prim. 200/240v. Sec. 1. 50v. at 2 amp. Sec. 2. 50v. at 100 m/a £3. P.P. 50p. L.T. TRANSFORMER. Prim. 240v. Sec. 0/25/50v. WODEN. All primaries CURRENT RANGE OF BRAND NEW L.T. FORMERS. FULLY SHROUDED (*excepted) TERMINAL B LOCK CONNECTIONS. ALL PRIMARIES 2201240v. Carr' Price Amps Sec. Taps No. 655 E12.00 15 .. ,. 25- 33-40 -50.. 1A 505 Ea -00 10 25- 33- 40 -50.. 1B 50p L750 a .. IC 25- 33-40 -50.. 40p £5.50 3 .. 11) 25- 33 -40 -50.. x2 x P.P. 25p. H.T. TRANSFORMERS BY FAMOUS MANUFACTURERS PARMEKO. All primaries 220 -240v. 2A 25 24 core (24 colours) 20p. yd. 100 yds. £17.50. 30 core (15 colours) 22 1p. yd. 100 yds. £18.50. 34 core (17 colours) 25p. yd. 100 yds. £20. Minimum order 10 yds. TELEPHONE DIALS (New) LIGHT DIMMERS (2000 watt) Trlac Controlled. 30 2 amp. 1 12 core (12 colours) 16p. yd. 100 yds. £12.50. Types 85p. P.P. 5p. 'X- over' 20 Hz to 20,000 PAINTON WINKLER SWITCHES. £1250. 2,200µf. 100v. (11. x 41n.) 60p. 3,150µf. 40v. (11 x 41n.) 80p. 10,000µf. 25v. (1} x 4 }in.) 60p. 10,000µf. 100v. (2} x 4 1In.) £1. 12,000µf. 40v. (2 x 4in.) 75p. 16,000µf. 16v. (2 x 41n.) 80p. 21,000µf. 40v. (2} x 41n.) £1. Post and packing 5p. E core (6 colours) 3 screened, 14/0048. 15p. yd. 100 yds. 6 HIGH CAPACITY ELECTROLYTICS PEAKERS AND CABINETS .M.I. 13 x 8 In. (10 watt) with two tweeters and crossover 3/8/15 ohm models. £3.75. P.P. 25p. E .M.I. 13x 8 In. base units (10 watt) 3/8/15 ohm models £2.25. P.P. 25p. E .M.I. 80 In. rnd. 10 watt Woofers. 8 ohm.1 3,000 gss S E PRECISION CAPACITANCE JIGS. Beautifully made with Moore r, Wright Micrometer Gauge. Type 1. 18.5pf. to , r 1,220pf Elf each 9.5pf.to 11.5pf. £5 each. MULTICORE CABLE (P V C.). HIGH -SPEED MAGNETIC E LECTRONIC ORGAN DIVIDER BOARDS built to high industrial /computer spec. 5 octave set £16. Complete with connection data and oscillator details. SPECIAL OFFER OF MULTI L.T. TRANSFORMERS VERY CONSERVATIVELY RATED Gresham Pri. 200- 220 -240v. Sec. 29.5v. 2 -ea. twice. 20v. Sa. twice. 15v. 0 -la. four times. 'C' Core. Table Top connections carr. 75p. Pri. 200- 220 -240v. Sec. 10.3v. ta. twice. la. twice. 225.25.28.8v. 5e., 20 -Sv. LO SO. 10v. -Sa., 23.0v. 1e., 200 mitt 'C' Core. 2 0-3v. 2e., 145-0-145v. Table top connections £4 -S0, carr. Sop. Prl. 200- 220 -240v. Sec. 20- 21- 22- 23- 24 -25v. ea., 20-21-22-23- 24.25v. 3.5e., 18- 10.20.2122-23v. 2e., 11.12- 13- 14- 15-18v. 0.5a. twice 100- 0-100v. 150 mie 'C' Core. T. Top connections. LI30 carr. 75p. Pri. 200-220-240v. Sec. tapped 03-08.74v. 3e. and 0v. 4e. Open trame terminal block connections Li 50 P.P. Sop. Prl. 200- 220-240e. Sec. 37-40 -43v. 5a., 105v. 300 m/a. twice. Oli filled potted type. E11.00 carr. 75p. Prl. 200 -220 -240v. Sec. 30v. 8-0e., 38v. 2-0e. OIIFlIled potted type. ES-50. carr. 75p. Prl. 200- 220-240v. Sec. tapped 30-S7.5115v. 0-Sa. 'C' Core T. Top Connections. L2.00 P.P. 25p. LTP Prl, 200-220-240v. Sec. 6.3v. 8a. three times. 0.3v. 3e. twice, open frame type T. top connections E3.75 carr. 75p. Woden Prl. 220-240v. Sec. 10v. 2e. fully shrouded LISO P.P. 25p. Prl. 220-240v. Sec. tapped 6-12v. 2e. fully shrouded. EI-75 P.P. 25p. Prl. 200. 220 -240v. Sec. tapped 3- 10 -13v. 7e. Open frame. T. top connections L200 P.P. 35p. Prl. 220 -240v. Sec. 24.5-0- 24.5v. 0.75e. 'C' Core. T. top connections E1.50 PP 25p. Prl. 200- 220-240v. Sec. 11 -0-11v. 176m/a. 'C' core. T. top connections 75p. P.P. 25p. Pd. 220-240v. Sec. 22v. 0.8e. 21v. 0.06a. 'C' core T. top connections 75p P.P. 25p. REDCLIFFE Prl. 200-220 -240v. Sec. 12-0 12v. 4e. 'C' core T. top connections L3 -Se P.P. 400. Prl. 220 -240v. Sec. 24v. 3e. 'C' core T. top connections £2.00 P.P. 35p. Pri. 220-220-240v. Sec. 11v. 95. 'C' core T. top connections £2.50 P.P. 50p. Prl. 200-220-240v. Sec. 25 -0-25v. 154 mie. 7v. l-35e. 'C' core T. top connections L125 P.P. 25p. Pri. 240v. Sec. 14v. 0e. open trame. T. top connections 82.00 P.P. 35p. Prl. 110 -240-440v. Sec. tapped 24.26v. 8a. 6v. la. open trame type 83.50 carr. 50p. G.E.C. Prl. 200-240-240v. Sec. tapped 5961-63 -64 -67 -69v. 10a. Fully tropicalised. Open frame terminal block connections. ESN carr. SOP. Pri. 200 -220 -240v. Sec. tapped 56- 58 -60v. 3e open frame. Terminal block connections. L2 -is F.F. SOP. Wireless World, February 1973 a57 I.L.P. (Electronics) Ltd THE HY41 I LP Power Pack The HY41 supersedes the popular HY40 introduced by ILP last year. This highly improved module achieves true High Fidelity with a dramatic reduction in distortion (typically 0.05% at 1KHz into 8 ohms!) and is electronically and mechanically compatible with the HY40. With this important improvement the HY41 retains all of the quality characteristics found in the earlier version and P.C. board, Resistor, Capacitors, Hardware Mountings and comprehensive manual are included in the basic kit. No further components are required to construct a complete power amplifier of extremely high performance sufficiently versatile to provide power not merely for Hi-Fi but also for public address systems and industry. The free manual gives a full circuit diagram of the HY41 and its various applications including a complete stereo amplifier. Like its predecessor the HY41 is based on conventional and proven circuit techniques developed over recent years. OUTPUT POWER: British Rating 40 WATTS PEAK, 20 watts R.M.S. continuous. LOAD IMPEDANCE: 4 -16 ohms. INPUT IMPEDANCE: 30K ohms at 1KHz. VOLTAGE GAIN: 30db at 1KHz TOTAL HARMONIC DISTORTION: less than 0.15% (typical 0.05 %) at 1KHz. FREQUENCY RESPONSE: 5Hz -50KHz + 1db. SUPPLY VOLTAGE: + 22.5volts D.C. SUPPLY CURRENT: 0.8 amps maximum. PRICE: inc. comprehensive manual, P.C. board, five extra components and MONO: £4.90 STEREO: £9.80 P. & P.:- UNIQUE HYBRID PRE -AMPLIFIER The HY5 has rapidly established a position in the WORLD as the sole hybrid pre -amplifier to contain all feedback and equalization networks within an integrated pre -amplifier circuit. Supplied with the HY5 are two stabilizing capacitors and by the addition of volume, treble and bass potentiometers it is ready for use. Internally the HY5 provides equalization for almost every conceivable input, the desired funcrion is achieved by use of a multi -way switch or by direct interconnection, Two distinctive features of the HY5 are its inbuilt stabilization circuit, allowing it to be run off any unregulated power supply from 16 -25 Volts and a balance circuit which, wher linked by a balance control to a second H i'5, forms a complete stereo pre -amplifier. Specifically and critically designed to meet exacting -li-Fi standards, the HY5 combines extremely low noise with a high overload capability. When used in conjunction with the HY41 and PSU45 forms a completely intergrated system. INPUTS Magnetic Pick-up (within +1db RIAA curve) 2mV. 47K SÈ Tape Replay (external components to suit head). 4mV. 471KSi Microphone (flat) 10mV. 47K Q Ceramic Pick-up (equalized and compensatable) 20- 2000mV. variable. Tuner (flat) 250m',. 100K 1 250mV 47K $Z Auxiliary 2 2 -20mV. 100K ÿz ACTIVE Treble + TONE CONTROLS 12db. (Baxendall) 12db. INTERNAL STABILIZATION Bass + SUPPLY CURRENT 6mA approx. OVERLOAD CAPABILITY Enables the HY5 to share an unregulated supply with the Power Amplifier. SUPPLY VCLTAGE 16 -25 volts PRICE: MONO: £3.60 better than 26db on most sensitive input infinite on tuner and auxl. OUTPUT NOISE VOLTAGE: 0.5mV. STEREO: £7.20 POWER SUPPLY PSU45 The versatile P.S.U.45 is Specification Input: 200 -240 Volts. Output: + 22.5 Volts at Overall Dimensions: L. PRICE: £4.50 inc. P. & designed to supply your HY41's +HY5's in stereo or mono format. 2 amps. 7 '; D. 3.8 '; H. 3.1' P. CROSSLAND HOUSE - NACKINGTON- CANTERBURY °KÈNT CANTERBURY 63218 WW-097 FOR FURTHER DETAILS www.americanradiohistory.com Wireless World, February 1973 a58 The largest selection FULL RANGE ZENER DIODES BRAND NEW FULLY GUARANTEED DEVICES 6.0107 AC113 020 020 AC117% AC122 AC125 AC128 020 012 017 A0115 A0127 AC128 AC132 AC134 AC197 AC141 AC141K AC142 AC142K AC161 AC154 AC155 AC166 AC157 0.28 0.17 0.17 0.17 0P14 014 0.14 0.14 017 0.14 0.17 0.16 0.20 0.20 0.20 024 020 AC186 AC188 020 0.20 ACI67 AC188 024 0.14 AC169 AC178 010 024 A0177 028 AC178 028 AC179 0.17 AC180 40180K 020 AC181 A0181K A0187 AC187K A0188 AC188% ACY17 AOY18 ACY19 ACY20 ACY21 ACY22 AOY27 ACY28 A0229 ACY30 ACY31 ACY34 ACY36 ACY36 AOY40 ACY41 ACY44 AD190 AD140 AD142 AD143 AD149 AD181 017 020 028 0.20 022 020 026 020 0.20 0.20 0.20 0d6 0.18 0:10 0:86 028 0.28 0.21 0.21 028 017 018 086 0:88 048 0:48 0.83 0.60 0.33 0.33 AD162 AD161 & AD182 (MP) 0.66 ADT140 0.60 AF114 0.24 AF116 024 0.24 AF118 AF117 0.24 046 AF118 0.80 AF124 026 AF125 028 AF128 AF127 028 AF139 030 0.60 AF178 0.60 AF179 AF180 0.60 AF181 0.46 AF186 046 AF239 037 016 AL102 0.86 AL103 0.25 ABY26 0.80 A8Y27 0.25 ABY28 026 ASY29 026 A8Y60 ASY61 A8Y52 ASY64 A8Y66 A3Y58 A8Y67 A8Y68 ABZ21 BC107 BC108 BC109 BC113 BC114 BC116 BCI16 BC117 BC118 BC119 BC120 BC125 BC128 B0132 BC134 BC136 BC136 BC137 BC139 BC140 BC141 BC142 BC143 BC146 BC147 KING OF THE PAKS SUPER PAKS 026 026 026 026 025 025 026 0.40 0.09 009 040 010 0.15 01.6 046 216 010 0.80 0.80 0.12 018 012 0.18 0.12 015 016 0.40 0.80 010 010 0.80 0.46 0.10 BC148 BC149 BC160 130161 B0162 BC163 BC164 BC167 BC168 B0169 B0180 BC181 BC167 BC188 BC189 BC170 BC171 BC172 BC173 BC174 BC175 BC177 BC178 BC179 BC180 BC181 B0182 BC182L BC183 BC183L BC184 BC184L BC188 BC187 BC207 BC208 BC209 BC212L BC2131. BC214L BC225 BC228 BCY30 BCY31 BCY32 BCYS3 BCY84 BCY70 BCY71 BCY72 BCZIO BOZA BCZ12 BD121 BD123 BD124 BD181 B0132 BD133 BD136 BD138 210 0.12 018 0.20 017 018 0.80 0.18 0.12 0.12 0.46 0.50 012 0.12 0.12 012 0.14 0.14 0.14 014 022 0.19 0.19 0.19 024 0.24 0.10 010 010 0.10 0.12 012 028 028 041 041 0.12 011 011 044 0.26 0.86 0.24 028 0.80 0.22 026 044 0.18 014 020 026 026 0.60 0.66 0:60 0.50 0.60 0.86 0.40 0.40 0'80 BF188 BF194 BF195 BF196 BF197 0-80 13F200 046 13F282 0.60 0.86 0.56 BD137 BD138 BD139 BD140 BD165 BD175 BD176 BD177 BD178 0 BD180 BD186 BD186 BD187 BD188 BD189 BD190 0'70 BD198 BD197 BD198 BD199 BD200 BD205 0 85 B0179 BDI95 B0208 BD207 BD208 BDY20 BF116 BF117 BF118 BF119 BF121 BF123 BF125 BF127 BF162 BF153 BF164 BF165 BF168 BF157 BRIM BF169 BF180 BF182 BF163 BF164 BF165 BF187 BF173 BF178 BF177 BF178 BF179 BF180 BF181 BF182 BF183 BF384 BF185 45 0-50 0-55 80 0 0.80 085 0.65 0.70 0-85 0-65 0-70 0.70 0.76 0.76 0'85 0 90 90 0.96 0.95 0 80 80 95 0 95 1-00 0 0 024 0.45 0.70 0.70 0.46 0 50 0'46 0'50 0'55 0 45 0.45 0 0 0 70 48 55 0.55 0 60 0'40 0 40 0'40 0 40 0'40 0 22 0.22 0.35 0 35 0B0 0 30 0'30 0 30 0.40 0.40 0ß6 0.30 BF222 BF267 BF268 BF259 BF263 BF270 BF271 BF272 BF273 BF274 BFW10 BFX29 BF%84 BF%86 BFX86 BF187 BF%88 BFY60 BFY51 BFY62 BFY63 BPX26 118E:19 116%20 B81/26 B8Y28 B8Y27 B8Y28 B8229 BBY38 138239 B8Y40 B8Y41 0'40 0 12 0.12 0-14 0.14 0.96 046 015 0E6 0.80 010 0.86 0.86 0.80 027 022 0.80 022 0.24 0.22 020 0.20 020 0.17 0-86 0.16 015 015 016 0.16 0.16 016 018 018 0.28 0.28 138Y96 019 C111E 060 B8295A 0.12 2.00 Bul06 C400 C407 C424 C425 C426 C428 C441 C442 C444 C460 MAT100 MAT101 MAT120 5iAT121 MPF102 MPF104 MPF105 0.80 0.26 0-20 050 0.85 0.20 0 80 0 30 0 36 0.22 0.19 0ß0 0.19 020 0.42 0-37 037 0019 0C20 0C22 0C23 0C24 0025 0C26 0028 0029 0035 0C38 0C41 0C42 0044 0045 0070 0071 0072 0074 0076 0076 0077 0081 OC81D 0082 0082D 0083 0084 00139 00140 00189 00170 00171 00200 00201 00202 0C203 00204 00206 00309 P348A P397 OCP71 ORP12 ORP80 ORP61 8T140 8T141 TI843 UT46 26801 20302 20303 20304 20308 20308 20309 20339 20339A 20344 20345 0.86 0.68 0'88 0,42 0 56 38 0 25 0 0.60 0.50 0.42 0.60 020 024 016 0-12 0.10 010 0.14 014 0.16 0.16 026 0.16 0.16 0.16 0.16 220 020 0.20 0.20 0.26 0.26 0.26 20371 20371B 20373 20374 20377 20378 20381 20382 20401 20414 20417 2N388 2N388A 2N404 2N404A 2N524 2N527 2N598 2Nß99 237696 2:1897 227698 227699 227708 2N708A 2N708 227711 227717 227718 2N718A 227726 227727 026 0.28 028 026 026 086 0.40 0.20 0.42 0-53 0.48 0.40 0.40 012 0.17 0.80 027 0.09 019 0.19 0.24 0.40 0.86 0.86 420 018 0.18 0.18 2N743 2N744 227914 227918 227929 227930 2271181 2271132 2271302 2271303 2271304 2271306 2271806 2271307 2271208 2271309 2271613 2x1711 2271889 2271890 2271893 2272147 2272148 2272180 2272192 2272193 2272194 2272217 2272218 QUALITY TESTED SEMICONDUCTORS Unequalled Value and Quality Pak No. ED Ql 20 Red spot transistors PNP NEW SEMICONDUCTORS Q2 Q3 Q4 Price Q5 0.50 Q6 060 Q7 0.60 Q8 0 60 Q9 16 White spot R.F. translator. PNP 4 00 77 type translators 6 Matched translators 0044/45/81/81D 4 OC 76 transistors 6 OC 72 transistors 4 AC 128 transistors PNP high gain 018 012 017 0.30 0.16 016 0.18 0.80 AND DATA BOOKS ARE NOW AVAILABLE EX. STOCK. SEND FOR FREE LIST. 2272411 2272412 2272646 080 086 065 www.americanradiohistory.com 0.24 0.47 0.21 0.21 2573405 0.21 0.17 2N3414 2N8415 2N2904A 0.21 2272905 0.21 2N2905A 0.91 2N2906 0.16 23029064 0.18 2273416 2272714 2272904 0.20 0.28 0.42 049 042 046 012 2N3417 2273525 2313846 2301702 2278703 2318704 2378706 2273706 2273707 2273708 2272907 0.20 2302907A 0.22 2272923 0.14 0.13 0.24 085 008 009 2N2924 0-14 0.14 2272926 2272926 (G) 0.12 0.80 2N3709 0.12 2N2926 (Y) 0-11 086 0.24 050 2278710 2303711 2278819 2273820 2273821 2272926 (0) 010 0.28 0.28 2N2926 (R) 0.10 0-20 0.20 2N8823 2N3903 2272926 (B) 0-10 0.14 0.80 0-21 0-21 0.20 0-22 0.14 0.14 0-17 2278904 2273905 2273906 0.70 0.14 0.17 2273010 2273011 2273053 2N4058 2274069 0-10 2N4080 0.12 0.12 0.12 2304081 2274062 2274284 2N4285 2274286 2304287 2274288 2274289 2274290 2274291 2274292 2274293 2316172 2275457 2305458 2316459 042 0.15 0.15 0.28 0.28 0-75 0.09 28301 28302A 28302 28303 28304 0.10 0.10 0.11 010 0.09 28305 28308 28307 28321 28922 28322A 0-11 0.07 0.09 0.09 0.09 0.28 0.60 0.86 0.98 0.28 0.80 28323 28324 28325 28926 28327 28701 40361 40362 0-28 0.27 0-12 Hat) l8p ea. 10W (SO.1 Stud) 26p ea. All full: 0.17 tested 5% tot. an 0.17 marked. State voltag 0.17 required. 0.17 0.17 0.17 10 amp POTTED 0.17 BRIDGE RECTIFIER 0.17 0.17 on heat sink. 0.17 0-12 100PIV. 90p each 0.32 032 0.40 0.50 0.42 0.42 0.56 0.70 0.84 NEW LINE Plastic Encapsulated 2 Amp. BRIDGE RECTO 50v RMS 329 eac 100v RHO 37D . 400v RMS 48p Size 16 mm x 6 nie 0 84 0.84 0.56 0.42 0.42 0.58 0.70 0.70 0'70 0.70 0-42 0.40 0'45 UHIIIINCTION Egvt. 2N284( Eqvt. TI843. BEN300 UT40. 279 each, 26-99 26 100 'UP 20p. CADMIUM CELL. ORP12 43p ORP60, ORP61 40p sac GENERAL PURPOS DIODES AND RECTIFIERS 48119 0-21 0-21 0.23 0.23 0-20 0-20 BA126 BA148 0-45 0.87 BA164 BA166 BA168 BY100 BY101 0.82 0.72 0.57 0.60 0.85 0.85 006 009 021 012 0.14 0.18 0-14 0.18 050 60 0 50 0 50 100 200 060 400 050 800 800 0A85 0A90 0A91 0496 040 0-U 0A200 04202 8010 0.86 016 016 C0861 (Eg) 0A700A79 0.08 028 0.86 0.21 0A5SL 0.18 0481 0-85 0.50 0.30 0.86 BYZI9 028 C062 (Kg) 0A91 BYI80 0A10 0A47 0A70 0A79 042 016 BYI06 BY114 BYI26 Op BYZIO BYZ11 BYZ12 BYZ13 BYZ16 BYZ17 BYZ18 0.10 0.10 0.12 0.17 0.12 0.14 Price PIV 021 BY164 0-50 BYE38/80 0.00 BY127 BY128 0.35 0.22 0.20 BY133 0-08 AA120 AA129 AAY30 A.AZ13 BA100 BA116 0.17 8D19 IN34 IN84A IN914 06 0-35 0-07 0.07 0.07 0-07 0.09 0.06 0.06 0-07 0-08 0.07 0.05 0-07 IN414B I8021 0.08 0.06 0:06 0.10 18951 0 06 1N916 TOS TO60 T066 T0134 TO48 TO48 T048 T048 023 026 0.86 0ßS 0.47 0.60 0.63 1.15 025 0.38 0.47 0.47 0.60 0.68 0.83 1.40 0.35 0.37 0.49 0.49 057 0.61 0.76 1.80 0.43 0.47 056 066 0 87 0.76 0.98 1.75 063 067 0 68 0.88 0.77 0.97 1.26 0.68 070 080 080 0.90 120 1.60 4.00 SIL. SECTS. TESTED PIV 60 100 200 400 lOOmA 0.04 800 800 1000 1200 0.04 0.06 750mA 0.06 0.08 O-09 0 18 0 06 0.07 0.10 0.16 0.17 0.25 - 0.11 0ßE lA 1-5A 3A 0.06 0.06 0.06 0.07 0.18 0.14 0.20 0.23 0.25 0.80 0.14 0.16 0.20 0.27 0.84 0.87 0.48 0.57 007 0.10 0.11 0.14 - O-88 l0A NPN SILICON SWITCH TRANS. TO -1 ING SIM. TO 22706/8. BSI 27/28/964. A.I.I usabl devices no open or ohm circuite. ALSO AVAII ABLE In PNP Sim. t 2N2908, BCY70. Whe ordering please stai preference NPN or PN] 6D 30A 100 15 0.45 0.65 1.86 200 - 963 2.60 0.76 GENERAL PURPOSE GERM. PNP Coded ßP100. BRAND NEW TO-3 CASE. POSSIBLE OUR PRICE EACH: 1 25-99 45p -24 50p 100 up 409 2N3055 115 WATT 811 POWER NPN ß0D EACH. 1 7 7I 18.1 SIL. O.P. DIODES II -( TRIACS VBOM 2A 8A 10A TO-1 TO-66 TO-f 100 200 400 Sp 30 50 70 Op Op 50 60 75 1.1( 78 90 DIACB WIT FOR USE TRIACS BR100 (032) 87p cal FREE One Pak of yo 150p own choice tree wi orders valued 64 or oui BRAND NEW TEX/ GERM. TRANSISTOI Coded and Pak N guaranis . T1 REPLACE:- OC26-28-29-30- 35-38. NKT 401- 403 -404- TI 405- 406- 430 -451- 452 -453. TI3027 -3028, 2N260A 2N456A- T3 487A -458A, 2N511 A & B. 20220-222, ETC. VCBO 801 VCEO 50V IC 10A PT. 30 WATTS Hte 30-170. 1-24 25 -99 100 up PRICE 48p each 40p each 86p each 1.0 30..01 300mW 40PIV(Mln.) 100..1.1 Sub -Min. 600..6 Full Tested 1,000..91 Ideal for Organ Builder 021 0.50 075 024 1 00 0 57 0'6 For For For For 60 Oß8 POWER TRANS BONANZA! SILICON High Voltage 250V NPN TO -3 case. O.P. Switching & Amplifier Applications. Brand new Coded R 2400 VCBO 260 /VCEO 100 /IC 8A/30 Watte. HFE type 20 /fT 5MHZ. For 20 500 0.06 1000 0.07 NEW LOW PRICE TESTED S.C.R.'s 5A 6A l0A 16A 30A lA 3A 7A T4 TO TO 203713 D1374 EQ% OC OC D1216 0081 OC 2G381T 20382T OC 20344E OC 20345B OC 20378 OC 20899A 2N13 AF1 T10 20417 All 60p each pak. T7 TO TO 212060 IIPN BM.. DU! TRANS. CODE 1316 TEXAS. Our price 2 each. SILICON 60 WATTS HATCHED NPR /PIP BIP 19 NPN TO-3 Plastic. BIP 20 PNP. Brand new. VCBO 100/VCEO 60 /IC 10A. HFE type 100 /ft 3mHZ. 120 VCR MI%IE DRIVE 100 pre. 50p CODED ND 120, 117p each. TO.S NE 25 up 159 each. OUR PRICE PER PAIR: 25 -99 pre. 55p 1 -24 pre. 60p AD161/162 PNP M/P COMP GERM TRANS. OUR LOWEST PRICE OF ß6p PER PAIR SILICON PHOTO TRANSISTOR TO -18 Len. end NPN Sim. to BP x 25 and P21. BRAND NEW. Full data available. Fully guaranteed. Qty. 1-24 25.99 100 up JUMBO COMPONENT PAKS MIXED ELECTRONIC COMPONENTS Exceptionally good value Si, TRANSISTOR. BOX21 & C407, 22718 FULLY TESTED AN Sil. trans. suitable i P.E. Organ. Metal TOEqvt. ZTX300 6p ear Any Qty. NEW ED IT /OA 1971 Reinder., capacitors, EQUIV, pots, electrolytic' and TRANSISTOR Price each 46p 40p ß6p LENTS BOOK. A coi coil' plus many other plete croes reference a F.E.T.'S useful Items. Approxi- equivalents book 2N54513 23/3819 36p 50p mately 31be in weight. European, American a Translate Japanese 2273820 60v 2/0469 409 BFW10 409 Price inch P. & P. 6160 Exclusive to BI -P,1 2303821 36p MPF106 409 only. 219823 Bop 009 mob. NEW COMPONENT SHOP NOW OPEN WITH A WIDE RANGE OF ELECTRONIC COMPONENTS AND ACCESSORIES AT COMPETITIVE PRICES- B1 -PAKS 0.48 0.50 0.14 2N3391A 0.16 2302392 0.14 2303398 0.14 2N3394 0.14 2273395 0.17 2303402 0.21 2273403 0.21 2273404 0.28 2273064 2273005 2273391 0.2.4 2N2711 2N2712 0.26 Satisfaction GUARANTEED In Every Pak, or money back. Desoriptlan Pak No. 0 50 U 1 120 Glase Sub-Min. General Purpose Germanium Diodes 050 60 Mixed Germanium Translator. AF /RF U 2 0 60 4 AC 126 transistors PNP like 0Á6, 0A47 Sub -Min. Gold Bonded 75 Germanium U 8 050 7 00 81 type transistors U 4 40 Germanium Transistors Ilke 0081, AC128 050 type transistors Q10 7 00 71 0.50 U 6 60 200mA Sub -Min. Silicon Diode. 0.60 Q11 2 AC 127 /128 Complementary pain PNP /NPN 050 30 811. Planar Trans. NPN like BSY96A. 227708 U 6 060 Q12 3 AF 118 type transistors 16 SG. Rectifiers TOP -HAT 750mA VLTG. RANGE up to 1000 0.60 U 7 060 Q13 3 AF 117 type transistors 0.60 Q14 3 OC 171 H.F. type translators 50 Sil. Planar Diodes DO-7 Glass 260mA like 0A200/202 U 8 0 50 0.60 Q15 7 2272928 fill. Epoxy transistors mixed colours 0 60 U 9 20 Mixed Voltages, 1 Watt Zener Diodes 0.60 Q16 2 OET880 low noire Germanium transistors 20 BAY50 charge storage Diodes DO-7 Glass 1710 0.50 0.50 Q17 6 NPN 2 X ST.141 Á 3 x ST.140 Ull 26 PNP Sil. Planar Trans TO-5 like 2271132, 2N2904 0.60 060 Q18 4 MADT'S 2 X MAT 100 & 2 X MAT 120 0 50 1.712 12 Silicon Rectifiers Epoxy 500mA up to 800 PIV 0.60 Q19 S MADT'S 2 X MAT 101 & 1 x MAT 121 050 1713 80 PNP-NPN Oil. Transistors 00200 & 28 104 050 0.60 Q20 4 OC 44 Germanium transistors A.F. 1714 160 Mixed Silicon and Germanium Diodes 060 0.60 Q21 4 AC 127 NPN Germanium transistors 1715 26 NPN Sil. Planar Trans. TO-5 Ilke BFY51, 227697 060 transistors A.F. R.F. coded Q22 20 NKT Stud Type up to 1000PIV 0.60 Rectifiers 1716 10 3 Amp Silicon 050 0.60 Q23 10 OA 203 Silicon diodes sub -min. 0117 30 Germanium PNP AF Transistors TO-5 like ACY 17.22 060 8 OA 81 diodes Q24 0.60 8 6 Amp Silicon Rectifiers BYZ13 Type up to 600 PIV 1718 050 0.60 Q26 16 1N914 Silicon diodes 76 PIV 75mA 1719 26 Silicon NPN Transistors like BC108 Q26 8 OA96 Germanium diodes sub-min. Iá69 .... 0.60 0.50 12 1.5 Amp Silicon Rectifiers Top Hat up to 1000 PIV U20 050 Q27 2 10A PIV Silicon rectifiera I8425R 0.60 Q28 2 Silicon 30 AF. Germanium Alloy Transistors 20300 Series & 0071 1121 050 power rectifiers BYZ 13 0.60 Q29 4 Silicon translators 2 X 2N696, 1 X 227697. U23 30 MADT'e Ilke MHz Series PNP Transistor. 0.60 U24 20 Germanium 1 Amp Rectifiers OJM Series up to 300 PIV 0.60 1 x 227698 0 50 0.50 Q30 7 Silicon switch transistors 227708 NPN 1726 26 300 MHz NPN Silicon Transistors 2N708, BBY27 0 50 0.60 Q31 8 Silicon switch transistors 227708 NPN 30 Fast Switching Silicon Diodes like Iá914 U26 1 transistors 2 2271131, X Q32 3 PNP Silicon X 0.60 12 NPN Germanium AF Transistors TO-1 like AC127 U27 060 3N 1132 1.00 10 1 Amp SCR's TO-5 can, up to 600 PIV CRBl /26.800 U29 0 60 3 Silicon NPN translators 2271711 0.60 Q33 16 Plastic Silicon Planar Trans. NPN 2N2926 1730 Q34 7 Silicon NPN translators 2N2369, 500MHz 20 Silicon Planar Plastic NPN Trans. Low Noise Amp 2273707 0:50 1731 0 50 (code P897) 0.60 Q35 3 Silicon PNP TO-5, 2 X 2272904 A 1 X U32 25 Zener Diodes 400mal DO-7 case 3 -18 volts mixed 0 50 2272905 0.60 U93 16 Plastic Case 1 Amp Silicon Rectifiers Iá4000 Series 0 50 0.60 Q36 7 2273846 TO-18 plastic 300 MHz NPN 30 Silicon PNP Alloy Trans. TO-5 BCY26 28302/4 U34 0.60 0:50 Q37 3 2273053 NPN Silicon translator. U85 26 Silicon Planar Transistors PNP TO-18 2272906 0.60 translators 4 X 2273703, 3 X 2273702 Q38 7 NPN 0.60 25 Silicon Planar NPN Transistors TO-5 BFY60 /61/62 1738 0.50 U97 30 Silicon Alloy Transistors 80.2 PNP OC200, 28922 0.50 1138 20 Fast $witching Silicon Trane. NPN MHz 2273011 ELECTRONIC SLIDE -RULE 0 60 1739 30 RF. Germ. PNP Transistors 2271308/5 TO-5 MK Slide Rule, designed to simplify Electronic cal0.50 The 10 Dual Transistors 8 lead TO-5 2N2060 1740 culations features the following scales:- Conversion of 0.60 Frequency and Wavelength. Calculation of L, C and fo tI41 25 RF Germanium Transistors TO-5, 0C41, NKT72 1742 10 VHF Germanium PNP Transistor TO-1 NKT867, AF117 0.60 of Tuned Circuits. Reactance and Self- Inductance. Area of 0.50 Circles. Volume of Cylinders. Resistance of Conductors. U40 25 Sil. Trans. Plastic TO.18 A.F. ßC113/114 of Conductors. Decibel Calculations. Angle Func0.60 Weight 1744 20 Sil. Trans. Plastic TO.S BC116 /NPN tions. Natural Logs and 'e' Functions. Multiplication and 1.OÓ Division. Squaring, Cubing and Square Roots. Conversion U46 7 3A SCR. T066 up to 600PIV of kW and Hp. A muet for every electronic engineer and Code No's. mentioned above ere given as a guide to the type of device In enthusiast. Size: 2 cm. x 4 cm. Complete with case and Price each: 28.36 instructions. the pak. The devices themselves are normally unmarked. A LARGE RANGE OF TECHNICAL 0.20 0.29 0.20 0.20 2N2268 0.17 2N2369 0.14 2N2369A 0.14 2272219 2272220 2272221 2272222 0 17 01 VOLTAGE RANGE 400mV (DO2-23V. Case) 13p ea. 19W (Top le BALDOCK STREET (A10), WARE, HERTS. TEL. (STD 0920) 41593. OPEN MON.-SAT. 9.16 a.m. to 8 p.m.. FRIDAY UNTIL 8 p.m. a59 Wireless World, February 1973 -the lowest prices! The AL50 HI -FI AUDIO AMPL 74 Series T.T.L. I.C'S 50W pk 25w(RMS) BI -PAK STILL LOWEST IN PRICE FULL SPECIFICATION GUARANTEED. ALL FAMOUS MANUFACTURERS 1 15 0.16 0.15 0.15 0.15 8N7400 0 8147401 SN7402 8N7403 8N7404 045 016 8517405 SN7406 SN7407 8N7412 8N7413 8N7418 8N7420 8577422 8157423 8517426 8N7427 8N7428 8N7430 8N7432 8N7433 01.7 0.14 016 0.46 0.80 8157437 014 8N7438 8N7440 8N7441 8N7442 8N7443 8N7444 8N7445 8N7446 8N7447 0.64 0.16 0.67 0.67 1180 1180 8180 0.97 1100 8157448 0:81 011 017 0.48 0.48 0.16 0.60 0.60 0:60 0.46 0.70 8617417 014 014 014 0.18 016 016 486 019 8617410 5157411 0-14 0-14 0.14 0.86 018 SN7408 8N7409 25 £1.00 014 011 018 040 0.40 044 0.48 048 0.48 0.42 0.86 044 0.42 0.76 012 0.62 044 0.84 0.64 1125 1126 11.77 0.94 0.97 0.97 11 0.12 0.12 0.12 0.12 012 018 018 018 016 012 018 0.28 0'24 018 0.88 012 8N7460 8N7451 8N7463 8N7464 8N7460 8N7470 8N7472 8N7473 8157474 8N7476 8N7476 8N7480 BN7481 BN7482 8N7483 8N7484 BN7486 0.46 0.46 0.46 0.40 0.60 8N7486 0:40 8N7494 8N7496 8N7498 012 0-70 0.60 0.60 012 0.58 068 1120 6120 1176 0.88 0.96 0.95 BN7489 8N7490 8157491 8617492 8157493 81574100 8N74104 BN7410á BN74107 BN74110 8N74111 8N74118 8N74119 8N74121 8V74122 014 0.16 016 0-15 0-15 0-15 0-14 0-14 0-14 0-14 0.87 0.87 0.46 0.40 0 87 0-85 0.86 0.48 0.89 0.84 0.87 61-16 0-88 019 019 2120 1110 1100 1360 0.82 1660 0.67 0.87 0.87 0'77 0.77 0.87 11.66 0.97 0.97 1100 1186 040 2140 012 8N74165 SN74166 0.42 018 0'68 1110 0.86 0.96 0.90 13.40 0.95 064 010 1600 058 074 068 0.81 1626 0.95 0.84 0.84 0.90 0.58 0.58 0.74 0.84 0:68 0:78 1166 1160 0.94 0.88 0-88 0.86 0.50 094 088 0'68 1116 1110 1125 1110 1180 1140 0.96 0-90 014 0.87 6280 087 2150 2300 2100 2120 1180 2140 85174123 012 0-12 0-24 0-24 0-32 1360 1 BN74141 8N74145 8N74160 0.12 0-12 1105 040 0.66 11.25 012 018 018 1100 0.1% DISTORTION! HI -FI AUDIO AMPLIFIER 100+ 26 1 BN74181 BN74153 8N74104 11 40 135174157 2190 85174160 81474161 11-80 11 80 2400 2400 6220 8N74182 8N74183 8N74164 22 25 130474165 1360 1210 1180 8N74186 8N74174 25 12.70 0.84 2140 2270 095 1110 1170 1130 1110 21.80 11-70 1170 1375 13-75 22 15 12 20 1825 12-20 8N74177 8N74180 8N74181 8N74192 8N74184 8N74190 2250 1200 2650 1200 1160 1240 6240 1180 1600 1180 88 50 13 25 85174191 11 90 61-95 81574176 85174178 12 50 1196 8N74192 8N74193 12.00 85174194 1270 8N74195 12 11 g1 15 15 81574198 8N74197 85174198 BN 74199 00 80 80 50 50 1190 1185 1190 1180 1260 1190 61-70 1170 g600 1600 100 60 0.58 2180 6260 0.90 0.96 11.80 1120 6120 2170 6140 6180 1350 Frequency Response 16Hz to 100,000-1dB. Load -3, 4, 8 or 16 ohms. Supply voltage 10.86 Volts. Distortion- better than 0-1% at lkHs. Signal to noise ratio 80d11. Overall size 63 mm x 106 mm x 19 mm. Tailor made to the most stringent epeclficstlons using top quality components and Incorporating the latest solid state circuitry conceived to fill the need for all your A.F. amplification needs. FULLY BUILT -TESTED -GUARANTEED. BRITISH MADE. only 13.50 £3.25 each 12 10 6215 13-00 22.10 STABILISED POWER 1140 22 80 1230 1140 1475 £2.95 MODULE SPM80 61 80 41,80 is especially designed to power 2 of the AL50 Amplifiers, up to 1300 watt (r.m.s.) per channel simultaneously. ml. module embodies the latest componente and circuit techniques Incorporating complete short circuit protection. With the addition of the Mains Transformer MT80, the unit will provide outputs of up to 1.6 amps at 35 volts. Bise: 63 mue x 105 mm x 20 mm. These unite enable you to build Audio Systems of the highest quality at a hitherto unobtainable pries. Also ideal for many other application including: Disco Systems, Public Address, Intercom Unite, etc. Handbook available, 10p. 16 11-85 6180 1186 11-76 12.50 6180 1160 1160 TRANSFORMER BMT80 £1.95 p. 24-50 150 Et p. 25p NUMERICAL INDICATOR TUBES STEREO PRE- AMPLIFIER TYPE PA100 Minitron MODEL Anode voltage (Vdc) Cathode Current (mA) CDO6 GR116 3010F 170min 175min 6 2-3 All Indicator. 0 9 + Decimal point. All side viewing. Full data for all 14 8 Numerical Height (mm) 18 13 9 Tube Height (mm) 47 32 22 Tube Diameter (mm) 19 19 12 wide BP41 or BP47 types available on request. Built to a specification and NOT a price, and yet still the greatest value on the market, the PA100 stereo pre-amplifier baa been conceived from the latest circuit teohnlques. Designed for use with the ALSO power amplifier system, tole quality made unit Incorporates no leu than eight 'Moon planar transistor, two of these are specially selected low noise NPN devices for use ln the Input stages. Three switched stereo inputs, and rumble and scratch filter. are features of the PA100, which also ham a STEREO /MONO switch, volume, balance and continuoualy variable bacs and treble controls. SPECIFICATION: f ±15dB st 20Hz Base control 6$ at 20kHz Treble control Filters: Rumble (high pass) 100 8kHz Scratch (low pees) than +85dB better PRIOR EACH 11.70 11.66 11.90 Signal /noise ratio +26dB Input overload +35 volts at 20mA Supply 292 X 82 X 36 mm Dimensions INTEGRATED CIRCUIT PAKS Manufacturers 'Fall Outs' which Include Functional and Part-Functional Units. These are classed ea 'out-ofALSO's, spec' from the maker's very rigid specifications. but are Ideal for learning about I.C's and experimental work. SPECIAL COMPLETE KIT COMPRISING 2 I SPMBO, I BMT80 & I PA I00 ONLY 123.00 FREE p.&p Pak No. Contents Prise Pak No. Contents Price Mee Pak No. Contents 1.71C00=12>`7400 0.50 UIC48=6 x 7948 050 UIC86= 5x7486 0.50 1.11001=12X7401 0.60 U1C47=6X7447 050 UIC90- 6x7490 0.50 1714702=12x7402 O SO 211048=6747448 050 ÚK91 -5 x 7491 0.60 U IC03 =12 X 7403 0.50 UIC60 =12 x 7460 0 50 ÚK92 =6X7492 0.60 11I004-12X7404 0.50 211361-12x7461 0 50 111093= 6x7493 0-50 tested The 'Stereo 20' omplfier is mounted, ready wired and 211006-12X7405 0 50 U1053-12x7453 050 U1094 =5x7494 0.50 cm on a one -piece chassis measuring 20 cm x 14 em x 6'5 211008-8x7408 0 60 U1064=12X7464 0 50 U1095- 5X7496 0.50 on /off switch, volume with complete comes unit compact This 111007-8x7407 0 50 U1080=12x7480 0 50 ÚI096= 6x7498 0.60 control, balance, boas and treble controls.Attroctively printed 112010 -12 x 7410 0.60 U1070=8 x 7470 0 50 1110100 =0x74100 0`50 has 20' 'Stereo The front panel and matching control knobs. O 1018-8x7419 0-50 111072=8x7472 050 0.50 U10121 -0 x 74121 without been designed to fit into most turntable plinthe U1020-12 x 7420 0 50 171073 = 8 x 7473 0 60 U10141-ex 74141 0.60 interfering with the mechanism or, alternatively, Into sep11I080-12x7490 0 50 211074=8x7474 0 50 2110161 -a X 74151 0'50 arate cabinet. 111040 =12 X 7440 0- 50 U1076 = 8 x 7476 050 2110154 -S X74154 0.60 1M into 300mV Input 1 (Ger.) Output power 20w peak 211041- 5 x 7441 0 50 111078 = 8 X 7476 050 111C19ß- 8X74193 0.60 Input 2 (Aux.) 4mV into 80K Freq. ree. 2511z-26kHz 211042-0x7441 0-50 212090-0X7480 050 U10199- 5X74199 0.50 60Hz at ±12dß Bass control distortion Harmonic 111043 -5 x 7449 0 50 U1C81=5 x 7481 0-60 Treble con. 14dB at 14kHz typically 0.25% at 1 watt 131044-0X7444 0.50 231082-5x7481 1110 060 UICXI -25 Assorted 74's 1.60 U1045 -5 x 7445 0.50 U1C83=5 x 7483 0.60 Et p. p. Pecks cannot be split, but 25 assorted pieces (our mix) is available sa PAK UIC Xl. I.C. Driver Rec. BP41/14 141 20Hz-20kHz 1dB Frequency response better than 0.1% Harmonic distortion 1.25mV Into 60X43 Inputs: 1. Tape head 36mV Into 60X81 2. Radio, Tuner 1.6mV into 60X13 3. Magnetic P.U. All Input voltages are for an output of 260mV. Tape and P.U. Inputs equalised to RIAA curve within ±1dB from 20Hz to 20kHz. 141 only The £11.95 STEREO 20 f £12.25 free LINEAR I,C,'s -FULL SPEC. Plia NEW COMPONENT PAK BARGAINS Type No. Pack No. C 1 C2 C C4 C6 C 8 0 7 Description Resistors mixed values approx. count by weight .. Capacitors mixed value, approx, count by weight Precision Resistors 1 %, mixed values .. .. 5th W Resistors mixed preferred values .. .. 5 Pieces aseoeted Ferrite Rods .. .. 2 Tuning Gangs, MW /LW /VHF .. .. .. 1 Pack Wire 50 metres assorted colour .. .. 10 Reed Switches .. .. .. .. 9 Micro Switches .. .. .. .. 15 Assorted Pots A Pre-Sets á Jack Sockets 3 X 35mm 2 X Standard Switch Typ es 40 Paper Condensers preferred types mixed values .. Qty. 250 200 60 75 . BP BP BP 0.60 BP 0.50 BP Prise .. . .. .. .. 0.60 . .. 2010-8L201C 7010-8L7010 7020-BL702C 702-72702 709-75709 BP 709P-0.7090 BP 710-72710 BP 711-pA711 BP 741-72741 1 -24 26 -99 200 up Sop 58p 1385 63p 585 88p 365 44p 455 765 28p 705 805 5005 465 34p 845 425 48p 805 265 605 75 158p 46p 465 465 40p 305 30p 40v 40v 50p 24p 555 70p 1505 11A7090--µA7030 TAA 283TAA 293170p C10 0.60 TAA 850 011 .. .. .. 0.60 8.1;48. EA100012.88 012 .. .. .. .. 0.60 ROCK BOTTOM PRICES 013 20 Electrolytic° Trans, types .. .. .. .. 0.60 LOGIC DTL 930 Series I.C's C14 1 Pack assorted Hardware -Nuts /Bolts, Grommets etc .. .. .. .. 060 Type Price C16 4 Maine Toggle Switches, 2 Amp D/P .. .. .. 060 No. 1 -24 25-99 100 up C18 105 20 Aaeorted Tag Strips 4 Panels 125 lip .. 0.60 BP990 115 135 12p BP932 017 10 Assorted Control Knob. .. .. .. 050 lip 125 195 018 4 Rotary Wave Change Switches .. .. .. .. 0' 50 BP983 115 18p 125 BP936 C19 3 Relays 6-24V Operating .. .. .. 0.50 BP936 lip lap 125 C'J0 4 Sheets Copper Laminate approx. 10' X 7' lip 135 125 BP944 Please add 10p poet and packing on all component packs, plus a further lOp on pack Noe. Cl, BP945 24p 225 255 02, 019, C20. 10p lip 125 BP948 24p 25p BP948 22p 555 RTL MICROLOGIC CIRCUITS 130p 865 DUAL -IN -LINE IC's. TWO Range. BP951 10v Ilp 12p PROFESSIONAL A NEW LOW COST. BP962 Price each 355 885 405 PROF. TYPE 1 -24 25-99 100 up. 11119099 No. 1 -24 25-99 100 up 35p 40p 985 BP9094 T80 14 pin 275 255 type 80p Epoxy TO-6 case uL900 405 355 88p BP9097 110 18 30p 855 32p Buffer 86p 88p 27p 855 40p 885 BP9099 u Dual 21 Device. may be mixed to qualify for LOW COST No. uL928 J -K Sip flopta 60p 4477p 46p BPS 14 135 115 quantity price. Larger quantity prices 165 Data and Circuits Booklet for IC's Price 7p. BP8 16 145 12p on application. (DTL 930 Series only). 185 C8 0 9 .. .. . 0-50 . . . www.americanradiohistory.com SYSTEM 12 STEREO Kit contains two Amplifier Modules, 3 watts RMS, two loudspeakers, 16 ohms, the pre -amplifier, transformer, power supply module, front panel and other accessories, as well as an illustrated stage -by -stage instruction booklet designed ONLY for the beginner. Each Further details available on request. £16.95 FREE p. & p. G,ro No J86 /001, pr,res goofed on new pence Please send all orders d,recl to warehouse and despatch droarl 'r ^, All BI-PAN P.O. BOX 6, WAREextraHERTS for aprma,I Postage and paca,ng add 10p. Overseas add M,n,mon, order !Op Cash w,lh or der please Guaranteed Satisfaction or Money Back a60 Wireless World, February 1973 ATTRACTIVE E LECTRÜ ALUE DISCOUNTS Electronic Component Specialists ON VERY MANY ITEMS WHEN YOU BUY FROM US SEMI -CONDUCTORS SIEMENS CAPACITORS Brand new, guaranteed to t spec. No seconds or surplus. POLYCARBONATE - --5 %p TOLERANCE 250V. up to 0 -I1.r.F: I00V.10.1µF and above Insulating sets free with power types 0'01; 0.012; 0.015; 0.018; 0.022; 0'027; 033; 0047: 0056; each 4p. 0.068; 0.082; 0I; 0.12; 0'IS each 4p. 0.18; 0.22; each Sp. 0.27; 0.33; 6p. 0.39 7p. 0.47 8p. 0.56 10p. 0.68 11p. 1(sF 13p. TO3 Transistor coven, each, 7p 1759 273053 1144.:1(10 lap .74:4i54 POp 2N:45-' iN914; ;N:4754 1.55 99 24p =52323 23p 2310:i 35p 25:14;^:+ 15540_ 155407 1241 12040 .56'.i5 N 027 1:5;'116 9N4:í0 251121 'N11:2 251:if: 25 7703 1.15310/ 21:4,-u5 2N 305 I Slp 255479 ^lp API l4 52pi40251 109'40:4, 80p AF115 45p API' 46p A' 53n 10p140:162 109,40474 2bp '-7::i709 8p 4047+104 1' 2':.t75 77p 41.1130 90p .A1)101 300 41)102 30p AU161¡2 40p 444150 10p 42404 10p 40412 10p 49430 19p 2 ::1711 o8p 2':::731 26p 251794 :4n:t 55p 255193 80p 255457 2'C4757 2N:171.4i l9p 2':.:719 25 1504 87p 1iC11. 429 It' n 53D 5:4(1124)1 23p 19p llp 4 40r r 330' NK'r217 110 SKT271 4 llp K 1Z74 149 Ilp 7KT275 25p 889 849 83p 324 47p NKT403 330 5KT404 n70 O' K1.405 30. 7KT003P 27p NKTn1aP 235 7KT6741, ,if/9 71rT^--. 10, -,' ELECTROLYTIC (Values in 17F -V) 0.47/100; /100; 22;63; 4.7/3S; 10/25; 22:16; 47,'10: 47/25; 100 /10: 220/3 -each 5p. 10/63; 22135; 47/35; 100/16; 100/25; 220/6; 220/10; 220;16; 47013 each 7p. 47/50; 47/63; 100/35; 220 /16 each 8p. 100 /S0: 220/35 each 10p. 100/63; 470/25; 1000 /10 each 12p. 220/63; 470 /35: 1000116; each 17p.'100/25 20p. 470/63; 1000 /35 each 23p.2200125 36p.I000/63; 7.20( 4700/16 each 40p. 1 alp Mp 2 SOLDERSTAT ;RÓ°;s 33p 2-;:i.... 33p N 130,0 N 274a7'1 5p 5p 17p 18p 12p 210 25p P7pY275192 l'0,7 36r 2N (3044 2N 1..01: 251512; 2517,!i9 YN11i13 YN'1711 2 N 1597 sg :711.17 QM i2, 12p., 1P20 Log, 7K 12 to 2.291 O. 42p; ntilog. 10K, 22K, 47K, 42p. Any type with 2A It's more ú- 25221,1 52,:. 359 420 47p .',NY1.4 2N',;li4ß 2 2521404 27 2204A 25^'4n:, 4429 2N2M15A 2N:'-124 2.5 2225 4 s than just 19 a 449 27 W: 2-7V to 36V, 7 FLH35 FLH 12 911101 I FL112 Fu14 FU15 FU13 FLH221 (7 pacítors by MFD ..- ...aF up to 224:F `pp -í3.50 and delivery request. (7451) (7451) (7454) (746fí) (7471) ETERS o T -Dec, S -Dec, and connection diagrams mounting boards LINER KITS module kit, supply kit L6 SO (74821 (7483) FL1221 (74911 .FL1171 911181 FL1231 F11191 FL1261 F11301 (74931 (7493) s Dual 1K mm Gated full THYRISTORS 2 V 4 bit shift register Divide by 12 counter 4 bit binary taunter (7494) 4 by shift register, parallel UP, ries OT (7495) 4 bit left shift right shift register (74%) 5 bit shift register (741110) Dual quad bi- stable latch FÚ281 (744.4) 1K master slave flip flop with 1K input F1127) (741E7) Dual 1K master slave flip flop FLK101 (74121) Monostoble flip flop F11201 174170) Up down decade counter (74191) Up down binary counter F11211 F!..1241 (74192) Up down decade counter with clear FL1251 (74153) Up down binary counter w.th clear AN) E.). 8 All packages t4 leads unless stated otherwise before prices. ELECTRO ALOE LTD for custom built by Quality Electronic in,- J (7473) Dui.. 1s (7474) Dual d -type (7475) Quad bi -sta (7488) blue! mos. Materials, Hardware, etc. (74731 JK (74761 of 8 colours Oreen: Sp. I.Cs plus schematics. theoretical +t' Imes. in all Po Switches. relays, connectors bit binary fu bit binary ful FLH341 (74861 Half adder 17498) Decade counter 911161 FLH23I FLH24) it Resistors & capacitors in very wide ranges Equivalents tables (74 ,. £2 Slide and rotary potentiometers Diodes, thyristors, tri -acs fully detailed FLHI3 FLHI4 FU I LI N o 0'01 - Hundreds of to -days most wanted transistors. with data and outlines FLHII FL110 °ONENTS or more. Send 25p for latest Electrovalue Catalogue now, post free. FLH39 266F) 4p, Mors by The Electrovalue Catalogue No.6 (4th printing 96 pages) is as much a manual of valuable technical information as it is a comprehensive. up -to -date catalogue of semiconductors, components, accessories, materials, tools, etc. All items are brand new and to makers' specifications. Prices are competitive. there are attractive additional discounts offered, and now we include a refund voucher for 25p available for spending on orders for £5 (7 (7 to 75V. 48p 25p REFUND --.__'.----'--° fLH38 FLH28 FLH36 FLH37 FLH 15 FLH16 FLH17 FLH18 PLISO V C,.M IM VOUCHER with SIEME 'e and we give t.ECISION epj44M. tateY FLH 10 FLH20 FLH 19 FLH29 FLH21 FLH27 , you a reMr419.,.Ww,.Nta 4neeYr 22011. 47014, K, 2M2, 5M, I0M il. I catalogue No. E1-EC 4k ato tie 22724 quoted. talon of P20 values, (16) 21'418p NENT e ISCOUNTS Nat allowed on nett price items 10 on orders for components for LS or more. IS',: en orders for 43p components for LIS or more. Prices subject to alteration S2p without prior notice., 124) 21 64 POSTAGE AND PACKING FREE (16) 41 '80 (16) t180 SURCHARGE lop (16) (1.74 U.S.A. CUSTOMERS ara recommended to contact ELECTROVALUE AMERICA. P.O. Boot 27, Sworthmor PA 19081. (16) LI 74 welcome: carr:np on small mol orders under (.2. Overseas orders and ,nsurance charged or cos, 56p, 600V 70p, 60p, 600V 88p. PUBLICATIONS Handbook of Transisror Eg:nva,ents, 40p. Handbook of Tested Transistor Circuits (44. Ness), 40p. Radio A Electronics. Colour codes 6 doto well chart, ISp. Engineers Relerence Handbook 8 Tables. 2Op. (Add 3p. for postage on each of abp.e 1 bought separately.) Prices appearing in this advertisement are for guidance only. Current prices are as shown in Catalogue No. 6 (4th printing/. (DEPT. WW. 1272),28 ST. JUDES RD. ENGLEF IELD GREEN, EGHAM, SURREY,TW20 OHS Phone: Egham 3603 Telex 264475 Hours: 9 -5.30, 1.0 p.m. Saturdays. www.americanradiohistory.com a61 Wireless World, February 1973 NEW BRANCHES NOW OPEN SUNDERLAND STOCKPORT COVENTRY (Opening Jan.) B IRMIN HAM 30 -31 t. ^astern Arcade B LACKPOOL (Closed Wed. O A C Electronics, 227 Church St. B RADFORD 10 North Parade (Closed Wed) HI -FI (Agent) CENTRES LTD MAIL OBI R8 to: COVENTRY 17 Shelton Sq. Opens Jan. DARLINGTON 19 Northgate (Closed Wed.) DERBY 26 Osmaston Rd. (Closed Wed.) EDINBURGH 101 Lothian Road Closed Wed. GLASGOW 328 Argyle St. (Closed Tues. HULL 7 Whltefriargate(Closed Thurs.) LEEDS 5-7 County (Mecca) Amide, Brlggete 108 HENOONNER LANE, LEEDS 18. Terme C.W.O. or C.O.D.. Postage 25p extra under £2. 30p extra over 82, or as stated. Trade supplied. B.A.E. with enquiries. REPORT EN UIEIEB WELCOMED BRANCHES OPEN ALL DAY SATURDAYS AND OPERATE A 6-DAY WEER MAIL ORDERS NOT TO:SE SENT TO SHOPS. NEWCASTLE 24 Newgete Shopping Centre (Closed Wed.) Tel. 21489 NOTTINGHAM 19 Market St. (Closed Thurs.) SHEFFIELD 13 Exchange St. (Closed Thurs.) STOCKPORT 8 Little Underbank Tel. 480 0777 SUNDERLAND 5 Market Square (Closed Wed.) LEICESTER 32 High( St. (CoedThurs.)28262 LIVERPOOL 73 Dale St. (Closed Wed.) LONDON 238 Edgware Rd., W2 (Closed 1829 MANCHESTER 0a OldhamSt. (Closed2Wed ) MIDDLESBROUGH 108 Newport Rd. (Closed Wed.) Tel. 47098 8+0 WATT STEREO AMPLIFIFIER High Quality Output. Rating I.H.F.M. Ind. Ganged Controls Bass, Treble, Vol. and Balance. Solid state constk. employing 10 Trans. plue diodes. Range 20.20,000Hz. Bass control ± 12 dB Treble ± 13 dB. Selector switch P.U. or Tape /Radio. Output for 3.16 ohm R.S.C. Gß6 MkI1 speakers. Standard 200.250v. 50 Hz males operation. Black/Silver metal face plate and matching knobs. COMPLETE WIRED IPRINTEDRCIRCUIT £11.50 UY FACTORY TEAK ENEERED CABINET Attractive £14899 TRANSFORMERS Ref. £25 138 .7 5 ULTRA HIGH POWER LOUDSPEAKERS 15' `POP' 60 Wtits £ 0.90 00 135 2 years guarantee. Gauss Carr. free 18' `POP' 100 Wa°te £12.90 0 1410 1 Gauss 12' 25 WATT £6.75 AMPLIFIER Including 2 Ind. controlled HI -FI Inputs Separate Bass and Treble Controls. Valves 2E88, EF88, ECC83, GZ34, EL34, EL34. Sensitivity SBmV. For High Imp. mic. or standards for CLUBS, SCHOOLS THEATRES, DANCE HALLS, DISCOTHEQUES etc. For use with Electronic Organ, Base or Lead Guitar. For Gram, Radio or Tape. For 3 or 16 ohm speakers. Twin -handled metal cover 11.90 IA with 12 FACTORY BUILT months' guarantee. Or Dep. 14 and 9 monthly payments £2.10 (Total 122001 B.A.E. for leaflet 8/150 55 63 92 128 129 190 14,000 Gauss 200.0.250v. 250.0.250v. 300 -0-800v. 800.0.300v. 80roA., 8.8v. 2a., 0.15.6.3v. 2a 100mA, 6.3v. 41., 0.5.8.3v. 8a 100mA, 6.3v. 4e., 0- 5.8.8v. la 180mA, 5.8v. 4e., c.t., 6.3v la For Mollard 610 Amplifier £1.40 £2.80 £2.20 £2.65 860.0.850v. 100mA., 13.3v. 4a., 0.6.6.3v. 3a 88.20 360. 0.860v. 150mA. 6.3v. da., 0.6.8.8v. 3a 8$86 455.0.425v. 200mA, 6.3v. N. o.t., 6v, 8a 84.95 425 -0425v. 200mA, 6.8v. 4a., 8.3v. 8a, 6v. lia 86.10 460 -0.450v. 250mA. 6.3v. 4a., c.t., 6v. lia £5.60 TOP SHROUDED DROP-THROUGH TYPE 260 -0.250v 70mA, 6.3v. 2a., 0.15.6.8v. 2e £1.35 260- 0-250v. 100mA, 8.3v. 8.5a £1.65 250.0.2150v. 100mA, 6.8v. 2a., 6.3v. la £1.60 350 -0.850v. 80mA, 6.3v. 2e., 0.5.6.2v. 2a £1.85 250.0.250v. 100mA, 6.8v. 4a., 0.6.6.3v. 8a. 82.80 200.0 -300v. 100mA, 6.8v. 4e., 0-5.6.3v. 3a. £2.20 800- 0 -300v. 1SOmA, 6.3v. 4a. o.t. 6.3v. la. £260 Suitable for Mollard 510 Amplifier £2.20 360.0 -850v. 100mA., 6.3v. 4s., 0.5-8.3v. Sa. 82.60 360 -0-350v. 150mA, 6.3v. 4a., 0.5.6.3v. 3a. FILAMENT or TRANSISTOR POWER PACE Typan 6.3v. 1.5a. 49o; 6.3v. 2a. Gee; 6.3v. 3a. 7501 6.8v. 6a. £1.30;12v. la. 5óp; 0.9.18V. lie. £1.10; 0.12. 25.42v. 2a. £1.75; 12v. 3a. or24v. 1.5a. £1.36; CHARGER TRANSFORMERS 0-9-15v. 990; lIa 2}a.,110o ;3w,1250 ;óa..1450;ó4..1860 :8a.. £2. AUTO (Step UP/Step DOWN) Trenatormen 50-80 watts 1100: 0- 110 /120v., 200. 230-250v. 155w., 1900; 250w., 2750; 500w., 5750. OUTPUT TRANSFORMERS Standard Pentode 6,0000 to 7.0000 to 30 Push -Pull 8 watts ELS4 to 8 0 or 16 0 Push -Pull 10 watts 8V6 ECL86 to 3, 6, 8 or 150 Penh -Pull EL84 to 3 or 15 0 10 -12 watts Penh -Pull Ultra Linear for Mullard 610, etc. Push -Pull 15.18 watts, sectionally wound 6L8 KT86, etc., for 3 or 15o Push -Pull 20 watt high quality sectionally wound EL84. 6L13. KT66, etc. to 3 or 16 (1 600 83P £1.37 £1.36 82.20 8199 83.30 BATTERY/MAINS CONVERSION UNITS R.S.C. BM1 battery eliminator completely replaces 1.5v. Complete Kit with diagram and 00v. Radio batteries where normal 200.250v. AC mains is available. 3 25 Ready for use E3 75 16.74 FANE 8077 HIGH FIDELITY SPEAKER 8' 10 WATT A full range unit to provide excellent sound quality In suitable enclosure. Roll P.V.C. cone surround and long throw voice coil to achieve very low fundamental resonance of 80 Hz. Tweeter cony extends high note response. Frequency range 26. 15,000 Ha. Imp. 3 or 8/150. ( state requirement.) Cast Chassis REMARKABLE VALUE E3.ß5 MODEL 808T 8' 15w. with paranytic Tweeter. Response 25 Hz to 16 KHz. Gauss ONLY £4.95 13,000 Imp 3 or 8.16 ohms. 67 84 93 SPEAKER KIT Inc. 903 8' emit, 303 Pressure Tweeter, Printed cir- cuit, Inductive capacitive cross -over, acoustic panels, screws, etc. Response 30.24,000 Hz I 21.6 X 21 .6 380 1 1 x20.3 p 7.77 11.20 20.67 34.10 53.34 300 500 1000 1500 2000 3000 Tapped P&P L 1 1.4 22 30 36 52 67 I66 200 0.2x10.2x 9.5 4.0 x 10.2 x 4 6 12 16 D 085 3.89 5.78 10.49 1 x14.0 x14.0 28 40 82. , , 5 Ref. Amps. No. 12V 24V 111 I.0 71 18 2 4 6 70 108 72 17 Ref. filling, ¡9.95 HIGH FIDELITY SPEAKERS AUDIOTRINE RANGE 10W £&8S 102D.10 10W £3.40 120...12' 15 W £4.50 Plesse state 120D .12 15W 84.99 impedance 126...12' 15W £5.75 required. 126D.12 15W 88.25 3 or 8 -16 ohm. HE 808T SPEAKER SYSTEMS Audiot ine 121K. 12 In. 15 watt. 11,000 Gauss bass unit. Cross -over unit and Tweeter. Smooth response and wide frequency range ensure re- alistic sound reproduction. Carr. 30p Andiotrine 125K with extra sensitive 15,000 Gauss 12 ix. speaker. lb oz 0.5 I I I 2 4 3 3 12 8 10 16 4 5 4 6 7 20 30 60 10 15 3 8 13 12 0 5 8 II 16 34 1 0 8 8 2.1 4 6 6 88 3.0 4.0 5.0 6.0 8.0 89 10.0 Ref. Amps No. 02 0.5 03 1.0 2 10 2.0 3.0 4.0 6.0 5 0 6 06 07 0 4 4 18 19 10.0 19 12 Amps. Weight 20 21 51 7 10 12 E5.95 E6.95 0- 12- 15- 20-24 -30V 0 4.O x 10.2 x 2 Ref. No. 24 26 27 25 23 20 22 0.5 Weight lb oz 9 12 l 7.0 x 7.0 x 5.7 8.3 x 7.3 x 70 10.2X B9x 8.6 10.2x10.2x 8.3 0-19-25-33-40-50V 4.0 6.0 1 VOLT RANGE 0- 24- 30- 40- 48-60V 8.9 x 7.6 x 7.6 0.2x 8.9 x 8.6 00 11.9 X 9.5 X10.0 10 6 16 12 23 60 2 1 1 1 10 I.4X 9.5x11.4 3.3 x12.1 x12.1 6.5 30 94 36 42 52 52 2.69 3.65 4.83 7.14 9.32 11.68 1. Size cm. P D I.33 x11.4 x 10.2 165xII4x159 & L I 8.3 x 9.5 x 6.7 67 P 12.1x11Ix13.3 13.3x13.3x12I 0 5 52 52 52 VOLT RANGE Secondary Taps 12.1 p 22 36 36 I.35 201 2.48 2.94 7.14 1.4 Size cm. lb oz 2 4 20 10.0 11 I P&P I.01 S64 50 . 5.78 10.67 1961 3.66 4.36 x10.0 x10.2 4.0x 117 x10.0 X12.7 X16.5 P p 22 22 22 36 42 52 52 52 67 82 1.01 1-33 Secondary Taps 4.9 6.0 7.6 8.6 02x100x 8.6 2.1 X10.0 X 8.6 & 1.86 0-12Vac30Ax2 30 VOLT RANGE Size cm. 6 3 P L 0.85 2.24 2.48 2.94 4.54 0-12Vac10Ax2 0-I2Vac 15A x2 13.3x12.1x12.1 17.0x14.5x12.5 8.3 x 3.7 x 70 x 6.4 x 8.9 x 70 x 0.2 x 13.9x 2 0-12VacIAx2 0-12Vac2Ax 2 0-12V ac3Ax2 0-12V at4Ax2 0-12Vat5Ax2 0-12Vac8Ax2 IO.Ox 8.3x 8.2 7.9 x 10.8 x 10.2 121 x 9.5x10.2 121 x11.4x10-2 4 0 2 1.0 117 0-12Vac0.25Ax2 0-12Vac0.5Ax2 lb oz. 0.5 2.0 79 Secondary Windings Weight Amps. No. 112 12 0 0 2 30 Size cm. 7.6x 5.7x 4.4 8.3x 5Ix 5I 7.Ox 6.4x 5.7 8.3x 7.Ox 7.0 10.2x 7.6x 8.6 Weight 97 97 P& L P D 1.35 1.88 36 2.94 4.48 5.78 8.37 42 52 67 82 36 13.83 LEAD AC ID BATTERY CHARGER TYPES PRIMARY 200.250 VOLT FOR CHARGING 6 OR 12 VOLT BATTERIES Weight Ref. Amps. 45 I.5 86 60 5 146 S.0 12.5 I I 1 I 6 II x 6.0 x 6.0 0.2 X 7.0 x 8.3 7.0 0.2 x 8.9 x 8.3 8.9 x10.2 x10.2 I 3.3 x10.8 X12.1 I 4 14 P&P Size cm. o9 1 I34 30 42 52 5.20 67 2.03 3.07 3.49 Please note, these units do not Inelude rectifier. All ratings are continuous. Standard construction: open with solder tags and wax impregnation. Enclosed styles to order. TRANSISTORS TO MANUFACTURERS' FULL SPECIFICATIONS BCI07 /108 /10990p each 25+ 7óp 6.5p 500+ 6.0p Minimum order this range. 2N 3055 68p each with mica and bushes 25+ 10 pieces *Quantity Heavy construction. Highly efficient ceramic magnets. P)aetifiex cone surrounds. 'D' indicates Tweeter cone providing frequency range up to 15 KID. Exceptional performance at low coat. Ol 025 0.5 213 100+ HI -FI 1 27 40 P 30 36 52 52 67 82 I5.20 3.5x14.9x16.5 19.84 7.8x16.5x21.6 26.99 45 7.4x18.1x21.3 TOTALLY ENCLOSED II5V AUTO TRANSFORMERS 500 Watt totally enclosed auto transformer, complete with mains lead and two I5V outlet sockets, 0.85.P & P 67p Also available a 20 Watt version. E1.67. P & P 22p. LOW VOLTAGE SERIES (ISOLATED) PRIMARY 200 -250 VOLTS 12 AND /OR 24 VOLT RANGE 50 FAITE MODE ONE HF HF HF HF HF x 10.3 x10.0 9.5 x 12.7 x .4 14.0 x 10.8 x 12.4 17.1 x 1.4 x 15.9 17.8 x17.1 x21.6 24.1 %21.6 x15.2 & I.61 2.39 2.62 4.39 12.0 1 1000 04 p 17.87 where neeeseary. Primaries 200 -260v.50 Hs. Screened. MIDGET CLAMPED TYPE Et x25 x 250v., 60mA, 6.3v. 2a. 990 250.0.250v., BOmA, 13.3v. 2a £1.05 FULLY SHROUDED UPRIGHT MOUNTING Dual Cone. 15 ohms NOT for Base Guitar. Or Dep. £1.26 and 9 monthly payments '.'5p (Total £8.00) 15'3$ FIILLY GUARANTEED. Interleaved and 'must. 1 9 12 5 2000 63 3000 84 6000 178 66 £22.95 SPEAKER ENCLOSURES R.S.C. MAINS TRANSFORMERS 3 5 P L 7.0 x 6.0 x 6.5 8.9 x 8.0x 7.7 10.2x 8.9x 8.3 11 31.1 x35.6 x17.1 87.52 440V 300VA ISOLATOR, Primary 440V Secondary 240V, C Screened and Shrouded, 19.43. P & P 67p. AUTO SERIES (NOT ISOLATED) Auto Taps Ref. Weight Size cm. VA No. lb oz (Watts) 7.3 x 4.3 x 4.4 0- 115 -210 -240 113 20 II 7.0 x 6.4 x 6.0 0-115-210-240 64 75 I I 4 3 8.9 x 6.4 x 7.6 0 -115- 200-220 -240 150 226 Teak veneer finish. Pleasing design. Acoustically lined. All sizes approx. TES 16 x 11 x9 In. PressorIced. Gives excellent results with 8 In. Hl -FI Speaker. BEB for optimum results with any 8 in. HI- F116'47 Speaker. 22 x 15 x 9 In. 8E10 outstanding performance with HI -Fi 10-in. speaker. 24 x 15 x 10 in. Ported. SE1E for high grade results with 12 in. HI -FI speaker and Tweeter. 25 x 18 x 100 in. Preaserleed. 757 L 7 200 250 350 500 115 187 FANE SPEAKERS `POP' 25/2 WATT HI -FI 100 30 write Or Dep. £2 and 9 monthly Or Dep. £3.30 and 9 monthly Or Dep. 16.00 and 9 monthly payments £1.20 (Total £12.80) payments £1.30 (Total £15.001 payments £2.20 (Total £25.80) Pair suitable for all purposes. SUITABLE FOR BASS GUITAR, ELECTRONIC ORGAN, etc. R.S.C. A10 30 61 Size cm. lb oz I I t Power Rating R.M.S. continuous. Weight VA 62 I Frequency Response COMPLETE SIT (less Solid State Cirodtry 7 Hz to 70 KHz cabinet). Carr. 65p 1} dB Twenty Silicon Transistor. Cabinet ifreq.£ó extra FACTORY BUILT UNIT INC. CABINET Four Diodes, Four Rectifiers with 12 months' guarantee. Or Dep. £7 and E. Send S.A.E. for full descriptive leaflet 9 monthly payments £3.99 (Total £42.91) S.B.C. STEREO FM TUNER NOW AVAILABLE. Visually matches Super 30 Mk. I iI at £44.95 12' TOP' 50 200 -250 No. ( Watts) 07 20 60 100 95 73 Only high grade components by leading manufacturers For Magnetics or Push Button Selector Switching Ceramics Pick-Ups Jaok Socket for Headphones Neon Indicator Output (per channel) 15 watts EMS into 80 Satin Silver Finish Metal Fuoia FANE Volts Secondary 240 Volts Centre Tapped (110V) and Earth Shielded AVAILABLE WITH I 15/120V SECONDARY WINDING ALSO R.S.C. SUPER 30 MkIII HIGH FIDELITY STEREO AMPI-IFIER BUILD AN AMPLIFIER WORTH APPROXIMATELY DOUBLE THE KIT PRICE INCLUDING CABINET MAINS ISOLATING SERIES Primary 100+ SSp 45p 500+ 40p AD 161/162 60p pair with mica and bushes 25+ 5Sp 500+ 45p 40p 100+ 1000+ SOp prices on application VALVES Also stocked: SEMICONDUCTORS MAINS KEYNECTOR MULTIMETERS ELECTROSIL METAL OXIDE RESISTORS B.R. Carriage via BARRIE electronics MOSCOW ROAD, QUEENSWAY LONDON W2 4AH TeI:O1 -229 6681/2 11 NEAREST TUBE STATIONS: BAYSWATER, QUEENSWAY WW-098 FOR FURTHER DETAILS www.americanradiohistory.com Wireless World, February 1973 a62 t _áyß'^' !. , 410 S a 2 HZ to 20 MHZ SOLID STATE BEAM SWITCH Completely assembled P.C. Board, ready to use on any standard commercial oscilloscope. Size 41' x 31'. £9.25 each. P & P 25p. Completely encased with attenuators and BNC connectors £25.00 each. TRANSISTOR INVERTOR 12V to .5 KV 2 MA AC. Size 12' x 22' x 4 '. £2.95 each P & P 25p. 20 HZ to 200KHZ SINE WAVE GENERATOR four ranges. Wien bridge oscillator, thermistor stabilised, amplitude control. 3 V peak to peak. Completely assembled P.C. board, ready to use. 9 to 15 V supply required. £4.85 each P & P 25p. SINE AND SQUARE WAVE version of above £6.85 each. P & P 25p. In MODERN INSTRUMENTS CASES All aluminium construction, etched chassis with removable blue vinyl cover 1 Small case Size STABILISED POWER UNIT for BC 221 Frequency meter. Slide -in and connect. £3.75 each. P & P 75p. LARGE RANGE OF OSCILLOSCOPES ALWAYS AVAILABLE WRITE FOR LISTS 7/9 with Large case 42' wide, 11' high, 41' deep 2 position tilted hinged rest. 95p each P & P 15p. Size 8' wide, 3' high, 72' deep. Price £ 1.87 each P & P 25p. The advertised Beam Switch & Sine Wave Generator will fit the smaller case. WOBBULATOR For displaying response of 10.7 MHZ (FM receiver I.F.'s) and 30 -40 MHZ (TV I.F. alignment). Requires 6.3V AC and any general purpose oscilloscope. Instructions supplied. Completely assembled P.C. Board. £9.00 each P & P 25p ® LTD ARTHUR ROAD, READING, BERKS. (rear Tech. College) Tel.: Reading www.americanradiohistory.com 582605/65916 Wireless World, February 1973 a63 TRAN N I ES (Formerly C. 24 l Ilp Ilp AL 102 AL 103 AD1611 55p BC 107 BC 108 BC 109 AF114 12p AC126 AC127 AC128 1 AD162f per pr. AFII5 AFII6 I2p 12p 12p AF 117 BCI82L BCI83L BCI84L BC2I2L BC2I4L WOODHILL, HARLOW, ESSEX Hadley Electronics). Telephone Harlow (02796) 37739 R. (No callers please) * 709c TO99 709c DIL 741 c TO99 741c OIL 28p 32p 38p 36p I3p OC71 12p 0C25 0C28 0C29 0C35 0C36 28p 30p 36p 28p 36p TIP31 A TIP32A 40636 2N2926G 2N3053 2N3055 2N3702 2N3703 75p 723c DIL 89p 741c 8 pin DIL 38 748c TO99 42p TTL BARGAINS I0p 7400 20p 49p 7401 7410 7475 11p Ilp 7490 7492 Sp each Unmarked but fully tested. 2N2926G Sp each -9 10 Sp 10 -99 4p 100 plus 3p 25p each plus 22p each AND LOTS MORE. See our price list. 45p 60p 62p Also Super New Cosmos. SPST lop DPDT I2p r a.,r-rr,ro Audiotronic 6 Pole Quadraphonic Decoder This new Audiotronic Decoder is a fully transistorised system to reproduce 4- channel sound from SQ records and 4- channel discrete sources. It performs the CBS SQ matrix decoding function on SQ encoded programme premme material (adopted by the majority of the world's manufacturers), from disc, tape or FM radio. The four signals. when reproduced through four amplifiers and four speakers. will be presented as left. right and front- left and right back information. Switching is provided for: SQ recording and FM Broadcasts. 'Ambient' for enhanced 2- channel sound by synthesizing four channels: normal stereo: 2- and 4- channel record and playback. The master volume control allows overall level to be set plus a rear control for front to back balancing. BRIEF SPEC. Input Imp 40K ohms. Output Imp. 300 ohms. Freq. Rasp. 4Hz 100KHz. Freq. Sep. 60d8. Rear Sep. 20dB. Power Req. AC 240V 50/601-1z. Size 180 (WI r 55 1H) z 220 ID) mm. - Minitron MINIATURE NEON 7 segment indicator Type 3015F 61.50 each Unmarked but fully tested. 2N3055 I -9 12p 12p 12p SLIDE SWITCHES IN4001 -2 -3 I NCO, The new Lasky's NOISE REDUCTION UNIT uses the famous DOLBY '8' system to provide users of semi professional and cassette recorders with a way to increase performance at low tape speeds by reducing tape hiss by 3dB at 600Hz rising to 6dB at 1200Hz and 10dB for all frequencies above 3000Hz. The unit is ideal for replay of pre -recorded tapes and cassettes now being issued in the DOLBY 'B' format. Controls are provided for input levels and noise reduction on record and replay. 2 meters are fitted for instant checking of DOLBY level. Off tape monitoring is provided by the replay input button when used with 3 head machines. Brief specification. Frequency response: 20Hz to 15KHz naB Power LASKYS Signal to noise: better than 70dß (ref 580mV1. Power Signal POSE FREE requirements: 200/250V. AC40/60Hz. Size 15;x 9x 3 }in. INU.K PR /CE u £32 50 58p 69p 55p BARGAIN PACKS Plastic BCI09 (fully tested) ... 723c TO99 Ring for bu k enquiries. 13p LASKYS NEW DOLBY SYSTEM NOISE REDUCTION UNIT SUPER LOW PRICED LINEAR K's 59p 49p 8p 8p 8p 8p 8p 8p 8p 8p TRANSISTORS LOWEST PRICES 0C44 0C45 Xmas311w.-37-s - LASKYS PRICE £22.50 FERGUSON LAMPS of 25 IN4148 Pack 109mA. 230v. 10 P 35p COMPACT SYSTEM The 3414 is or a compact FM stereo receiver fitted with a B.S.R. Auto/ turntable and Goldring G800H cart. Inputs for Tape play and Auxiliary and outputs for tape and headphones. Controls for volume. bass. treble and balance. The FM Tuner section has 5 pre -settable push buttons. Stereo broadcast indicator beacon. SPEC. Power Output 15 watts per channel into 4 ohms. Freq. Reap. 30- 25KHz. Harmonic Dist. Less than 0.5% t 1 KHz. Power Req. AC 120 -240V 50 /60Hz. Size 56.5 IL) s 38 (W) x 18.5 1H) cm. Walnut veneer finish. Complete with pair of The Philips RH.402 Philips RH.402 speakers. Speaknrc include one 7' woofer and one 1' tweeter. Power 20W r.m.s. Philips RH.402 Speakers PACKAGE available separately C at Ferguson 3414 Compact with a pair Manual 110v. Sp each. Sop 3414 c & plus, 4p. WW-056 FOR FURTHER DETAILS £79.00 Be far- seeing protect contacts with ELECIROLUBE Lasky's Criterion Mk. X speakers. LEAK TRUSPEED Mk III £85 Made to ssN for £69.50 A low speed (250 The leading lubricants for electrical contacts. Also Contact Cleaning Strips, Preclene, Silicone Grease, Freezer, Printed Circuit Lacquer. Ask for technical data call Technical Advisory Department if you have a problem. - Electrolube Limited Slough, Bucks., England. Slough (STD 0753) 25574 Tel Leaky, Price of £21.50 pair. r m.) synchronous 12 -pole hysteresis motor 1100 -130V, or 200.250V). gives constant turntable speed Independent of mains voltage fluctuations. Speeds: 333 r.p.m. and 45 r.p.m. Wow: less than 0.15 %. Flutter: less than 0.02 %. Isolated pick-up arm and balanced turntable mounting greatly reduced acoustic feedback. Cast aluminium turntable. The antistatic turntable mat holds all diameters of record correctly and drives them from the rim thus eliminating slipping caused by bowed or warped records. Size: 121in x 15 }in z 73in, inc. cover. COMPLETE WITH ARM, TEAK PLINTH, AND TINTED PERSPEX COVER AND SHURE M75/6 CARTRIDGE. LASKYS PRICE c & P. - £47.50 on walnut base less arm and carsnip for the Hi -Fi Leak Truspeed with cover fridge. A enthusiast. £Z V L(re : EXCLUSIVE TM -5 WW-061 FOR FURTHER DETAILS 5K/ohmsN MULTIMETER DIGITAL DISPLAY MODULES Another pocket multi meter from Laskys providing top qualityand value. The Slimline impact resistant case size 4;x21x1?in fitted with extra large 2-in square meter. Readability is superior on all ranges, making this an excellent instrument for servicing transistorised equipment. Recessed click stop selection switch. Zero ohms adjustment. Buff finish with crystal clear meter cover. Spec.: DCN: 3 -15- 150 -300-1200 at 5K/ohms/V. ACN: 6-30- 300 -600 at 2.5K/ohms/V. DC Current: 0- 300uA. 0- 300mA. Resistance: 0 -10K /ohms. 0 -1m /ohms. Decibels 10dB to 1 6dB. Complete with battery and test leads. NEW RANGE A versatile range of display. counting and storage modules, supplied singly or in multi -digit assemblies complete - with colour filters. Four versions presently available are: 800 -200 DISPLAY LASKYS PRICE (Illustrated approx. full sizel 800 -210 COUNTER /DISPLAY 800 -220 48fT STORE/DISPLAY 800 -230 COUNTER/STORE/DISPLAY All modules connectors. have gold -prated edge Send for full details. CAVERN ELECTRONICS (Dept. 201) 29 CLAREFIELD ROAD, LEICESTER LE3 5FB Tel: Leicester (0533) 857223 WW -062 FOR FURTHER DETAILS AUDIO - JUST PUBLISHED The 111.1 £2.145 C &P.35p ILS 1973 1973 edition of Lasky, famous 'Audio -Tronics Pictorial' is now available. Bigger. brighter and better than ever. Laskys brand new catalógue now contains 48 pages packed with all the latest Hi -h and electronics equipment everything for the layman and enthusiast alike. All the goods shown in the '-Audio -Tronics Catalogue' are available from any of our branches or by Mail Order to any address in the U.K. or overseas. Free on request. Just send your name. address and 15p for post and inclusion on our regular mailing list. -- =.a 207 EDGWARE ROAD, LONDON, W.2. 33 TOTTENHAM CT.RD. LONDON. W1 MAIL ORDERS TO:Oept.WW www.americanradiohistory.com Ra 4245 TOTTENHAM CT. XI el_ 3o RD, LONDON, WI FLEET STREET. LONDON. E.C.4. 3 -15 CAVELL STREET, LONDON, El 2BN Wireless World, February 1973 a64 NNRr3-,frr.,iere;em,A,a*rstoreI BUILD THE 20 -}- 20 (As featured in 'Practical Wireless' May fo August 1972) TEXAN CATALOGUE LATEST EDITION! IN ELECTRONICS? THIS IS A MUST! Fully detailed and Illustrated covering every aspect of Electronicsplus data, circuits and information. 10,000 Stock lines at Special Low Prices and Fully Guaranteed. WATT INTEGRATED I.C. STEREO AMPLIFIER * ,Vg; ;; FREE TEAK CABINET PRICE 'pl' (40p FEATURES. New slim design with 6 - IC's, IC Sockets, 10 silicon transistors, 4 rectifiers, 2 zeners. FIVE 10p * VOUCHERS For use with purchases £20'50 5 BRANDED FROM TEXAS I.T.T. FAIRCHILD Type 1111 12 24 SN7400 20p 20p 20p 20p 18p 18p 18p 18p 18p 18p 27p 27p 190 420 18p 22p 40p 27p 27p 27p 18p 44e 44p 40p 39p 45p 18p 39p 61p 60p 60p 18p 72p 72p 970 8147401 9N7402 8N7403 SN7404 8N7405 SN7406 8N7407 20p 200 30p 30p 20p 45p 20p 23p 920 30p 30p 30p 20p 48p 98p 48p 42p 50p 200 42p BN7408 8X7409 8N7410 BN7411 BN7412 8X7413 8N7416 8X7417 8017420 8077422 SN7423 8077425 8X7427 0N7428 0717430 0N7432 8N7433 0N7437 8N7438 0N7440 70p 13247441AN 8N7442 8N7443 8N7446 8X7448 8N7447 0N7448 0N7450 65p 65p 20p 75p 75p lill 'l'ype 25/99 16p 16p 16e 16p 16p áN7451 SN7453 25p 25p 18p 35p 16p 20p SN7473 .5N7474 SN7475 8017476 SN7480 3150 8017482 87p 26p 25p 25p 8N7483 8N7484 11.00 lep 20p 20p 20p 20p 0X7454 SN7460 5N7470 8X7472 30P 30p 40p 40p 55p 45p 80p 90p 45p 75p SN7486 SN7491AN 1100 8N7492 75p 75p 80p 80p SN7493 SN7494 8N7495 8017496 5N7497 8N74100 8N74104 80774105 80174307 8N74110 80774118 80174121 1100 0200 1175 1160 £200 8175 OL80 1175 1160 £146 11.75 1160 1145 18p 18p 18p 18p 27p 27p 37p 37p 52p 42p 75p 16p 16p 16p 800 90p 70p 850 806 38P 65p 90p 65p 65p 70p 70p 959 8X74122 8X74122 410 70p 95p 700 70p 75p 75p 97p 1100 £826 1660 1600 1220 2230 02.00 1145 1130 1120 81.45 1136 1120 40p 1100 459 70p 95p ß5p 620 610 50p 80p Bop 90p 81.90 ßL79 0109 ßL36 1125 1110 1270 £2.55 1247 90p 95p £100 81.50 11.40 1150 13N74123 80174141 18p 180 80174145 200 PRICES OF 7400 SERIES ARE CALCULATED ON T11E TOTAL NUMBER ORDERED REGARDLESS OF MIX. LARGER QUANTITY PRICES PHONE 01 -402 4891 TEXAS HANDBOOK No. 2LC. 700 PAGES DATA 60p. POST Jests TEST EQUIPMENT SE250B SE500 THL33D TE15 500 200H AF105 U4341 TE20D Selection Pocket Pencil Signal Injector L1.90 Pocket Pencil Signal Tracer E1 50 Robust 2K /Volt £4.S5. With case E4-OS Grid Dip Meter 440 KHz -280 mHz E1345 30 KW Multimeter C1 -5 TE65 L99 ALL Carr. 35p 3' Pulse Scope 1OHz -10mHz E39 STOCK To build MWILW Super het Radio using Mullard RF /IF Module, 600mW o/p. Fibre glass cabinet. All parts £7.98. P.6 P. 32p. (Battery 22p extra.) TUNER ML3 - Superhet MW/LW radio Tuner to build Tuning, SIM Mullard Module etc. ALL PARTS L4 15. P. 6 P. 15p. ALL PARTS SOLD SEPARATELY VISIT OUR NEW ELECTRONICS STORE, 404 -406 Edgware Road, W2. .NENRY'S HI -FI CENTRE 1 to 6) XN3, XN13, GNO 0 -9 side view with data, 85p. GNP -7, GNP -8 0-9 side view with decimal points and data, seg. £2 each, £7 per 4 354 -356 ULTRASONIC TRANSDUCERS Operate at 40kc /s up to 100 yds. Ideal remote switching and signalling. Complete with data and circuits. PRICE PER PAIR £5-S0. Post QUALITY SLIDER CONTROLS stroke singles and ganged. Complete with knobs. 60mm 51702, 101711, 251712, 2501731, 500kS2. I Lin. 40p SC35A 6 10 SINCLAIR PROJECT 60 Z30 £ 157; STEREO 60 PZ6 Lß.37; PROJECT MINIATURE AMPLIFIER each, SL4030D PLESSEY WIRE ENDED Complete with 8 page Data Booklet and Circuits £150. (P.C. Board Stereo 60p; Heat Sink 14p). .5 amp PL4001 PL4002 PL4003 PL4004 PL4005 PL4006 PL4007 50 100 200 400 800 800 1000 6p 7p Bp Op 10p 12p 15p KIT 2517Lí 101712, 50170, 100k 32, 2501,51, Log and Lin ganged. 60p each. MARRIOT TAPE HEADS 4 TRACK MONO or 2 TRACK STEREO £200 '17' High impedance £2 00 '18' Med. Impedance £350 '36' Med. -Low Imp. 75p Erase Heads for above mono -High 2 track '63' £1.75 Impedance '43' Erase Head for above 75p. BZY 50 Sp 100 200 400 600 800 9p 10p 100 12p 15p 16p 1000 FREE IC12 Ref. 36 No. Re- / BO5 /05 81/05 81/10 81/20 81/60 Post 25p L1995 3U0 (0/P AMPS) TRANSISTORS. IC's. DIODES. TRIACS. Send for Stock List Today/ Phone: Quantity prices 4891. Range Sp 6,5p Metal Case All voltages 8.8 -100 Volts 20p each 25+ HIP 100+ 18p 500+ 12p Any one type. 2 Watt 5 %, Plastic 2EZ Range 8.8 -33 Volts 2Sp each. 3 BRIDGES. SCR's ZENERS. LDRS. This advert. contains just a small selection of the thousands of devices kept in stock. W 1i Watt 5% Wire Ends lady 01 -402 Price 1 50 100 805/10 ONE AMP 1x111 MIW 5% Miniature 100+ 500+ Regu- 702C T05 75p 35p 709C TO99 35p 709C D.I.L. 723C T099 LI.00 723C D.I.L. 95p 725C (T099) £4 50 55p 741C T099 55p 741C D.I.L. 747C T099 '£110 LI 10 747C D.I.L. 72741P D.I.L. 110p 72748P D.I.L. SOp £145 NtW BRIDGE RECTIFIERS Any one type. vised LINEAR £1.85 85p 15 Amp (T066) (Plastic) £1-00 BOp T04R (T05) anAq6 3.3 -33 Volt 10p each. 25+ 9p LI40. =111001S Stock List £1.45 25p 40430 40669 All voltages TH9013P -20 watt Power Amp Module £4-S7. TH9014P -IC Preamp L1äO. Data /Circuits for above No. 42 IOp. T048 Additional Types Volts P.I.V. HALF AMP miniature 100k3) meg Log and Sinclair £125 £135 3Amp £125 TRIACS- ZENER DIODES WATT R.M.S. I.C. Also 100 200 400 500 Type 605 transistor. 300mW o/p. Fitted volume and sensitivity control, 9 volt operated. L1.75 each. P/P 150. SILICON RECTIFIERS N4001 N4002 N4003 N4004 N4005 N4000 N4007 85p £1.00 DIAC D32 MODULES 5 PLASTIC 100 200 400 500 II 0 AMP RANGE (T048) SC50A SC50B SC50D SC50E 27Z30 Stereo 60, PZ5 E15.95 2xZ30, Stereo 80, PZ6 E18.00 2xZ50, Stereo 80, PZ8 £2025 Transformer for PZ8 E295 IC12 L1 -10; Q16's L15 pr. Post etc. 20p per item. Type P.I.V. 1 -11 amp miniature 500 AMP RANGE (TOI8) SC45E 11 90p SMALL SIZE AND LOW COST PACKAGE DEALS PZ8 E2 1 5 Transformer for o Active Filter Unit 4.45 Stereo FM Tuner L16.95 3 Hp £140 £120 TUBULAR 250 £4.37 PZ5 £3.07 PZ8 £477 £7.07; Up 400 SC45A SC45B SC45D 15 75p 79p 100 200 SC4OB SC4OD SC40E CREDIT 1ERMS FOR CALLERS. -SAVE POUNDS! rce AMP RANGE (T048) SC40A á4S ,' Pri Price 100 200 400 SC35B SC35D 400 TUBES NIXIE 00 ranges £1750 : Volts P.I.V. AMP RANGE 3 Everything lips PA- Disco-Lighting. FREE Stock List Ref. No. I9. PORTABLE DISCOS-DETAILS ON REQUEST. IC SOCKETS 16 lead 17p 14 lead 15P 8 lead 16p 10p. MW /LW PORTABLE 1260 6240 1225 42.60 1240 1225 140 £35 1270 1340 1325 1270 87174164 1276 2230 /240 80774165 1400 1320 1300 80774166 1400 1360 1300 SN74167 16'25 1520 16'10 8N74170 1440 1355 13.05 80774174 2200 1175 1130 4017417ú 2135 £127 1145 0974176 1160 2135 1120 SN74177 4180 1135 1120 80774180 1165 01-30 1120 80774181 8700 1800 1250 8N74182 £200 1130 11.80 SN74184 1240 £200 01.80 SN74186A 1240 1200 1180 0X74190 21.95 1186 21.76 80174191 1196 8185 8176 11274102 8200 1190 1180 8N74193 1200 8190 8180 8N74194 1260 2E26 81200 SN74196 1160 0170 1180 áN74190 OL60 81.40 2130 8974197 11.50 11'40 1130 8N74198 1460 8370 1385 11X74199 14 60 1370 1336 ffi STUD WITH ACCESSORIES Type tti15 UK's Largest Range -Write Eginiammimiijm phone or call in. Details and demonstrations on request. £275. DJ3OL 3 Channel sound to light unit, 3kw. £375. DJ40L 3 Channel Mic. (Built -in) to light, 3kw. £4895. DJ70S 70 watt Disco amp/mixr £995. DISCOAMP 100 watt amp.lmixer, £375. DJ105S 30 watt Disco amp. /mixer, £150. Anti -Feedback Quality Mic., £4400. DJ500 50 watt PA Amplifier, GROUP 300 150 watt rms 'Group' Valve Amplifier, £9600. PROJECTORS. EFFECTS. FIBRE OPTICS LIGHTING. MILS. SPOTS. DIMMERS- STANDS. MIXERS. SPEAKERS. 90p 11.80 11,70 11.50 lap. íy4, PA- DISCOILIGHTING £135 1127 1120 1200 11.75 11.55 11.55 11.47 1135 11.56 1147 4135 and 24 hour clock circuits. Ref. No. 31 15p. Audio Generator 20Hz- 200KHz £1750 'BAN DSPREAD' 95p 11.10 (Post 15p per 95p. PA- Disco -Lighting 12/24 25199 12 AC /DC Multimeter with transistor tester. Steel case £10.50 RF Generator 120KHz- 500MHz L15.95 IN I with data. With leather case £1050 20 K/V Multimeter £40. With cese L9.SO 50 KIV Multimeter £8 50. With case LI-SO Carr. 50p Valve Voltmeter 28 Carr. 40p NOMBREX MODELS SEG 3015F 7 Carr. 35p TE22D 7 '1 TRIACS BUILD THIS VHF FM TUNER TRANSIS'ORS 300 kc /s BAND- PRINTED CIRCUIT, HIGH MONO FIDELITY REPRODUCTION. AND STEREO A popular VHF FM Tuner for quality and reception of mono and stereo. There is no doubt about It -VHF FM gives the REAL sound. All parts said separately. Free Leaflet No. 3 6 7. TOTAL £8.92, p.p. 20p. Decoder Kit £5.97. Tuning meter unit £1.75. Mains unit (optional) Model PS900 £2.47. Post 20p. Mains unit for Tuner and Decoder P56(12 £325. Post 20p. 1335 1295 12'15 SN74153 8N74154 SN74155 SN74156 8N74157 SN74160 8N74161 SN74162 8N74163 25p 25p 35p 35p 50p 39p 67p 8150 1 8X74150 8574151 lep 1125 1115 11.10 8N7481 lep 0N7490 40p 40p 35p 35p 42p 16p 35p 44p 50p 50p 18p 70p 70p 960 Type 12(24 25199 Send to this address- HENRY'S RADIO LTD. (Dept WW) 3 ALBEMARLE WAY, LONDON, E.C.1. -tor catalogue by post only. All other mail to '303' and callers to '404' see below WIDTH, Why buy alternatives when you article from us at competitive prices from stock? Paid CALLERS) PLUS! Gardeners low field slim line transformer. SPECIAL Fibre glass PC panel. Complete chassis work. QUALITY A STABILITY ARE PREDOMINATE FEATURES KIT HIGH SLIM -DEVELOPED BY TEXAS ENGINEERS FOR PERFORMANCE, DESIGN WITH RELIABILITY AND EASE OF CONSTRUCTION. pPRICE TRIM SILVER FACILITIES. On/off switch indicator, headphone socket, Overall chassis size 45P P separate treble, base, volume and balance controls, scratch and 14t' x 6' x 2' high rumble filters, mono /stereo switch, Input selector; Mag. P.U. CABINET TEAK FREE WITH COMPLETE -head, etc. Tape, Tape for Mic, Aux. Can be altered Radio Tuner, (Parts list Ref. 20 on request). Constructional details (ref no 21) 30p. Designer approved kits distributed by Henry's Radio Ltd. Special INTEGRATED CIRCUITS can buy the genuine 550 FOR Watt Plastic Wire Ends 5% 3EZ Range All voltages 6.8 -100 Volts. 30p each. 10 Watt Stud Mounting 5% All voltages 6.8 -100 Volts. 40p each. 25p 50 100 200 000 2Sp 30p 35p ONE AMP (G.I.) TUBULAR W005 W01 W02 Woo 30p 35p 40p 45p 50 100 200 800 TWO AMPS (H x(Lx* B2/05 821100 132 /200 -11 20p 25p 35 50 100 40p 45p 50p 60p 200 82/600 800 82/1000 1000 FOUR AMPS (H X(Lx f} 84100 B4I200 84/400 100 60p 200 400 415p 84/600 800 £1.00 B8 /100 100 203 400 600 70p 75p 90p SIX AMPS yN X(L X{r B8/200 58/400 58/600 j I 70p E140 SILICON CONTROLLED RECTIFIERS Volts Type P.I.V. ONE AMP CRS 1/05 CRS 1110 Price 1 -11 2Sp CRS 1/40 CRS 1160 50 100 200 400 800 3/05 3/10 3/20 3/40 3/60 50 100 200 400 600 30p 30p CRS 5/400 400 60p CRS 7/100 CRS 71200 CRS 7 /400 CRS 7/600 100 200 60p 65p 70p 95p SCR SCR SCR SCR 100 200 400 600 CR51/20 30p 30p 35p 45p THREE AMP (TO46) CRS CRS CRS CRS CRS 35P 45p 55p 1 Amp T05 FIVE AMP (T0ß6) SEVEN AMP (TO46) 400 600 SIXTEEN AMP 16)100 16/200 16/400 16/600 65p 70p 110p L140 raw III I 3Amp T048 NDON, W. 2. ROAD, LO-402 MAIL ORDER DEPT: 303 RADIO RETAIL SHOP: 404-406 EDGEDGWWARE 8381) ARE ROAD. (01 LIMITED Open 6 days a week 9 am-6 pm Monday to Saturday EDGWARE ROAD, W.2. 01 -402 5854 PA- DISCO -LIGHTING 309 EDGWARE ROAD, W.2. www.americanradiohistory.com 01 -723 6963 Wireless World, February 1973 a65 G. F. MILWARD ELECTRONIC COMPONENTS I 369 Wholesale/Retail Alum Rock Road, Birmingham B8 3DR. Tel. : 021- 3272339 Special Offer ! ! ! MULLARD ELECTROLYTIC CAPACITORS 071 and 072 Series Working Voltage Working Voltage Capacitance Vdc. uF Max. Ripple Current at 50 °c 071 15682 16 16 16 071 15103 16 072 15752 072 15113 071 16222 071 16472 072 16502 072 16752 16 16 25 25 25 25 3300 4700 6800 10000 7500 + 7500 11000 + 11000 2200 4700 5000 + 5000 7500 + 7500 2.4 amps 3.9 amps 5.8 amps 7.9 amps 10.5 amps 13.8 amps 2.2 amps 5.4 amps 9.6 amps 12.6 amps Type No. 071 15332 071 15472 A further 10% discount on lots of 100 of any one type. Type No. Weight 072 17342 072 17502 071 18681 072 18172 Price 15p 17p 1oz 1oz 1?oz 21oz 3oz 41oz 22p 27p 37p 49p 15p 22p 37p 49p foz 11oz 31oz 41oz 106 106 106 106 107 ELECTROLYTIC CAPACITORS 601.0f }200µf 10µf 6 volt 10µt 25 volt 16µf 250 volt volt .. .. .. 300 32µf 275 volt Miniature type. 5µf 10 volt 30µf 10 volt 50µt 10 volt 220µ1 25 volt .. .. .. .. .. .. .. .. . .. ep ep .. lí3p each 320µf 2.5 volt 125µf 4 volt .. .. 4p Both wires same end. .. .. .. .. .. serte 16 I .. .. 10p 13p 18p 25p 30p 20p .. .. .. 0056µt 50 0 -068µf 35 0.068µf 50 0.07µf 20 0.12µt 35 volt volt volt volt volt O.39µ1 35 0.47µf 50 O.68111 35 0.68µf 50 1.5µf 20 It 3.0µf 12 volt volt volt volt volt 3&pí 15 volt 4.7µf 35 volt 5.8µf 6 volt 5.6µf 35 volt 5.6µt 50 volt 20 volt 27µi 35 volt 47µi 50 volt S6µ115 volt 56pí 20 volt 82µf 20 volt 150µf 6 volt 270µf 6 volt .. .. .. .. Plain Fibre Glass Board, copper-clad one side 290mm x 175mm Bakelite Laminate Board, 1 57mm thick 1 sq. foot .. .. .. .. .. .. ri I E VERO-BOARD PACK No. 1 CERAMIC CAPAC TORSS POLYSTYRENE CAPACITORS 100 100 I PACK No. G. F. 2 50 il 100 5 22000 10000 15000 2200 40 63 100 3p each 24p dozen; £175 per 100 15pf 330pí 2,700pí 19,000pf 22pí 470pí 3,300µf 22,000pf 33pí 5600 4,700µf 33,000pf 39pf 620pí 6,800pí 47,000pf 47pí 680pí 8,200pf 68,000pí 68pí 1,000pí 8,500pí 100pí 1,5000f 10,000pí 2200f 2,200pf 15,000pí 3oz 37p 49p 15p 37p amps 7 65p 21oz 10oz 71oz 18oz 51oz 17 amps 12 amps 28 amps 10 amps £1.12 94p £1.79 74p MULLARD POLYESTER CAPACITORS 500,000IN STOCK!!! 0010f .0018uf .0056uf .015uf .0012uf .0022uf 01µ1 .033uf -00154f -0027iif .012uf 0820 20p dozen; 75p-100; £5-1,000; £40-10,000. 15uf .22uf 39uf .82uf 18u1 .68uf 20p dozen; £1-100; £6.50-1,000; £50-10,000 VEROBOARD 2 4in 3;ín x lin X 0.15in Op x 0.1510 16p X 2 In 3 }in X 31ln X 30in X 0.15ín 17in x 2 in X 0.1510 17in x Min x 0.15ín 30ín x 2 1in x 0.1in Tool 48p. Terminal X 2 }in x tin boards and x 31ín X Olin 24p 5in x 21in x 0.1 in 23p 5in x 31in x 0.1 in 20p 28p 55p 51n x 0.15in 20p x 0.1510 20p Spot Face Cutter 38p. Pin Insert Offer Pack consisting of 5 2kin 5in 311n 74P 21p Pins (0.1 or 0.15) 36 for lep. Special Spot Face Cutter-50p. 'ODDS L a .. .. 33p 66p £1.32 .. .. .. 22p 44p .. 45p .. BF 194 .. BFR 64 BLY 89A .. BLY 93A .. Microwave Detector CAY PACK No. L5 £9 10 .. .. .. CL 7331 CL 8380 CL 8470 .. LS .. .. .. .. Microwave Tunnel Diodes AEY 13 .. .. .. AEY 16 .. .. .. R.F. Transistors BF180 il 3 i 7491 7492 7493 7495 5400 6404 .. 20p .. .. AF124 .. £10 .. £40 £5 .. £10 .. .. 10p .. 20p TESTED Li SED TRANSISTORS BC100 ETC. I PACK No. SIGNAL TRACER KIT TRANSISTORISED SIGNAL INJECTOR KIT PACK No. MILWARD, Drayton Bassett, Tamworth, Staffs. .. .. 10p .. 20p .. .. .. .. 6 .. 30p .. .. .. .. .. .. .. .. .. .. .. .. .. LI .. 12p .. .. .. .. .. .. .. 12p 12p 12p p 12p 24p 24p .. 32p .. 32p .. sap .. .. 95p .. 58p .. 78p .. .. 10p .. 58P .. 58p .. 68p .. 10p COMPUTER PANELS R DIODES, TRANSISTORS, INDUCTORS. RESISTORS d PACK No. 1E1 £1 .. LI .. .. .. .. 7 CAPACITORS (ASSORTED TYPES) 6 Postage (minimum) per order 15p. www.americanradiohistory.com . .. £4 .. £10 .. 5 I 4 .. .. .. .. DW 661819 .. TBA 500 Luminance I.C. TBA 510 Chrominance I.C. FEQ 101 64bit Memory.. 7400 .. .. .. 7401 .. .. .. 7410 .. .. 7420 .. .. .. .. .. 7440 7453 .. .. .. 7470 .. .. 7472 .. .. 7473 .. .. .. 7474 .. .. .. .. 7482 .. 7483 .. 7490 .. .. .. .. .. COY 12A Light -sensitive Trans. OCP 70 LI .. .. .. Complementary Drivers, 2 watt (per matched pair) Microwave Gunn Effect Oscillator CL 8370 .. .. .. .. £10 .. CL 8380 .. .. .. .. .. £10 CAPAC TORSS 50 MULLARD POLYESTER CAPACITORS I LI .. .. Microwave Mixer Np PACK No. .. BXY 27128/32/35136137138 /39140/41 OS I .. .. .. Microwave Varactor Diodes SQNS. ODD PIECES VERO .. .. .. .. Infra -red Transmitters CQY11A .. 25p .. LDA 4001403/450;452 .. 10p 10p 10p Transmitting Types BF 194 1E1 10000 Small Signal N.P.N. BC 108 .. 50p RESISTORS CAPACITO 100 DIODES foz 7.8 amps BFS 18R .. NEWER THAN NEW 111 Fibre Glass Board pre- treated with fight-sensitive lacquer enabling you to produce prototype printed circuits within five minutes. Epoxy-Resin 2.1 amps Price TRANSISTORS AND INTEGRATED CIRCUITS Output Transistors Field Effect Transistors BD 112 .. .. .. .. .. 25p BFW 12)13114 OC 36 .. .. .. 50p Micro -miniature N.P.N. BD 145 .. .. .. .. .. 25p . 75mm x 100mm 100mm X 150mm 150mm X 200mm 120 amps 31oz 41oz RECORD PLAYER CARTRIDGES. Well below normal prices) 27µf 6.8µf 20 volt 50 volt 6.8µf 75 volt 12µf 50 volt 22µf 15 volt 22µf 75 volt 18µt 35 volt 68µf .. Weight 91 amps GOLDRING G850 Magnetic Stereo Cartridges, Diamond Needle, £4.75. ACOS 101(Compatible, Crystal) 75p. ACOS GP 9113 (Compatible, Crystal) LI. ACOS GP 93)1 (Stereo, Crystal, Sapphire) £125. ACOS GP 93/1D (Stereo, Crystal, Diamond) L1.83. ACOS GP 9411 (Stereo, Ceramic, Sapphire) L1.SO. ACOS GP 94)1D (Stereo, Ceramic, Diamond) £TN. ACOS GP 95/1 (Stereo, Crystal with two L.P. / Siereo needles) £125. NEWT NEW! NEWT NEW! An aerosol spray providing a convenient means of producing any number of copies of a printed circuit both simply and quickly. Method: Spray copper laminate board with light sensitive spray. Cover with transparent film upon which circuit has been drawn. Expose to light. (No need to use ultra-violet.) Spray with developer, rinse and etch In normal manner. Light sensitive aerosol spray .. .. .. .. .. .. £1.00 plus Developer and Etchent .. .. .. .. .. .. .. .. 50p postage 75mm x 100mm 150mm X 100mm 150mm X 200mm 16 25 ENDS ' -IP sq. in. 3p each volt 100. 15103 16223 17103 18153 10222 MONOLITHIC CERAMIC CAPACITORS TANTALUM CAPACITORS Special offer to clear1-5p each; 50p dozen; £3.50 per 0047µf 20 volt 015µf 35 volt 27µf 15 volt O.056µ1 50 volt 0-22111 50 volt 27µt 35 volt 0033µf 20 volt 0.33µf 50 volt 2.7µ1 50 volt 34003 + 400 5000 + 5000 680 1650 + 1650 ERIE AXIAL LEADS 250µf 25 volt 500µf 25 volt 1,000µf 25 volt 2,000µf 25 volt 2,500µf 50 volt 400µf 40 volt 125µf 4 volt 400µf 6.4 volt 320µf 10 volt 25p 35p 50p 35p 30p 2p .. .. .. uF 40 40 63 63 Please ca,culate the weight of your order and include appropriate postage. for £7.50, 1,000 £50. 1,000µf 70 volt .. 10,000µf 35 volt .. 10,000µf 25 volt .. Vdc. 106 and 107 Series RECTIFIERS 1N4007 1200 peak volts, 30 amps peak current, lamp mean current. 100 2,000µf 25 volt Rev. Max. Ripple Current at 50 °c Capacitance I PACK No. 8 I Wireless World, February 1973 a66 IP]AINIELIIFTE P EXTENSIVELY BY INDUSTRY, GOVERNMENT DEPARTMENTS, EDUCATIONAL AUTHORITIES, ETC. LOW COST OVER 200 RANGES IN STOCK OTHER QUICK DELIVERY USED RANGES TO ORDER CLEAR PLASTIC PANEL METERS Type SW.100 50µA 50 -0-60µA 60mÁ 100mÁ 500mA 1 amp. 6 amp. 16 amp. 30 amp. £3 80 £280 100µA 100-0- 100µA £3 70 £60 500µA lmA £3 40 £340 £240 £340 £340 £340 20V. D.C. 80V. D.C. 300V. D.C. 1 amp. D.C. 5 amp. D.C. £340 2415 2250 £250 ... 100 -0-100µA.. 20011A 500µA 10V. D.C. 20V. D.C. 80V. D.C. 300V. D.C. 18V. A.C. 300V. A.C. VU Meter £280 £2.55 22.55 £256 £2.75 £275 £800 tomA 62.35 500mA 1 amp. 5 amp. 10 amp. £235 .... .... 300V. D.C. 15V. A.C. .... £2 35 £2 35 £235 £236 £236 6V. D.0 20V. D.C. 60V. D.C. £2 56 lmA 1235 50mA 100mA 62'50 22'60 88-6mm x 86mm Fronts £2'85 82.85 5mA £2 50 £2 50 £250 £250 £250 £250 £235 22 36 £2 40 . £285 300V. A.C. VU Meter 12.85 £2.40 . £270 50.0 -50gA 100µA .. 100.0 -10óµA 200ítÁ 600µA 2330 2330 23 20 2310 2310 5000.600µA lmA 1 -0.1mA 1 5 23.10 23 10 5mA £3.10 23.10 23.10 23.10 2310 23 20 23.10 23.10 23 10 2310 23.10 £310 23 15 2395 amp. A.C. amp. A.C. 10 amp. 20 amp. 30 amp. 23 10 E3 10 A.O. 2310 A.C. 23.10 A.C. 23.10 21in. square fronts. Type MR.52P 100µA. 100 -0.100µA 2340 2285 2285 2275 .. 20V. D.C. .. 80V. D.C. .. 22.20 22'20 22.20 2220 500µA 22.55 .. lmA 2220 £220 2220 2220 300V. D.C. 18V. A.C. 300V. A.C. 50µA 50.0.60µA 6mA 10mA 50mA 100mA 500mA 1 amp. 5 10V. D.C. 2220 22-20 2220 amp. 2230 Meter lmÁ 2230 VU Meter .. £350 1 amp. A.C. 2220 5 amp. A.C. 2220 10 amp. A.C. 2220 20 amp. A.C. 2220 30 amp. A.C. 22 20 B £2.20 Type BD.480 50-0-60µA ... 48mm 59.6mm Fronts 500mA 62 16 1 amp. £215 £2 16 6 amp. 10 amp. £2 16 X 62.40 Type MR.85P. 811n. x 85ín. fronts 10V. D.C. .. E3 70 20V. D.C. .. 2300 100µA 60V. D.C. .. 2300 100.0.100µA 2290 160V. D.C. 300v. D.C. 200µA £2 90 15V. A.C. 600µA 22-65 50V. A.C. .. 600-0-600µA 2E-40 1mA 2240 150V. A.C. 300V. A.C. 5mA 22 40 lOmA £2 40 500V. A.C. S Meter imA £2 40 50mA VU Meter .. 100mA 2240 50mAA.C. 500mA 22 40 60µA 62 86 100µA 6226 100-0-100µA.. £2 86 200µA 500µA 1mA .'>mA 10mA 50mA 100mA 6V. D.0 10V. D.C. 20V. D.C. 50V. D.C. 300V. D.C. ... 15V. A.C. .. 900V. A.C. ... VU Meter £2 16 22 15 .... .... .... 62 86 £2.20 6215 6216 £2.16 62.16 . 6216 * MOVING IRON £2 16 2216 £2 62 £2 £2 . 16 30 80 56 - . amp. amp. amp. amp. 15 20 30 60 I3V. ALL OTHERS MOVING COIL . 2255 . 10 amp. 20 amp. 30 amp. £2.75 22-40 . D.C. 200mA A.C. 600mA A.C. 1 amp. A.C. 6 amp. A.C. 22-40 22.40 . .. 2240 .. .. 20V. D.C. .. 50V. D.C. .. 10V. D.C. 15V. D.C. 22-10 2210 21'95 100V. D.O. 150V. D.C. 300V! D.C. 500V. D.C. 750V. D.C. 15V. A.C. .. 60V. D.C. .. 160V. A.C. 300V. A.C. 500V. A.C. e Meter 1mA VU Meter .. 21-80 £1-75 E1-75 . 600-0-600µA 1mA PANEL METERS 21/82in. square fronts. 150mA 21-75 200mA 21-75 300mA 21.75 500mA 21-75 750mA 21-75 1 amp. 21.75 2 amp. 21-75 5 amp. 21.75 10 amp. .. 21-75 2230 100-0-100íW 600í1A 1 1m.1 5mA £17b 2175 2ómA 81-75 ió0mA 81.7b Type 512.05. 31in. square fronts. 1 6 2175 £1-75 E1-75 21-75 E1-76 E1-75 E3.75 E1-75 E1-75 60.0.60µA 100µA 1O0.0.100µ1 200µA 500µA . 5 .. .. .. £2 05 10V. D.C. 20V. D.C. 50V. D.C. 300V. D.C. £1'95 15V. D.C. .. E185 E1.85 El 85 2185 21'85 S lmA 5mA 10mA 50mA 100mA 500mA 50-0-60µA 100µA 22 40 E2 40 £2-40 E2 55 E1 75 E1 85 E1 -85 1mA 1.0.1mA 2185 2185 5mA 10mA 50mA 100mA 500mA E1-85 E1-85 2230 E1 85 21.85 El 85 Excellent quality MODEL 8.280 General Purpose Bench Mounting 27.00 .. 28.05 .. £11'75 1 Amp 2.6 Amp 5 Amp 8 Amp 10 Amp 12 Amp 20 Amp . .. 11590 .. £22.50 .. 223.80 .. £49.88 25 AMP £58' 40 Amp .. 282 50 . . AUTO TRANSFORMERS 0!115 230V. Step up or step 80 W £2 10 £2 70 180 W 300 W £3 80 £6 25 500 W 1000 W 6760 1600 W 61020 2260 W £17 25 5000 W dowi,. Fulh- shrouded. £85.00 P. & P. & P. & P. P. P. P. P. & & & & & P. ldp P. 18p P. 23p P. 93p P. 38p P. 43p P. 60p P. £1 TRANSFORMERS MODEL 8.280 B Panel Mounting 2.5 Amp .. 100 -0-10014A £3 30 £305 lmA 12 86 £2'00 20V. D.C 50V. D.C. 300V. D.C. 1 amp. D.C. £2.85 £2.85 £2.85 £2.85 2200 MCA.220 AUTOMATIC VOLTAGE STABILISER Brand new. 9 sets of changeover contacts at 6 amp rating. 508 each Post 10p (100 lots £40). Quantities available. 2240 22 40 22 40 £240 Type P.E.70. 317/82ín. x 1 15/221n. x 21 im deep. 60µA 600µA .... 23-05 2340 lmA 50.0 -50µA 2330 100µA 300V. A.C. £2.70 23.30 VU 100- 0 -1OOtiA Meter £3.75 2320 2000A .... 23'20 E2 15 E2 16 22'15 E3.40 £2 40 amp. D.C. .. 22.85 300V. A.C. ... £2 85 VU Meter £3.70 6 100mm x 90mm x 108mm. A new range of high quality moving coil instruments ideal for school experiments and other bench applicatione. lin. mirror scale. The meter movement is easily accessible to demonstrate internal working. Available in the following ranges: 1OV D.C. .. 6oµA 2485 2550 100µA 20V D.C. .. eb 10 2485 1mÁ BoV D.C. .. 2485 £485 60. 0.60µA 300V D.C. £4.85 25.10 - 1.0.1mA £4.85 lA D.C. 24 -85 24 85 5A D.C. Dual range 500mA /6AD.C. 5V,50 VD.C. 2510 25.1.0 HAND HELD 2 -WAY £3 97 £4 97 WALKIE TALKIES RP254 REGULATED POWER SUPPLY Solid state. Variable output 0 -24V DC up to 1 amp. Dual scale meter to monitor voltage and current. Input 220/240V AC. Bige 185 x 86 x 105mm. 68.97 Post 25p. PS.200 REGULATED P.S.U. Bolid state. Variable output 5-20 volt D.C. up to 2 amp. Independent meters to monitor voltage and current. Output 220/240 V. A.C. Sise 78 x 61 X 31'. 21497. Post 25p. Solid state. Output 89 or 12 V. D.C. up to VAC or 176Output 120VAC amps. Meter to monitor carrent. In3 or 240VAC. 200VA rating. 211.97. Carr. Sop. put 4' V. A.C. X 85 x 21197. Poet BH.00I HEAD- AND BOOM MICROPHONE . 25P. SET LB4 TRANSISTOR TESTER Moving coil. Ideal for language teaching, com- SMITHS £245 2215 Type ED. 107 22 80 23 70 88 -125 230V/240V 50 mV D.C. £2'15 Bice overall PS.I000B REGULATED P.S.U. Tests PNP or NPN transistors. Audio indication. Operates on two 1.5v batteries. Complete with all instructions etc. 24'50. Poet 20p. 24 62. Poet 15p. RELAYS amp. A.C. 2220 22'20 £215 £8.05 municatlona. Headphone Imp. 18 ohms. Microphone Imp. 200 ohms. 230 VOLT A.C. 50 CYCLES £2 15 E2 20 22 20 SEW EDUCATIONAL METERS 2255 . 250VAC. 2215 2700 .. Please add postage ALL MODELS INPUT 290 VOLTS, 60/80 CYCLES OUTPUT VARIABLE 0 -200 VOLTS Special discounts for quantity Input 22.15 22.15 A.C. 20 amp. A.C. 30 amp. A.C. 50 amp. A.C. VS7 Meter .. £2.15 £2.15 600µA . MW1.8 80mm. square MW1.8 80mm. square Post extra. Immediate delivery Low price 22.15 10 amp. 2215 2245 £215 .... .... 240° WIDE ANGLE ' YAMABISHI' VARIABLE VOLTAGE 2215 22 15 2215 6 22-15 E1.85 21 85 EDGWISE METERS IenA METERS £215 .. 100mv D.C. 22'40 Type 8.80 SOmm Square Fronts 28.60 60µA. 60-0-60µA £8.40 100µA 23.48 . High quality ceramic construction. Windings embedded In vitreous enamel. Heavy duty brush wiper. Continuous rating. Wide range available ex- stock. Single hole fixing, 11n. dia. shafts. Bulk quantities available. 26 WATT. 10 126/60/100/260/600 /1000 /1600 /2500 or 5000 ohms. 90p. P. & P. 10p 60 WATT. 10/26/50/100/260 /500/1000/2500 or 6000 ohms. £1.15. P. & P. 10P 100 WATT.1/6/10/26/60/100 /250/600/1000 or 2500 ohms. 2165. P. & P. l5p .. 60 amp. .. 5V. D.C. .. 10V. D.C. .. 20V. D.C. .. aov. D.C. .. 150V. D.C. 300V. D.C. 30V. A.C. .. 80V. A.C. .. 150V. A.C. 900V. A.C. 600mAA.C. 1 amp. A.C. £245 2215 2215 600-0-50014A 82 55 22-55 22 55 Bend for Ilustrated brochure on SEW Panel 22-60 22-50 100.0.1o0µÄ 600ítA Meter 1rA 22.05 Vu Meter 22.50 1 amp. A.C. 2185 5 amp. A.C. £1.85 10 amp. A.C. £1'86 20 amp. A.C. E1.86 30 amp. A.C. E3.85 E1.85 E l 85 1 amp. 300V. D.C. E1.85 500.0.5001. A .... 2250 2230 £2 30 2205 ,3850 £0 £260 602514A Type MR.45P. Mn. square fronts. 60µA .... £2.15 .... £215 amp. amp. 16 amp. 30 amp. E2 40 22'40 22 40 A.C. 22-40 A.C. 2240 A.C. E2 40 Meters. Discounts for quantities. Please add postage . 100mAA.C. 2240 2240 10amp .... 2240 60ítA 50-0-60µA 100uA £2.30 500601rA 30µA Type MR.38P. 2233.10 20V. D.C. 50V. D.C. 150V. D.C. 300V. D.C. 15V. A.C. .. 300V. A.C. B Meter 1mÁ VU Meter .. 23.95 23'40 23'40 5011A 5V. D.0 12.75 £2.70 £2.70 £2.70 £2.70 £2.56 22-50 £2.50 Type SD.840 100µÁ ... .... 100mA 500mA 1 amp 5 amp 10 amp. 50µA 50-0-6011A 100µA 100-0- 100µA 200µA 600µA 1mÁ 5mA 50 -0 [email protected] VU Meter 82 5mm x 110mm Fronts 10mA £2 60 50mA £2 50 Type 8D.830 504A 300V. A.C. . Type MR.85P. 45in. x 41in. fronts. 100 x 80mm 23.80 'SEW' BAKELITE SYN- CHRONOUS GEARED MOTORS Built-in gearbox. All brand new and boxed. 30 RPH CW; 2 RPH CW; 20 RPH CW; 2 RPH ACW; 30 RRH CW. Sop each. Post 12p. LB3 TRANSISTOR TESTER Teete ICO and B. PNP/ NPN. Operates from 9v. battery. Complete with all instructions etc. £395. Post 20p. www.americanradiohistory.com Industrial quality in robust metal cases. Battery operation. Volume and squelch controls. Call button and press to talk button. Telescopic aerial. Complete with carrying rases. channel 300 mW. 2 i á ° shahs' £ 5 2.50 £ 7 9.50 Poet 5µp. poet bop. HOMER INTERCOMS Ideal for home. office, stores, factories, !!
BRAND AC /DC TAUT SUSPENSIONS HIGH CURRENT THYRISTORS TRANSISTORIZED AUDIO SINE -WAVE OSCILLATOR TYPE G3 -36 MULTIMETERS (Made in U.S.S.R.) BTX47.1000R; 1000V 11.5A... BTX47- 1200R; 1200V 11.5A... BTX48.1000R; 1000V 16A. .. =CON . . . . .. . . £015 . .. .. 40 20 .. .. 4015 AVALANCHE RECTIFIERS . . 1A8029 1000 p.i.v. 1.6A. RA8310AF 1000 p.i.v. 1.6A. . RA8608AF 980 p.i.v. 8A. Please write for full Catalogue. £2 00 £2 50 £2 50 POWER RECTIFIERS BY101 450 p.(.v. 1.1A. BY106 800 p.l.v. 1.1A. BY127 600 p.i.v. Al. Large selection of multimeters with prices ranging from 14.96 to 410.50. .. .. .. . S0ß0 . . . . . . . £0 40 £0 50 . ZENER DIODES watt 5 %, series BZX61: 7.5 to 88V. watts 6 %, eerie, BZX70: 10 to 27V. 6 watts 10 %, series D816: 22 to 47V. 5 watts 10 %, series D817: 66 to 100V. 1 2 Transistorized Audio R -C Oscillator covering a range of 2011z to 200kHz In four decade bands. Calibration accuracy 3 %. Four separate output sockets giving attenuation ratios of 1, 10, 100 and 1000. Microammeter output Indicator. Output voltage 6V into SEE ALSO PAGE 14 FOR OSCILLOSCOPES, RECORDING INSTRUMENTS AND OTHER TEST EQUIPMENT r ! ! 002 OC8 ODI 1Aß 1A6GT 1Aß6 1B8GT 106GT 1040T 1(î80T 1H5GT 1L4 INOGT 0.40 6 %8 0.70 6Y8GT 1,0 523 0.40 6Z4G 040 8/30Lß 046 6Aß8 046 8AB4 0.50 8AC7 046 6AF4A 0.45 BAGS 0,0 8AG7 0.60 MEW 0 66 8AJ8 026 8AK6 0 66 8AK6 1000T 0.60 1R4 060 1R6 184 186 0-45 0.80 0.80 0.80 00 0.70 0.45 8828 0.46 0.75 804 0.86 046 8CB5A 1.60 0.90 OCSE 0.40 0.46 8CD8GA 045 1.80 0.60 8C0î 0.0 6807 046 6CH8 8807 0 80 0.28 8OL8 0.60 8867 0 40 0.46 OCLB 0.80 00Hî 045 8CÚ8 0.80 8877 0 50 0.0 6CW4 0.70 68117 0.60 040 6CY6 0.60 88L7GT 0,0 8CY7 0.75 046 BAL3 048 ßD9 0.66 88N7OT BALO 0.22 8108 0.80 046 CANO 0.87 8DK8 040 88017 0 60 BANS 0.0 BDQ6B 0.76 88E7 0.60 BAQ6 0.42 ßD64 1.26 8887 040 BAQ6 0.70 STO 038 SABO 0.65 6EA8 0.66 8Ú40T 0.70 OARS 0.66 BEH7 0.80 BUIS 0 76 BAR11 1.26 BEJ7 0.65 8Ú8A 048 SASS 0.60 BEWB 0-70 BVOGT 046 8Aß8 0.46 BF6 0.75 8 %4 0 40 ßA870 0.86 8F8G 0.46 8 %6GT 0.46 SATO 0.88 ßF11 0.60 8 %8 0.66 6AU6GTA ßF13 0.50 (M0 0 80 1.26 81,14 0.70 824 0.60 SAUS 0.80 ßF16 0.66 7Bß 0 -76 8AV6GTA 8F17 0.76 7138 0 76 0.90 OF18 0.60 7B7 0 70 6AVB 0.40 ßF22 0.80 7F8W 100 BAW8A 066 8F23 0.90 7F7 1 8A %4GTB ßF24 0.80 7Z4 0 75 0.70 ßF26 1.00 1002 060 BA%60T ßF28 0.70 10D1 066 0.75 80E5 0.0 IODS 066 8840 1.0 60E8 0.90 10F1 0 76 1T4 1T0GT 0 50 1U4 040 lÚ6 0.76 IVS 066 1 %2B 0 66 SAS 0.60 2AP1 8.00 ß026A 0.60 2040 5.00 2061 0 60 2CW4 0 75 2D21 0 40 21122 6.00 2E24 820 2%2 0.60 ßA4 046 ßA6 0.76 3B28 8 O 3BP1 8.60 9Dß 0.86 8137 3D21A 850 81380 00 00 0 6J4 0.0 1OF9 086 BBAO ßJ8 0 0 8.17 0.80 0.46 0.75 0.48 0.45 0.50 0.76 0.76 0.45 0.50 0.60 1.60 0.65 1OLl 813E8 0-65 12AQ6 12AT6 12AT7 12AÚ6 12ÁU7 0.0 0.80 0.28 0.82 0.66 3V4 0.66 8ßH8 0.75 4.126 9.0 BBJB 0.66 4.260A 8BK4B 1.26 14.60 6BE7A 0.75 4-400A 6BL7OTA 16-60 1-00 4THA 0.0 8BN8 0.80 6.0114 0.80 8ßQ6 026 6ß/264M BBQBGTB 2.0 0.80 6B266M 6BQ7A 0.65 8.20 613137 0.0 CP1 6 00 811118 0.76 0 9Q4 0 384 0.40 (MFG 3000T 0.56 D21 600 R4GY 0 75 00 6887 6J50T 0.40 10F1ß 6K8GT 8E7 8E8G 8K8GT 8E23 8E25 81.7 81.18 SLD20 ßM11 8N70T 81.28 ßQ7 6R70 185 682 ßßr8 0.0 084A OUR NEW 1972/1973 0-60 0.66 0.40 0.70 0 0 IOLD110-70 10P13 0 76 11D3 0.0 1116 0 11E2 11E3 4 80 12Aß6 0 70 0 40 12AC8 0 80 12.01)6 0 0 12AH7GT 0.40 12AL6 0.56 0 60 0 40 0 40 0 45 0 88 6 £ 1100 12AV 0.70 30FL1I 1.10 806 0.60 18ÁV7 070 80FL14 0.0 807 120%40Tß SOLI 0.40 812A 8.60 4-00 0.70 SOL16 0.95 813 12AX7 0.88 ß0L17 0.96 829B 4.0 12AY7 0.75 ß0P19 0.90 833A 17 00 1 00 12B4A 0.85 80PL1 0.96 837 12BA8 0.46 SOPL131.10 866A 0.86 4.0 121147 0.60 8OPL141.26 927 12BE8 0.50 SOPL16 1.26 931A 0.40 12BH7 0.50 ß6B6 0.86 966 0.60 12BY7 0.86 3606 0.0 991 8.0 1208 0.40 ß6D6 0.75 4378 8-0 12E1 8.0 8ßW4 0.40 4687 12E14 4.80 3523 0.75 6661A 18.0 6.80 12118 0.86 36Z4G 0.40 5057 6870 0.0 12J6GT 0.85 367.50TO.70 12J7GT 0.0 42 0.0 6761 0.70 1286 1.00 ß0A6 0.80 5763 0.80 6086 0.70 6798 12.00 12K7GT 6006 0.0 6814A 0.70 6842 8,00 60CDBG 12Q7GT0 1.0 6072 0-90 1.76 60EH6 0.06 8080 12807 Ó 8148 1-80 12807 0.45 6OLOGT 128117 0.46 0.0 8146A 2.00 12877 0.0 62KU 0.46 8146B 8.60 1.25 128L7GT 53E11 0.75 8380 0-66 7681 0.0 8883 8-00 0-70 128N7GT 7601 0.50 8922 0-65 80 0.0 8939 2ß6 0.60 12ßQ7 0-60 83 1.86 7026 066 126R7 0.60 86AS 0.56 7199 2O 12 %4 0.50 ß6A8 0.60 7661 ß0D1 0,0 OAG 2.40 7691A 1.0 1-60 20F2 0,70 90AV 2.60 7896 0.46 SOLI 1.10 ß0C1 0.75 9002 0-60 ß0P1 0.50 OCG 2.40 9003 20P3 0,0 90CV 2.40 A1834 0-86 20P4 1.10 10ßC1 0.40 A2298 2ß0 SOPO 1.0 150E2 0.70 AC/HL/DD 070 26LBGT 16088 1.60 0.60 16001 1.60 AC/THI 0 80 26240 0.85 16004 0.06 26ZBGT0.70 306 0.76 AX50 2 60 30Aß 0,0 310A 1.76 AZ31 0 55 9 00 30AE3 0.40 311A 2.00 BT6 30C1 0.0 328A 2.0 C1186 28 00 30016 1.00 929A 2.0 CBL1 0-90 30017 1.10 71ßA 8.00 CBL31 1.0 30C18 0.0 7160 8.0 7-50 30E5 1.00 723A/B 7.0 CL4 30FL1 0.0 726A 25.0 CL33 1.0 60 0 6 PCF88 0.0 PCF87 1.10 PCF200 0.76 PC382010-76 FIRST QUALITY VALVES FULLY GUARANTEED £ EB91 Oßß EBC33 0.0 EBC41 0.66 DANDO 060 EBC81 0.88 0.80 DC90 DF91 0 30 EBC90 0.88 DF92 0.25 EBC91 0.40 DF98 0-60 EBF80 0-40 DH78 0 50 EBF83 0-40 DH81 0 70 DH101 0.70 EBF89 0-88 DK40 0.65 EBL21 DK91 0 46 EBL31 160 DK92 0.70 EC63 0.0 DK96 0.60 EOM 0.0 DL88 1-26 EC88 0-60 DL68 0.70 EC90 0-86 DL91 0-80 EC92 046 DL92 0.40 ECO DL93 0 46 EC8010 226 DL96 0 80 ECC34 0.0 DL98 0 66 ECC36 1.00 DM70 0 00 EOC40 0.70 DM71 0 60 ECC70 lß6 DY61 0.55 ECC81 040 80082 0-88 DY87 0 38 ECC83 0.88 EOCC 1.10 ECC84 0.80 E800F 1.60 ECC86 0-40 E80L 1-10 ECC88 0.0 E83F 1.10 ECC88 0.40 E84L 0.0 ECC89 0.0 E88C 1-90 ECC91 080 E88C 1-10 ECC1890-66 E88CC 070 ECC2000 1.60 F.88CC/01 1.10 ECC8071-0 EOCC 0.46 ECC2000 1.0 EO1H 0.70 E180F 1.0 ECF80 086 E182CC 1SO ECF82 0.86 E188F lß6 ECM 0.70 E188CC 1.10 ECF200 E28oF 2.10 0.86 F.810F 2.0 ECF801 0.0 EA60 0,26 EA62 4 60 ECF804 EABC80 1-65 088 ECH42 0.76 EAF42 0.0 ECH81 0-80 ECHOS 0.46 EAF801 0.60 ECH84 0.46 EB34 0.25 ECL80 0-0 CY31 0-50 DAF91 DAF92 0 30 0 76 00 00 ! 00 HBC91 0.46 ECLB] 060 EL821 ECTA2 0.86 EL822 1.40 HF93 006 ECL83 0.70 ELL80 0.76 HF94 0 46 11E90 0.0 ECL84 0.66 ECL86 066 ECL88 0-40 ECLL800 2.20 EF9 EF38 EF37A EF40 EF41 EF42 EF80 EF83 EF86 EMT EF89 EF91 EPOS EF93 EF94 EF96 EF98 EF97 EF98 EF183 EF184 EF804 EF811 EF812 EF814 EH90 EK32 EK90 EL6 EL12 EL34 ELM ELM EL37 EL41 EL81 EM71 1.0 0.0 EMO 0.46 EM34 EM81 EM84 EM86 0.86 EM87 0-50 EN10 0.86 EN11 070 ENSS 0.26 EN91 0-60 EY61 0.86 EY80 080 EY81 0.28 EY83 0-0 00 087 EY84 £0.25 £0 35 £0 36 £0.35 WHEN ORDERING BY POST PLEASE ADD £0124 IN 8 FOR HANDLING AND POSTAGE. NO C.O.D. ORDERS ACCEPTED. MINIMUM HANDLING CHARGE 10.16 ! 040 61140 040 6BW7 090 0.48 6V4G 0.0 BBX6 0ß6 OÁ40 1.00 6W4GT 066 BB%7GT OB2 OBS watts 10%, series D815: 4.7 to 18V. 20 20 .. .. .. .. SOLD) STATE LIGHT EMITTING DIODES 14V10B T018 outline. Brightness 600 FT -L at 50 mA. Forward voltage. 1.65 to 2V. Diode gives bright red pinpoint of light when supplied from 2V source. Lens diameter 0.170 In. PRICE 40.85. 419.75 60011. OA2 OAS 8 .. 00 0.86 1-0 0.70 8O 6.0 150 0-40 0.40 0.76 0.40 0-55 0.0 0.86 EY86 0.40 028 EY87 0-48 0.80 EY88 0.48 0.40 EZ96 046 Oß6 EZ40 0-60 0.66 EZ41 0.76 0-75 EZ80 0-28 0-80 EZ81 029 0-86 EZ90 0-40 1.26 FG17 6.60 1-00 FW4/600 0-90 0.76 0-0 FW4/800 0.76 0.60 GC10B 4.0 0.82 01/4 1.60 00 HL23 0 HL23DD 0 0 56 HL42DD 0.70 HL92 0 HL94 KT8 2 60 KT38 1 20 KT44 0 70 KT46 2 KT68 2 86 KT71 0 KT78 0 KT88 ß26 KTW81 0 0 0 0 0 1 MEN ME1400 MID MIA 0 0-86 1-80 0.76 MBPEN7 0 0-70 MT17 6 60 MU12/14 0.75 N78 1-0 N8P1 NBPS 60 8-0 PABC80 0 40 0 GR1OM 1.0 PC88 0 1-00 0810C 6.60 PC88 010 060 0810D 8.0 PC22 0-60 0-46 0-60 0810H 4.60 PC98 0-60 0812D 8-00 PCOO 0 48 1.70 G847% 4-00 PCC84 0 40 0.76 GT1C 8.00 PCC86 0 40 66 GU60 8.00 PCC88 ELBE 0.60 GY601 0-70 PCC89 0 60 EL84 0.25 OZIO 0-46 PCC1890 PCC8050 96 EL86 0.48 0231 040 EL88 0-40 0232 0.60 PCC8080 96 0233 076 PCE8000.0 EL90 0.42 GZ34 PCF80 080 EL91 0.40 HABC80 EL96 0.86 0.66 PCF82 0.85 EL380 116 HBC90 0.40 PCF84 0.0 0.0 00 0 00 PY600 1.00 1.1111080 0 40 PY800 0.47 UBF89 0 40 PY801 Oa0 UBL1 0.70 PZ30 088 UBL21 0,70 PCF8001-0 QQV02-8 ßßó UC92 0 46 PCF8010-60 UCCB6 0-46 PCF802060 QQV03.10 126 UCFO 0.70 PCF8060 PCF8080 76 QQVOS-20A UCH21 0-60 686 UCH42 0-70 PCF8080 Q883/3 0.0 UCH81 0.40 PCH2000 0.70 QÚ37 8 60 UCL81 060 UCL82 0-86 PCL81 0 60 QVO8-12 UCL88 0-66 POLOS Oß6 UF9 0.66 PCL89 0.66 QY3-126 900 UF11 0-0 PCL84 0-46 UF41 0.66 PCL85 0 60 QY4-260A 1460 UF42 0.66 PCL86 0 46 UF49 Oß6 PCL88 126 QY4-400A 18.60 UF80 0-85 PCL2000-76 0.0 UF86 0.40 PCL8001.10 R18 UF89 0-40 PCL8010 96 RG9-200A 086 171.41 0.66 PCL8060.0 PD600 1-0 RL18 0.0 UL84 0.48 SISO UM4 1 76 0-0 PEN4DD 0.70 8130P 176 UM84 0.80 BPS 086 UU6 0.76 PEN380 0 70 UY1N 0.0 0.76 8P4 PENIS 0 76 81,81 076 UY11 1.0 UY41 0.48 TP22 0 PEN46DD 0.76 TP26 088 UY82 0.60 PEN48 0.0 TT21 840 UY86 0.40 VLSOS12.80 TT22 60 8 PEN389 VP41 0-76 TY2-120 11.0 VP133 1.00 PEN3840-76 0-76 U18/20 076 V R76/30 0.48 U19 8.0 PEN469DD 0 76 VR106/30 0.75 U20 0.40 0 86 PF88 0 70 U25 U28 0 86 VR160/30 PF818 1 070 0.40 PFL2000-06 U31 VU33 0.76 PL39 0 40 U37 0 46 VU99A 0.76 PL38 0-66 U60 0 40 VU111 076 PL38 0.66 U62 040 VÚ120 1.00 PL81 0.0 U78 0 40 VU139 0-76 PLO2 0.46 U78 PI.83 046 U191 0 76 W729 0-75 0.0 PL84 0-40 U201 0 60 %86 0-60 PL302 0 95 U281 066 %88 PL604 0-06 U282 066 X78M 0-0 PL608 0-0 11301 0 66 %Cil 1.10 PL609 1 10 17403 0.70 %C15T 0-0 PL802 0 96 U404 0.70 %C23 0.90 %C26 0-40 P1.1.80 0 70 PM84 0 86 U801 0.0 XB1-1800 12-00 UABC80 PX4 8 1.0 0.40 Z329 PY31 OS6 PY33 0 68 UAF41 0.70 Z700U 0.0 PY80 0 40 UAF42 0-0 Z719 0.25 Z729 0.80 PY81 0 PY82 086 UB41 0ß6 Z749 0.90 PY83 0 88 UBC41 0.66 Z800U 2-00 PY88 0 40 UBC81 0.46 2803U 1.86 0 0 00 0 0 80 0 0 CATALOGUE IS NOW READY. PLEASE SEND STAMPED AND ADDRESSED QUARTO ENVELOPE FOR YOUR FREE COPY PLEASE NOTE THAT VALVES LISTED ABOVE ARE NOT NECESSARILY OF U.K. ORIGIN Head Office: 44a WESTBOURNE GROVE, LONDON, W.2 Tel.: 727 5641/2/3 Cables: ZAERO LONDON Retail branch (personal callers only) 85 TOTTENHAM COURT RD., LONDON W.2. Tel: 580 8403 A.R.B. Approved for inspection and releue of electronic valves, tubes klystrons, etc. EXPORT PRICE LIST AVAILABLE FOR LARGE SCALE FOREIGN BUYERS www.americanradiohistory.com WE WANT TO BUY: SPECIAL PURPOSE VALVES. PLEASE OFFER US YOUR SURPLUS STOCK. MUST BE UNUSED. TELEX 261306 Wireless World. February 1973 aR7 APPOINTMENTS VACANT DISPLAYED APPOINTMENTS VACANT: £9.00 per single col. inch. LINE advertisements (run -on): 50p per line (approx. 7 words), minimum two lines. BOX NUMBERS : 25p extra. (Replies should be addressed to the Box number in the advertisement, c/o Wireless World, Dorset House, Stamford Street, London, S.E.1.) PHONE : Allan Petters on 01- 2618508 or 01 -928 4597 Advertisements 12 accepted up to p.m.. FRIDAY. FEBRUARY 16th, for the MARCH issue, subject to space being available. Electronics Engineer The major expansion of our Research Department which began last year and will be continuing during 1973 has created a need for an electronics engineer for trouble- shooting, maintenance and some development work. Responsible to the Laboratory Manager, he will provide a service to all of the departments in our new research laboratories where the electronic equipment includes infra -red, ultra -violet, N.M.R. and mass spectrometers as well as chromatographic equipment, calculators and recorders. To these we have recently added a Fourier transform N.M.R. instrument incorporating a small computer. The man we are looking for will be in his late twenties or thirties, qualified to the H.N.C. or possibly degree level and he will have had some experience of service and development work preferably in a multidisciplinary academic or industrial research laboratory. Specific experience in the field of N.M.R. electronics would be an advantage. The person we appoint will be working largely without direct supervision and he should therefore be capable of accepting this degree of responsibility. Roche Products Limited is part of one of the world's largest and most successful pharmaceutical companies and is itself one of the leading companies in the industry in the U.K. Working conditions are excellent and the conditions of service include some valuable fringe benefits. Please apply in writing, quoting reference R50 to Mr. N. Michell, Personnel Officer. Roche Products Limited Welwyn Garden City Hertfordshire 2345 SENIOR ENGINEER required to work on the design of military communication equipments. A knowledge of 'worst -case' design and the use of C.A.D. is preferable; experience in solid state circuit design in the UHF and VHF frequency band is essential. Candidates should possess a degree or membership of the appropriate institution with a minimum of 5 years development experience. Good salary to the right man. Immediate entry to the Company Pension and Life Assurance scheme. Assistance with removal expenses may be considered. Please write, in confidence, quoting Ref. ILF /305 and giving full details of qualifications and experience to Mr. R. V. Ross, The Plessey Company Limited, Ilford, Essex. [2302 ELECTRONIC SERVICE ENGINEER Required to assist in the Servicing, Maintenance and Development of electronic and electro magnetic equipment in a progressive printing company. Formal technical qualifications are not essential, but applicants should have wide experience of press register and drive controls, complex relay logic, computer peripheral equipment etc. A certain amount of light mechanical work is involved. The engineer will be engaged on shift working and enjoy 4 weeks annual holiday, Company pension and sickness scheme. An attractive salary will be paid commensurate with experience. Apply to: Personnel Officer, Hazells Offset Limited, Leigh Road, Slough, Bucks. Tel. Slough 31431 A member of the British Printing Corporation Limited. 12300 www.americanradiohistory.com APPOINTMENTS Wireless World, February 1973 a88 TELEVISION SERVICE ENGINEER Engineers We are an expanding Television Rental and Retail Company with a vacancy for an additional quali- permanently engaged in producing some of the finest sound reproduction equipment in the country for the U.K. and Overseas Markets. service engineer. Suitable applicant will preferable have experience, be colour some the Service responsible to Manager, have a clean driving licence and be eligible for a spacious rent free flat. We now need more Development Apply fied We are Engineers to assist in extending the Company's range of products. : Hydes of Chertsey Ltd. 56/60 Those appointed will be experienced in RF /AF techniques and be qualified to Degree or H.N.C. standard. Self motivation and a determination to succeed in a rapidly expanding company is of equal importance to formal qualifications. Salary will be commensurate with experience. Please contact R.C. Jones Technical Director SNS Communications Ltd , 851 Ringwood Road, West Howe, Bournemouth, Hants Telephone: Northbourne 5331 Television Service Engineer The Stock Exchange, London require an additional Television Service Engineer to maintain information display systems. Applicants must possess appropriate television and radio servicing certificates and must be able to prove their ability as competent Service Engineers by a suitable trade test. An attractive starting salary is offered. In addition, there is a non -contributory pension scheme, 3 weeks holiday in a full year and Luncheon Vouchers. Applications giving brief details of qualifications and experience should be sent to : Personnel Officer, Council of the Stock Exchange, The Stock Exchange Building, London EC2N 1 HP. Guildford Street, Chertsey, Phone: Chertsey 63243 Surrey. 12180 PRINCIPAL DEVELOPMENT ENGINEER experienced on computer controlled or tape sequential automated test systems for a wide range of avionics, communications and electronic products. Candidates should possess a degree or membership of the appropriate institution with a minimum of 5 years development experience. Attractive salary for the right man. Immediate entry to the Company Pension and Life Assurance scheme. Assistance with removal expenses may he offered. Please write, in confidence, quoting Ref. ILC /304 and giving full details of qualifications to: Mr. R. V. Ross, The Plessey Company Limited, 12311 Ilford, Essex. Experienced and Trainee Technical Authors with Electronics or Radio background required. Engineering and Technical Publications Ltd., 45 Friar Gate, Derby, DE1 1DA. Tel. 0332 41261. EAST BIRMINGHAM HOSPITAL TECHNICIANS GRADE IV required for East Birmingham Group electronics section of the Medical Engineering Department. Applicants must be experienced in the maintenance of electronic and electromechanical apparatus. Minimum qualifications electrical or electronic required O.N.C. equivalent. Experience or or engineering knowledge of digital computer techniques and use of solid state logic would be an advantage. Basic salary for the posts commences at LI,317 rising to £1,692 p.a. Apply for application form to the Group Engineer, East Birmingham Hospital Management Committee, Group Administrative Offices, 45 Bordesley Green East, Birmingham B9 5ST. THE STOCK EXCHANGE,LONOON www.americanradiohistory.com 12307 ////////, Wireless World, February 1973 0 d FOREMOST IN THE UNITED KINGDOM APPOINTMENTS MARCONI INSTRUMENTS LIMITED IN CONSTANT TOUCH WITH EVERY EMPLOYER OF EXPERIENCED ELECTRONICS ENGINEERS Our professional placement. service is specialised, confidential and completely free Phone us at any time or write quoting EW 103 `//////// ELECTRONICS APPOINTMENTS LTD 4 DRYDEN CHAMBERS. 119 OXFORD STREET, LONDON, WIR I PA. TEL: 01-434 1861 a89 11-) LOW LIGHT LEVEL TELEVISION An engineer is required to join a small but enthusiastic team to develop C.C.T.V. cameras for low light level systems. Whilst a knowledge of low light level techniques will be very advantageous, it is essential to have experience with cameras and C.C.T.V. equipment. Good starting salary will be offered commensurate with experience and qualifications. Please write with details of qualifications, experience and other relevant information to: Administrative Manager, J. O. Grant & Taylor (London) Ltd., Arlingham House, South Mimms, Potters Bar, Hertfordshire EN6 3PH. ELECTRONIC TECHNICIANS are required to work on calibration, fault- finding and testing of telecommunications measuring instruments. The work is varied and will enable technicians with experience of r.f. circuits tc broaden their knowledge of the latest techniques employed in the electronics and telecommunications industries by bringing them into contact with a wide range of the most advanced measuring instruments embracing all frequencies up to u.h.f. Entrants may be graded as Test Technicians, Senior Test Technicians or Technician Engineers according to experience and qualifications. Our servicing and production programme. geared to our recognised export achievement. provides employment combined with prospects of advancement, not only within these grades. but into other technical and supervisory posts within the Company at Luton and St. Albans. Salaries are attractive and conditions excellent. A Pension Scheme includes substantial life assurance cover provided by the Company. Assistance with removal may also be given in appropriate cases. Please write or telephone, quoting reference WW 173, for application form to: mi Mr. M. Leavens, Works Manager Telephone: Luton 33866, or Mr P Elsip, Personnel Officer Marconi Instruments Ltd Longacres, St. Albans, Herts Telephone: St. Albans 59292 Member of GEC -Marconi Electronics [2328 Experienced Service Engineers required for bench repair printed circuit of boards. Good Salary and L.V.'s. Apply to :Mr. V. Knight, Automatic Business Machines Ltd., Wyfold Road, Fulham, S.W.6. Tel: 385 3311. [2271 Telephone Technician £3400 ... for Roan Consolidated. Mines Limited at one of its mines on the Copperbelt of Zambia. FIELD SERVICE SUPERVISOR A man accustomed to organising and controlling staff in the field is required to supervise our Southern Service Area. will probably be between 25 and years of age and must have previous experience of audio and public address equipment. He will be based at Leatherhead and a company vehicle is provided. He 40 Please write to The Personnel Manager, B.V.C. Ltd., Ermyn Way, Leatherhead, Surrey. Applicants should hold an ONC or a City and Guilds Telecommunications Technician's Certificate and have had at least five years' experience subsequent to training in the installation and maintenance of non -director telephone switching systems. Employment will be on a contract initially for a period of three years. Starting salary will depend on experience and qualifications, but total annual emoluments, including basic salary, allowances, bonus and gratuity will be £3400 - at current rates of exchange. Additional benefits include paid leave which accrues at the rate of 49 days paid return passage for successful applicant and family baggage and settling -in allowances furnished accommodation at low rental free life assurance children's education allowance. Please write (or telephone 01 -606 4839 - 24 -hour automatic answering service) for application form and information booklet, quoting reference ZH.510, to p.a. The Manager, Overseas Appointments, RST International Metals Limited, One Noble Street, London, EC2V 7DA. www.americanradiohistory.com RCM IN ZAMBIA APPOINTMENTS Wireless World, February 1973 a90 ATV NETWORK LIMITED Development Engineers Solid State Circuit Design has a vacancy in BIRMINGHAM for an ENGINEER SOUTH AFRICA A leading international Radio and TV manu- facturer requires three Design Engineers to join the Headquarters staff of its South African operations. They will be responsible to the Director of Engineering and Development, for developing new circuitry (using the latest techniques and methods) improving the performance of radios, amplifiers and other company products assessing new components and materials in the light of their product improvement or cost reduction potential. Candidates MUST have at least seven years' practical development experience of solid state radio receiving equipment and linear amplifiers; and including FM /VHF development work. Experience in the Radio and Television industry would be ideal. An Electrical Engineering degree or Institute Membership is desirable, but not an absolute requirement. The upper age limit is 30. An attractive salary will be negotiated, and there are generous employee benefits. Successful candidates will be expected to emigrate. Applications, which should give full career details, will be forwarded to our client. It is appreciated that there may be certain companies to which you do NOT wish your application to be forwarded. Please list their names in a separate covering note. Please write, quotir.g reference ZH.302, to: I. R. Lloyd at Applicants should possess knowledge of vision and sound distribution and switching techniques, including the G.P.O. distribution network. The successful applicant will be required to carry out engineering / operational duties in CAR /MCR /ST4 'and will have engineering knowledge to enable him to use test equipment and to assess the results obtained. He should also be able to communicate clearly both by speech and handwritten reports. Application Forms may be obtained by writing to :- MSL ADVERTISING SERVICES LIMITED Stratton Street, London, W1 X 6DB HEAD OF STAFF RELATIONS, ATY NETWORK UNITED, ATY CENTRE, BIRMINGHAM BI 2JP. 17 Please quote vacancy number Ill [2287 TELECOMMUNI CATIONS TECHNICIAN to carry out systematic sampling throughout the static transmission system serving the British Army of the Rhine and advise on the correct levels of exchanges and circuits to be provided. Candidates must possess an ONC in Engineering, including a pass in Electrical Engineering A, OR have at least S years' relevant experience. All applicants should have experience in telecommunications traffic analysis and practical experience of at least one of the following: lines and transmission systems: auto and manual exchanges: subscriber apparatus and PBXs: radio station practice involving microwave relay equipment. Starting salary C2,291 rising to L2,797 (plus foreign service allowance of up to £735 p.a.). Prospects of promotion. Non- contributory pension scheme. For full details and an application form (to be returned by 27 February 1973) write to Civil Service Commission, Alencon Link, Basingstoke, Hants, RG21 1JB. or telephone BASINGSTOKE 29222 ext. 500 or LONDON 01 -839 1992 (24 -hour answering service), quoting 1/8150. MINISTRY OF DEFENCE -PROCUREMENT EXECUTIVE [2346 Telecommunications Technicians Electronic Organ Service Engineer required for expanding organ business in Sussex. Good salary and prospects. Apply in writing to SOUTHERN ORGANS (Horsham) LTD. HONEYWOOD HOUSE, ROWHOOK, HORSHAM, SUSSEX. [2309 A hard -headed PRODUCTION ORGANISER AND CONTROLLER for small but busy and fast-growing audio equipment manufacturers -one accustomed to staff and stock control, with all -round technical knowledge. Good salary to person with right qualifications and experience. Apply: Mr. J. Batiste, ALLEN & HEATH LTD., Pembroke House, Campsboume Road, London, N.8 Telephone: 01 -340 3291 [2359 Communications Division of RCA Limited requires additional technicians to help in its expansion programme. The Global candidates will have a background of teleprinter maintenance and assembly and should have experience of Solid State selectors, message heading generators, frequency division multiplexing etc. They must be willing to travel in the UK and abroad and to undertake shift work. AUDIO MAINTENANCE If you are interested in these vacancies, please telephone me for an application form Applicants must be familiar with and able to service and maintain professional sound recording equipment. Applications stating qualifications and previous experience to :- Ideal D.J. Llewellyn, RCA International Limited, 50 Curzon ENGINEER required for large recording studio. THE CHIEF ENGINEER, DE LANE LEA MUSIC, ENGINEERS WAY, WEMBLEY, MIDDLESEX. St., London W1 01-499 4100 Ext. 52 [2296 www.americanradiohistory.com APPOINTMENTS a91 Wireless World, February 1973 INTO THE COMMON MARKET BRENTFORIJ ELECTRIC LIMITED WITH MOTOROLA WE HAVE AN IMMEDIATE REQUIREMENT FOR FINAL TEST TECHNICIANS TO BE GERMANY BASED AT WIESBADEN GRADUATE - Experience in Phasing, Analysing and Testing of Two way Radios in the Frequency Range of 66 -470 MHZ. - MINIMUM QUALIFICATIONS: 1) Ability to troubleshoot Radio and T.V. sets or similar electronic equipment. 2) Experience and knowledge of Transistor Techniques. Excellent remuneration fringe benefits. and working conditions with Knowledge of the German language is not essential as full training course provided. This is an excellent opportunity to join one of the world's leading communications companies. ELECTRONIC ENGINEER Required to augment an enthusiastic team engaged on a variety of Electronic Control Projects associated with Power Regulation equipment. Applicants should be Graduate Electronic Engineers with several years' Industrial experience, preferably with closed loop controls, logic circuits, operational amplifiers, and Thyristor design engineering. Apply to: Personnel Services Brentford Electric Limited, Manor Royal, Please apply in writing, giving details of qualifications and a résumé of career to:- BRIAN S. MUDGE, SERVICE MANAGER, MOTOROLA LTD., 444 BATH ROAD, SLOUGH, BUCKS. W Crawley, 2310 Sussex. Telephone No.: Crawley 27755 SPANISH 2303 Audio Visual COMMUNICATIONS EQUIPMENT Engineer MANUFACTURER Applications are invited from qualified design engineers specialized on: a) Ground /Air Communications b) TV Colour Transmitters c) Side Band Transmitters At least 5 years experience desirable. Company located in Madrid. Salary open. a large company in SEI area, to service Broadcast Vidicon CCTV, tape reinch Video), cine, overand corders (inc. head and slide projectors and film editing equipment. Some relevant experience necessary and City and Guilds Radio and TV Servicing Certificate desirable. Mon.-Fri. Free lunches. Engagement on a 2 -year non -pensionable contract, dependent upon experience, in a range £1,275 -£1,600 pa including required by 1 i London allowance. Send resume to: age and details of previous experience to Box No. 5F/712, c/o Mathers & Bensons Advertising Limited, 12 Sutton Row, London W1V 5FH. Write giving NORTRON Fernando el Católico, 63 Madrid 15 SPAIN [2351 [2349 www.americanradiohistory.com 1111iI APPOINTMENTS a92 Wireless World, February 1973 Kingston Polytechnic Installation CCTV Engineers in STUDIO SUPERVISOR to assist in programme production both on the studio floor and in the control room of a newly established educational TV studio. The person appointed will have had training or experience in studio practice and must also be prepared to pVay his or her part in the practical tasks associated with studio organisation. An imaginative approach and a flare for presen- Thames Television has vacancies for Installation Engineers their Engineering Department. The successful applicants, who will be based at Teddington Studios, will be responsible to a Projects Planning Engineer for the instruction of installation wiremen and to commission a wide range of studio equipment at the Teddington and Euston Studios. Applicants should preferably be educated to HNC standard and must have a basic knowledge of sound and vision techniques in television. tation are essential. Ability to service TV equipment would also be a requirement. Salary will be in the range £1,416£2,205 plus qualification allowance if applicable. Further details and application forms are available from the Assistant Registrar, Kingston Polytechnic, Penrhyn The positions carry a salary of £2,508 per annum plus £120 per annum (London Weighting Allowance). Ir111 Road, Kingston upon Thames KT1 2EE. -549 1366. Candidates are to write giving brief details of age, qualifications and experience to THAMES 01 [2308 Personnel Officer, Thames Television Limited, Teddington Lock, Teddington, Middlesex. REPAIR /CALIBRATION ENGINEERS £1850 to £2000 [2353 If you are an enthusiastic Electronics Test or Service Engineer in a rut come and talk to Jerry Cook about the wide range of Test Equipment you could help us repair and calibrate. Contact: J. D. COOK, CALIBRATION SYSTEMS LTD., CAMBERLEY, SURREY. Tel: Camberley 28121 [2325 CENTRAL ELECTRICITY GENERATING BOARD SOUTH WESTERN REGION 3rd ASSISTANT InterDol (TELECOMMUNICATIONS) Sales Engineer ENGINEER TRANSMISSION DEPARTMENT ELECTRONIC COMPONENTS DURLEY PARK this vacancy is Applications are invited for the above post at Grid Control Centre, Durley Park, Keynsham near Bristol. Applicants should already be experienced radio engineers with sufficient relevant experience to enable him to make an immediate contribution to the development and subsequent control of a large VHF and UHF radio system. N. J. B. Conditions of employment apply and the salary will be either Scale 9, Grade 10 £2,196- £2,712 or Scale 10, Grade 9 £2,331-2,901. In addition a £60 p.a. allowance is paid under the above agreement. Applications on Form SF /1 obtainable from the Personnel Manager, 15 -23 Oakfield Grove, Clifton, Bristol BS8 2AS, should be completed and returned to him by not later than 1st March 1973. 2357 a key position within rapidly expanding company engaged in selling electro -mechanical and electronic components. The man appointed will act as 'link man' between our sales force and our internal operations. He will also conduct telephone selling and answer customers' technical enquiries. It is planned that the man appointed will progress to Field Sales Engineer. Knowledge of basic electrical engineering of electronics essential. a Please write with full details to: The Sales Director, RADIATRON COMPONENTS LTD., 76 Crown Road, Twickenham TW1 3ET [2374 www.americanradiohistory.com Wireless World, February 1973 : A CHANCE Y TO EARN OVER £100 p.w. AND ALL FOUND ELECTRONIC TECHNICIANS are required by a world wide U.K. Company to service advanced equip ment i'n use in U.K. and abroad. Training will be given but successful have probably will candidates theoretical knowledge of electronics up to O.N.C. level and experience in trouble shooting on digital control systems. A willingness to work hard and travel is essential. Applicants should apply in writing to: PERSONNEL OFFICER, B.I.X. LTD., P.O. Box 3, Dolphin House, Stanbridge Road, Leighton Buzzard, Beds. [2298 UNIVERSITY OF LIVERPOOL Electronics Service Engineer to required Engineer Service Electronics service a wide range of electronic equipment used in the Department of Electrical Engineering and Electronics. Applicants should hold C. & G. Certificate in Radio and Television servicing or Electronics Servicing. or must have equivalent training and experience. Initial salary within a range up to E2028 per annum according to qualifications and experience. Application forms may be obtained from the Registrar. The University, P.O. Box 147, Liverpool L69 3BX. Quote Ref. RV /14190/ WW. [2304 AUDIO MAINTENANCE ENGINEER Disco and background equipment. Applicant must have experience in field work. A responsible position for a top man. for P.A. £1700 -E2000 p.a. SATURN SOUND, A.E.M. LTD. Telephone 01 -352 7788. [2378 MEN! £50 p. w. can be yours Jobs galore) 144.000 new computer personnel needed by 1977. With our revolutionary, direct -from -America, course, you train as Pay prospects? a Computer Operator inonly4weeksl (2500 + p.a. - - one After training, our exclusive appointments bureau introduces you FREE of the world's leaders of its kind TODAY, or 'phone to world -wide opportunities. Write without obligation. London Computer Operators Training Centre P14, Oxford House. 9,15, Oxford Street. W.1 Telephone: 01 -734 2874 127. The Piazza. Dept. P13, Piccadilly Plaza. Manchester Telephone: 061 -236 2935 1. 2305 www.americanradiohistory.com a9 3 APPOINTMENTS APPOINTMENTS a94 Wireless World, February 1973 Shore jobs for Radio Officers. If you'd like a job ashore, at a United Kingdom Coast Station, the Post Office will start you off on £1,350 £1,710, depending on age, with annual rises up to £2,310 (compulsory pension contributions are included in these amounts). In addition you would receive payments that can be as much as £300 or more a year for attendances during evenings, nights, Saturday afternoons and Sundays. Opportunities also exist for overtime. There are good prospects for promotion to higher posts. You will need to be 21 or over, with a 1st Class Certificate of Competence in Radiotelegraphy issued by the Postmaster General, or the Ministry of Posts and Telecommunications, or a Radiocommunication Operator's General Certificate issued by the Ministry of Posts and Telecommunications, or an equivalent certificate issued by a Commonwealth administration or the Irish Republic. Find out more by writing to: The Inspector of Wireless Telegraphy, IMTR, Wireless Telegraph Section, Union House, St. Martins -le- Grand, London, EC1A AR. 1 Pod Es= Telecommunications L37 audix MARKETING MANAGER Required by rapidly expanding manufacturing company specialising in commercial audio equipment for the public address broadcast and recording studio industries. The successful applicant must have a basic knowledge of audio systems and be experienced in the use of advertising, public relations and the organisation of a sales office. This position offers a unique opportunity to control all aspects of marketing and to be wholly responsible for the promotion of company products. Please write giving details of qualifications and experience to:- ELECTRONIC DESIGN ENGINEER A rapidly expanding Electronics Company requires an enthusiastic Electronics Engineer to join its design and development department. Experience of electronic musical instruments and synthesized sounds will be an advantage. The successful applicant will have a proven ability in designing for mass production and a broad interest in a variety of electronic applications. Salary range £3- £4,000 p.a. INDUSTRIAL ENGINEER The Company also a proven record of work study and Experience of light knowledge of tool an advantage. requires an Industrial Engineer with success in the application of modern production engineering techniques. electrical assembly is essential and a design and mechanisation principles AUDIX LIMITED Applicants for the above posts should write giving full particulars of experience and qualifications to:- STAN STE D ESSEX. STANSTED 3132/3437 The Technical Director, Dubreq Studios Ltd., 249/289 Cricklewood Broadway, London, NW2 6NX. 2379 12373 www.americanradiohistory.com I 4114 ASSISTANT SENIOR ENGINEERS GRADE I /II BOTSWANA UP TO £3070 + GRATUITY ENGINEER The Benedict House Group of companies has a requirement for a CCTV engineer to assist with their expansion programme. be young and energetic and have experience in the repair of varied types of equipment. The position will be of special interest to those engineers who have ambition and drive. Apply to based on age : MR. M. S. BIRD, BENEDICT HOUSE GROUP, Apply to: CROWN AGENTS, M. Division, 4, Millbank, London, SW1P 3JD BENEDICT HOUSE, ST. DUNSTANS ROAD, and further particulars stating name, age, brief details of qualifications and experience and quoting reference number M2/K/720470/WF. for application form FELTHAM, MIDDLESEX. Or Telephone Required by the POSTS & TELECOMMUNICATIONS Department to install open -wire carrier and VFT systems, VHF /UHF and microwave systems up to 300 channel capacity at 2 GHz. Candidates for the GRADE post must possess the City & Guilds Telecommunications Final Certificate and for the GRADE II post, the Intermediate Certificate, or equivalent qualifications. For either post candidates must be aged 25 -45 years and have had five years experience, excluding training, of the above -mentioned equipment. Experience of single channel HF and VHF systems is also required. * Gratuity 25% total basic salary * Low taxation * Holiday visit passages * Subsidised Accommodation * Education allowances * 24 -36 month tour * Appointment Grant £100 -200 * Free family passages normally payable The post described is partly financed by Britain's programme of aid to the developing countries administered by the Overseas Development Administration of the Foreign and Commonwealth Office. I The successful applicant will Salary negotiable and experience. APPOINTMENTS a95 Wireless World, February 1973 : [2343 01- 751 0044 for further details. [2323 GOODMANS LOUDSPEAKERS LIMITED INTEND TO APPOINT A SITUATIONS VACANT ASSISTANT SCIENTIFIC OFFICER required by The Department of Nuclear Science and Technology, Royal Naval College, Greenwich. The work involves the development, operation and maintenance of electronic equipment for use in teaching laboratories and the provision of assistance to scientific stall. Training and the opportunity for day release are available to a suitably qualified candidate. Candidates must be British Nationals and have GCE with at least four 'O' Level passes to include Physics, Mathematics and English Language. Salary according to age from £681 p.a. (age 16) to £1375 p.a. (age 25) rising to £1590 p.a. maximum. App.ication forms from: Secretary, Royal Naval College, Greenwich, [2289 London, S.E.10. Engineer for WI Area, sound working CCTV knowledge of cameras monitors essential exp. with V.T.R.S. preferred. Salary around £2,000 p.a. Biddle; Dixon CCTV Ltd., 3 Soho Square, London, WI. Tel. 437 8811. [2363 ENGINEERS FOR H.F. and some T.V. Senior to run workshop, customer liaison, etc. Junior to assist above and also home installations. Transport provided. Tunbridge Wells based. Excellent salaries according to experience. Phone John Bryant, Tun[2318 bridge Wells 32153. TECHNICIAN required in Depart- ELECTRONICS ment of Psychology, Reading University. Candi- dates should have or be completing Final City and Guilds in Electronic Servicing, or equivalent qualification, but those with E.T.4 or O.N.C. and special considered. will be in electronics experience Familiarity with electrophysiological equipment or small computers would be an advantage. Salary according to qualification and experience in scale £1398-£1653 p.a. (Grade 3). Apply with particulars of two referees, quoting Ref: T.I30, to Assistant Bursar (Personnel), University of Reading, Whiteknights, Reading RG6 2AH. [2326 LOUDSPEAKER ENGINEER The successful applicant should possess formal engineering qualifications and be between 28 -40 years, with a minimum of 5 years experience in the design and development of loudspeakers. A realistic salary will be paid which will be negotiable dependent on experience, with excel- lent monthly staff conditions. Write stating age and curriculum vitae to the Personnel Manager, Goodmans Loudspeakers Ltd., Downley Road, Havant, Hampshire. A Member of the Thorn Group www.americanradiohistory.com j THORN APPOINTMENTS a'l Wireless World, February 1973 JAPANESE Radio importers require experienced engineers for servicing transistor radios, etc. Part or Full Time. Tel.: 01-628 6157. [2258 RADIO & AUDIO DEVELOPMENT FOR EUROPE PLYMOUTH GENERAL HOSPITAL. A Medical Physics Technician IV is required in the newly established section of medical electronics in the Department of Medical Physics. Duties will include assistance with the maintenance of electronic equipment in the Intensive Care Unit at Freedom Fields Hospital and also maintenance and development of other medical electronic equipment in several other departments of the Hospital. Qualifications-ONC or equivalent. Salary £1,422 -£1,827. Detailed applications, naming two referees (one of whom must be fami:iar with the applicant's technical ability) to the Hospital Secretary, North Friary House, Greenbank The formation of Rank Radio International Limited, incorporating the brand names of Bush, Murphy, Dansette, Leak, Wharfedale, Arena, and Heco, presents excellent career opportunities for qualified and post -qualified engineers. We are looking for the following men to join the Radio & Audio Product Group, based at Chiswick. Development Manager Terrace, Plymouth PL4 8QQ. up to £4,000 pa (Ref: WW1) Reporting to the Engineering Manager, he will control and progress the activities of the development teams with responsibility for technical design. The Development programme must be maintained, necessitating the management of total resources of the laboratory at optimum efficiency. Previous experience of team management is essential, ideally in a mass production, consumer durables industry [2290 'TRAINEE FOR TELEVISION retail business of the highest standing. Good opportunity for keen young man. Write stating age and details of career. Drazin Ltd., 57 Heath Street, London, N.W.3. [2294 WIRELESS TECHNICIANS. There are vacancies at the Home Office Central Communications Establishment and London Region Depot both of which are situated at Headstone Drive, Wealdstone, Harrow, Middlesex for Wireless Technicians to assist with the installation and maintenance of VHF and UHF Systems. Pay £1155 (at 17) and £1715 at 25 rising to £2025. Good promotion prospects. Qualifications: City and Guilds Intermediate Telecommunications Certificate r equivalent. For further details write to: Directorate of Telecommunications, Home Office, 60 Rochester Row, London SWIP IIX. [2371 Engineer up to £3,000 pa (Ref: WW2) will be responsible for the design and development of domestic radio and audio systems, from initiation of the project through to production stage. years' experience in the development of these products He will have 3 for a mass production operation, supported by I.E. R.E. or I. E.E. or equivalent, and will demonstrate a potential for project management. He -5 . Engineer c £2,000 pa (Ref.: WW3) We need to recruit three engineers to work as members of a project team, under the control of a Team Leader or Senior Engineer. Proven ability in the field of circuit design and printed circuit board layouts is essential SITUATIONS WANTED ENGINEER WITH WORKSHOP and delivery facilities seeks electronic asssembly or repair work, salary or contract. Suit small runs or modifications. Corbett, Ivy Cottage, Barham Green, Ipswich. [2319 Please write or telephone for an application form, quoting reference number, to: k6 David Smith, Personnel Manager Rank Radio International Ltd PO Box 596, Power Road London W4 5PW. Tel: 01 -994 6491 RANK RADIO INTERNATIONAL 2354 ARTICLES FOR SALE AARVAK ELECTRONICS. 3-channel sound-light converters, £17, Strobes, £16. Rainbow Strobes, Bedford Avenue, Barnet, Herts. 01-449 £132. -74 1268. [19 Solid state teletype message or code AUTOMATIC Generators to any standard. For details write to: N. A. Walker, Garden Cottage, Chalkpit Lane, Monkton, Hampshire. [2362 H.M. GOVERNMENT COMMUNICATIONS CENTRE has vacancies for ( COMMUNICATION OPERATORS Posts are available entailing watchkeeping on a rota basis providing secure employment with superannuation benefits. There are prospects of service abroad. It Is essential to be able to drive a car. QUALIFICATIONS. Selected candidates will be Invited to Interview and test and will be required to: (a) Send and receive morue at 25 w.p.m. (b) Display knowledge of radio theory, maintenance and repair to the equivalent standard of: PMG-Class I or II The Maritime Radiocommunications General Certificate or III City and Guilds Course 4e. The ability to touch -type on a standard teleprinter keyboard Is desirable. AGE. Candidates should generally be aged 30 or under. I SALARY. Starting salary according to age and experience. APPLICATIONS. With personal details, qualification and experience to: The Personnel Officer (Communication Operators), H.M. G. C.C., Hanslope Park, Near Wolverton, Buckinghamshire. [2272 GIPSY HILL COLLEGE Chief Technician £1,908-£2,205 To head a team in the Educational Aids Department which serves the needs of the whole College. Good knowledge of electronic equipment, including c.c.t.v. servicing, and relevant qualifications, will be expected. There is considerable responsibility attached to this key appointment. Salary within scale according to qualifications. Details ,rom Senior Administrative Officer, Gipsy Hill College, Kenry House, Kingston Flits, Kingston upon Thames. Tel. 01 -549 1141. [2370 www.americanradiohistory.com +OLOUR, UHF and TV SERVICE SPARES. Colour and UHF lists available on request. Varicap /Varactor UHF Tuners ELC1043 £4.50, VHF Varicap Tuners for Band 1 and Band 3 £2.85, Salvaged Varicap Tuners £1.50, incl. Connection Data, P/P 25p. Delay Lines DL20 £3.50, DLl £1.95, P/P 25p. Luminance Delay Line 50p. P/P Hp. Philips G6 Decoder Panel incl. DL1E, Crystal, etc., £6.50, P/P 30p. Also quantity Colour TV Camera panels and asstd. manufacturers' surplus Colour receiver panels. Plessey Colour scan coils £5.75 P/P 35p, Convergence coils £3.80 PIP 25p, Blue lateral £1.25 P/P 10p (or complete set £10 P/P 50p). Mulard type colour Scan coils plus latest convergence coils for electronic control of static convergence £5.25 P/P 35pp Leading Brit. maker Colour LOPT assy. incl. EIlT output and focus control £3.50 P/P 35p. Integrated transistd. decoder unit incl. circuits £1.25 P/P 10p. B9D valve bases for colour valves and PL500 series 10p P/P 5p. UHF tuners transistd. £2.85, incl. slow motion drive, indicator £3.95. Transistd. push button £6.25. Knobs 40p. UHF /VHF basic integrated tuner £3.95. Cyldon UHF valve tuners £1.50; all tuners P/P 25p. Transistd. UHF/ VHF IF panels £4.75 (or salvaged £2.50) P/P 25p. MURPHY 600/700 series complete UHF conversion kits incl. tuner, drive assy., 625 IF amplifier, 7 valves, accessories housed in cabinet plinth assembly £7.50 P/P 50p. SOBELL /GEC 405/625 Dual standard switchable IF amplifier and output chassis incl. cct. £1.50 P/P 30p. THORN 850 Dual standard time base panel £1.00 P/P 30p. PHILIPS 625 IF amplifier panel incl. cet. £1.00 P/P 25p. VHF turret tuners AT7650 incl. valves for KB Featherlight, Philips 19TGI70, GEC 2010 etc. £2.50, PYE miniature incremental for 110 to 830, Pam and Invicta £1.95, A.B. miniature with UHF injection suitable KB, Baird, Ferguson, 75p, Ekco, Ferranti, Plessey push button with UHF injection £1.00, all tuners P/P 25p. New fireball tuners Ferguson, HMV, Marconi £1.90 P/P 25p. Large selection LOPTs, Scan coils, FOPTs available for most popular makes. PYE /LABGEAR transistd. Masthead UHF Booster £5.25, Power unit £4.25 Labgear 'Triset' 3 outlet UHF /VHF distributor amplifier, mains operated £6.50 P/P 25p. MANOR SUPPLIES, 172 WEST END LANE, LONDON, N.W.6 (No. 28, 59. 159 Buses or W. Hampstead Bakerloo and Brit. Rail). MAIL ORDER: 64 GOLDERS MANOR DRIVE, LONDON, N.W.11. Tel. 01 -794 8751. [60 APPOINTMENTS a97 Wireless World, February 1973 BAIRD TELEVISORS. Got one? Want to see it work? Interested in reviving low- definition T.V.? Write 'L.D.T.V. ', 1 Burnwood Drive, Wollaton, Nottingham. [2375 wimp IT in a DEWBOX quality plastic cabinet 2 in. x 24 in. x any length. D.E.W. Ltd. (W.), Ringwood Rd., Fernwood, Dorset. S.A.E. for leaflet. Write now -Right now. [76 CD7115 oscilloscope & trolley £47.50, TF144G r.f. generator £22.50. 10 Ivy Close, St. Leonards, Ringwood, Hants. Tel. Ringwood 5873. [2342 Nr. POR -2 SALE. Revox A77HS; 2 Newmann ConMicrophones + Power supply; 2 Mixers 104; 2 Shure 365 microphones; 1 Akai Stereo portable tape recorder. Please phone M. Sear at CIAV, Durham Road, Boreham Wood, Herts. [2297 01 -953 0291 for further details. denser s' type EM Test Engineers enjoy more variety at Redifon ... and one of the ments best -equipped electronics test depart- Britain. You'll be working on a vast variety of solid -state devices, including high -power transmitters, communications receivers, military pack -sets, MF beacons, mobile HF, marine VHF and teleprinter terminal equipment. The job involves a wide area of testing operations -from GO /NO GO sub -assembly testing through to fault- diagnosis on complex systems. Interesting work with one of the U.K. leaders in electronics in - GLASS FIBRE P.C. BOARD large supplies available. 1/16 in single sided one ounce copper 2p per 3 sq. inches (under 1 it). 75p per sq. ft. (over 1 ft). 1/16 in double sided one ounce copper 1p per sq. inch (under 1 ft). £1 per sq. ft. (over ft). Please add 10p per sq. foot postage and pack1 ing. We can cut to your size at 1p per cut. Solid State Lighting, The Firs, Smallworth Lane, Gar boldisham, Diss, Norfolk. [16 expertise-located in London. To qualify, you'll need to be thoroughly experienced in the field -with considerable knowledge of semi -conductor or HEWLETT PACKARD 185 B Sampling Oscilloscope W / 1ß8A Plug In £45. -G. W. Merriman, [2316 Wandsworth Road, London, S.W.8. logic circuitry. We pay well -from £1,450- f1,750 p.a. (depending on experience) for a 37 hour week with ample opportunities for overtime. Additional benefits include an excellent com- 190 =+ LADDERS, 20ft., £7.80, carr. 80p. Leaflet. Callers welcome. -(Dept. W.W.W.), Home Sales, Baldwin Road, Stourport, Worcs. Tel. 02 -993 5222 order [26 C.O.D. Answer phone installed. pany pension scheme and generous sickness allowances. Please write, including full details of your past experience, to L. Porter, Chief of Test (Dept. P), Redifon Telecommunications Ltd., Broomhill Road, Wandsworth, SW18 4JQ. : LENSES, prisms, mirrors, beamsplitters, telescopes, binoculars, microscopes. 3 }p stamp brings you our 48 page lists. H. W. English, 469 Rayleigh Road, [2147 Hutton, Brentwood, Essex. REDIFON N AE0402 PNP SIL. Planar New 360mW 300 MHZ 1111 600wA, BVc60 60 BVceo 50, 6p each, 250p per 50 Post 5p, Box No. WW 2315. A Member Company of the Rediffusion Organisation 4 t9X) Circuit Board in 6 widths: 2 in., 2} in., PRINTED 3 in., 34 in., 4 in. and 5 in. x any length; 1/16 in. single -sided fibreglass, 2p per 3 sq. in. Double sided 1p per sq. in. P & P 5p per order. SAE quotations for other sizes and quantity discounts.). Knopp, 11 Connaught Gardens, Braintree, Essex, [15 CM7 6LY. Tel. Braintree 25254. RADIO OFFICERS p.o. Type 3000 relays, uniselectors, multi -pin plugs, MTG plates, racks, etc., 50v D.C., large quantity second hand, no reasonable offer refused. The Patten Arms, Winmarleigh, Nr. Garstang, Lancs. Tel. Forton 791484. [2341 PAIR Dynatron L4038 loud speakers. Teak finish. First class condition. £60 the pair. Kingsbridge 2538. [2360 Cossor double beam, excellent condition, SCOPE, £25. Raynor, 35 Derek Avenue, Hove, Sussex. [2329 SOLARTON RESISTOR DIGITAL Test Set mint condition with handbook £40. MPE504 pop tran- sistors 170w hfe 50 min and 15 amps ideal for invertors. Send S.A.E. for lists of component and test equipment at give away prices to 'Q' Services (Electronic), 29 Lawford Crescent, Yateley, Camberley, Surrey. [2314 TEST GEAR: FARNELL, P.S.U.'s MSA, SSB, etc. 20V lA variable or fixed, stabilised and with current overload protection. Nearly new £10. Hartley CT 436, twin -beam 6MHz 10mv sensitivity £70, Orbit f counter 200khz £150. DYTEK, U.S.A., Square wave generator 10MHz, output plus trigger. NORD -MENDE, Distortion Meter £100, Beam Switch £20, A.F. Signal Generator £70, Electronic Millivoltmeter / Multimeter £65, Wobbulators 8 -58MHz £35. Hameg, beam -switch 15MHz £15, Riken -Denshi XY Recorder £250, Green Tx analyser £200. Above are either new or ex-demo equipment and working. Carriage extra. DOWNLAND ELECTRICS LTD., I Church Road, Hayling Isl., Hants. [2306 DO YOU HAVE PMG 1 PMG 11 MPT 2 YEARS OPERATING EXPERIENCE } POSSESSION OF ONE OF THESE QUALIFIES YOU FOR CONSIDERATION I FOR A RADIO OFFICER POST WITH THE COMPOSITE SIGNALS ORGANISATION On satisfactory completion of a 7 -month specialist training course, successful applicants are paid on scale rising to £2,365 p.a.; commencing salary 25 years and over £1,664 p.a. During training salary also according to age by age, 25 and over £1,238 p.a. with free accommodation. - The future holds good opportunities for established status, service overseas and promotion. Training courses commence at intervals throughout the year. Earliest possible application advised. Applications only from British -born UK residents up to 35 years of age (40 years if exceptionally well qualified) will be considered. Full details from: Recruitment Officer (TRO.2.) Government Communications Headquarters Room A/1105 Oakley Priors Road CHELTENHAM Glos GL52 5AJ 92 Telephone: Cheltenham 21491 Ext 2270 www.americanradiohistory.com a98 Wireless World, February 1973 * * ARTICLES CUT THE COST OF SERVIC ING * * FOR SALE WITH LONG LIFE TOSHIBA VALVES LOOK AT THESE PRICES AND MAKE YOURSELF POUNDS MORE PROFIT Type Goods Tax Total DY.87 DY.802 22.0 22.0 6.5 6.5 E13.91 14.5 24.0 25.0 29.5 29.5 27.0 22.5 31.5 33.5 27.0 33.0 34.5 4.0 7.0 7.0 8.5 28.5 28.5 18.5 31.0 32.0 38.0 38.0 34.5 29.0 40.5 43.0 34.5 42.5 44.5 ECC.82 EF.80 EF.183 E F.184 EH.90 PC.900 PCC.89 PCC.189 PCF.80 PCF.86 PC F.801 P. 8.5 7.5 6.5 9.0 9.5 7.5 9.5 10.0 Type Goods PCF.802 PCL.82 PCL.84 PCL.85 PCL.86 PFL.200 PL.36 PL.84 PL.504 PL.508 PL.509 PY,88 PY.S00A PY.800 P. 33.0 30.0 26.5 30.5 30.0 41.5 45.5 22.0 45.0 50.0 80.0 25.5' 50.0 Tax Total 9.5 8.5 7.5 8.5 8.5 12.0 13.0 6.5 13.0 14.5 23.0 7.5 14.5 6-5 23.0 42.5 38.5 34.0 39.0 38.5 53,5 58.5 28.5 58.0 64.5 103.0 Valves packed individually in labelled White boxes Subject to settlement discount 5% of 'Goods' content 7 days and 2% monthly. 33.0 64.5 29.5 New Price List from 11th Oct., 1972. SEMI-CONDUCTORS Price Type Type Price E 0.15 0.12 0.30 0.30 0.20 AC.127 AC.128 AC.141K AC.142K AC.151 0.18 0.16 0.19 0.19 0.17 0.20 0.20 AC.154 AC.155 AC.156 AC.176 AC.187 AC.187K AC.188K AD.142 AD.149 AD.161 AD.162 AF.114 0.45 0.37 0.34 0.34 0.22 0.20 0.20 0.22 0.42 0.37 0.43 AF.115 AF.116 AF.117 AF.118 AF.139 AF.178 0.40 0.40 0.45 0.14 0.10 0.09 AF.180 AF.181 A F.239 BA.145 BC.107 BC.108B Type Price 0.11 BF.173 0.20 0.22 0.22 0.20 0.18 0.25 0.20 0.25 0.40 0.26 0.30 0.08 0.08 0.08 0.12 0.20 0.20 0.10 0.08 0.12 0.18 0.20 0.12 0.12 0.15 0.70 0.45 0.20 0.19 BF.178 BF.179 BF.180 BF.181 0.35 0.40 0.30 0.30 BF.184 0.21 E BC.109 BC.113 BC.116 BC.117 BÇ.125B BC.132 BC.135 BC.137 BC.138 BC.142 BC.143 BC.147A 8C.147B BC.148 BC.149 BC.153 BC.154 BC.157 BC.158 BC.159 BC.173 BC.1788 BC.182L BC.183L BC.214L 80.124 BD.131 BF.160 BF.167 E BF.194 BF.197 BF.200 BF.218 BF.224 BF.258 BF.337 BFY.50 BFY.52 BSY.52 BY.126 BY.127 E.1222 IN.60 OA.91 0A.95 OA.202 OC.71 OC.72 BU.105/02 25C.1172B Minimum Order of i Bp, 14 for El. 2N3055 35p. 2N1613 12p, 7090 25p, 741C 25p, 723C 40p. 5% carbon film R's, E12, 1 p. 75p/100. REED UNITS: 31 reeds mounted round drum, magnet inside. also plugs, R's etc f1 (25p) 2 for £1.65 (35p). Lots of odd units at shop for callers, inc. scopes, oscillators, PSU's etc, etc. Post in brackets, small parts 3p. SAE List. GREENWELD ELECTRONICS (W1O) 24 Goodhart Way. West Wickham. Kent. 01 -777 2001 Shop at 21 Deptford Broadway SE8, Tel 01 -692 2009. (2368 RANK -KALEE WOW ft FLUTTER METERS Excellent condition One or two available at [85.00 each BURGESS LANE & CO. LTD. Thornton Works, Thornton Avenue Chiswick, London, W.4 01 -994 5752/5953 Telephone: Telex : 2358 ISM FES giant FLAN 15V, 331.IF 10V, 470F 6V, 100t& 3V-all at 9p each; for 50p; 14 for £1.00. Special pack-6 off each value (78 capacitors) £600. 440V AC CAPACITORS -0.10F. Size W' X =,' 25p each. 30p each. 050F. Size 11' X } ': 35p 0.250. Size 10 x r: each. 1.OpF. Size 2' X 1': 45p each. 2-00F. Size 2' X 1 ': 75p each. SILICON PLASTIC RECTIFIERS 1.5 AMP-Brand new wire -ended D027. 100PIV at 8p each or 4 for 30p; 400PIV at 9p each or 4 for 34p; 800PIV at 14p each or 4 for 50p. P.E. SCORPIO -10F 440V a.c. capacitor listed above as recommended by the Author for use in place of 2 x 0470F 1000V d.c. discharge capacitors C6 and C7. Improved reliability. Alternatively, 2 X 0470 440V a.c. may be supplied at 35p each. These capacitors are also suitable for systems recently published in P.W. and W.W 5p post and packing on all orders below £5. E4, P.O. V. Attwood) ALRESFORD, HANTS (Formerly BOX 8, 67129 S 6 DEPT 1973 Preston (0772) 56347. Close tolerance capacitors by well -known manufacturer. Good stability and very low leakage. All 63V d.c. 40p; Sop ±2% 30p; 0.471.4F: 61% ±5% 50p; 609 ±1% 1.00F: ±2% t5% 40p; SOP; 2.20F: f5% 50p; ±2% At% 75p 90p; t1% 115p 4.70F: ±2% t5% 70p; 150p 115p; ±1% f2% ±5% 95p; 6-80F: ±2% 1400; t1% 1600 100: ±5% 110p; ±2% 2100; t1% 270p 150F: ±5% 1609; NEW! TRANSISTORS. BC 107, BC 108, BC 109. All at 9p each; 6 for 50p; 14 for £1.00. All brand new and marked. May be mixed to qualify for lower price. AF178 at 42p each; 3 for £1.00. POPULAR DIODES. IN914 at 7p each; 8 for 50p; 18 for £1 -00. IN916 at 9p each; 6 for 50p; 14 for £1.00. 1544 at 5p each; 11 for 50p; 24 for £1.00. All brand new and marked. SPECIAL OFFER -400 MW ZENERS. Values available 4-7, 5.6, 6.8, 7.5, 8.2, 9.1, 10, 11, 12, 13.5, 15V. Tolerance ±5% at 5mA. All new and marked. Price 10p each; 6 for 50p; 14 for MM. RESISTORS-Carbon film } watt 5 %. Range from 2252 to 2.2M63 in E12 series, I.e. 10, 12, 15, 18, 22, 27, 33, 39 47, 56, 68, 82 and their decades. High stability, low noise, -All at 1p each; Sp for 10 of any one value, 70p for 100 of any one value. Special development pack-10 off each value 2.252 to 2.2M52 (730 resistors) £5 -00. TANTALUM BEAD CAPACITORS- Values available 0.1, 0.22, 0.47, 1.0, 2.2, 4.7, 6.8äF at35V, 1011F 25V, 15µF 20V, MARCO TRADING Price Lid, January, CPC, Moor Park Avenue, Preston PR1 6AS, Lancashire - 220 I 3 POLYCARBONATE CAPACITORS Fully tested Fresh stock 12x5x3 in. with 2xECC83, ELM. EZ80 in polished cabinet 14x13x9 in. with 7x4 in. 3 ohm speaker and single fl G PRECISION CASED AMPLIFIERS £3 Chassis motor solenoid operated non -standard tape deck. Low Z 20µV i/p for 2W o/p. Mains operated, tested with circuit. f3 (f1). COMPUTER PANELS: Loads of transistors inc. power types, diodes, R's, C's etc. Some boards broken, but good value at 31b for (25p), 71b f2 (35p). Resistor packs: 300 5% 60p (15p); 200 5% hi -stabs 60p (12p); 100 1 fi 2% 60p (8p); 100 Metal oxide 60p (8p); any 4 packs £2 (25p). CROFON light guide type 1610. 64 filament in sheath. £1 per meter, 5+ 80p, 10+ 70p. 8 assorted panel meters £2.75 (25p). TEST GEAR: Advance CV Transformer, 190 -260V 50Hz i /p, 230Ví 1% 150W o /p. £12 (75p). Advance Voltstat, 0 -260V, also 230Ví 1% 100W £18 (E1). Rotary Xfmr, 23V /p. 530V 450mA o/p f3 (75p) Wee Megger in case £12 (25p). Decade resistance box 0 -9999 ohms f3 (35p). AVO 7 £12 (50p). TF144G Sig. gen. 85kHz- 25MHz. From £12. BC107 -8 -9 0.08 0.15 0.17 0.25 0.35 0.35 0.40 0.28 0.22 0.20 0.25 0.20 0.12 0.30 0.04 0.045 0.05 0.075 0.15 0.15 1.70 2.00 BF.195 12278 [23 01 www.americanradiohistory.com AI Brad New. Money Back Guaranteed. Fan Surin. INDICATORS 5V type. 7 segment 0 -9 DP. socket. & red filter £1.39 LEO type E3. CALCULATOR bet/mains 8 digit. 4 function DIGITAL £39.50. LIGHT EMIT DIODE with panel clip & data 35p. ULSTRASONIC TRANSDUCERS transmit/receive £2. IC GAS. smoke detector siecea £2. hi -fi QUAD AUDIO 4 chan from 2 chan mateeng IC loot zwerl £2.07. AD MAGNETIC CARTRIDGE. 20-20 KHZ. SmV. Diamond [4.19. Dual 1C Preamp £1.67. MC1310P MPX for any FM RX £2.69 KIT £3.45. IC DIGITAL CLOCK: 28 pin. 4 or 6 digit, 12 or 24 hr. £11.49. data 159 complete 4 digit kit with case f21. INTEGRATED CIRCUITS 741 OIL 28p. 709 To5 199 OIL 24.710 33p. 748 33p. 723 599V0LTAGE REGULATOR: 110 5 to 20V £1.67. PHOTO detector /amp. 37p. 74N TTL Gates 74001'2/314/5/10 /20/30/40150 15p. 7413 29p. 7470172 29p. 7413/74/76 37p. 7447 £1.33. 7490 63p. 7492 679 74121 499 14141 T1. SEMICONDUCTORS ZENERS, BZYBB 400mW 11p. 194001 40.1194004 Sp.19914 4.283055409 BC107 8p. BC108 7p. BCt09 9 . FET2113819 289 ACt25/6/7/8 AC127 /8 AC1878. AF117 all 14p. 00161/2 35p. 13C171,.8:9 16p. 50182/314 11p. BC212114 129 BC870 18µ BFY50 /112 17p. TIS43UJT 299 29708 12p 2829267 9p. 293053 189 253702/3/4/51617 119 2143708/9/10/11 9p. CAPACITORS: 25V 10/50/100/200 pF 5p. 1000pF 13p. 22pF to 1pF 3p. FREE CATALOGUE SAE. PEP P.O. BOO 29, ENAMELLED 5.W.G. 10-14 15-19 20-24 25-29 7p. C.W.O. DISCOUNT + 10 10%. BRACKNELL BERKS. COPPER 1lb Reel £1.15 WIRE }/b Reel {Sp ISp £115 Isp £1.18 £1.25 £1.30 £1.40 30-34 35-40 The above prices cover P. & P. in U.K. 7Sp /Op Sap Supplied by INDUSTRIAL SUPPLIES 102 Parrswood Road, Withington, Manchester Tel.: 061- 224-3553 20 33 Wireless World, February 1973 CLASSIFIED a99 Cheapest Available Anywhere EF 80 EV 86'87 PC 900 PL 81 PV 800'81 PC 86 PC 88 25p EF 183 EF 184 ECC 82 ECC 83 PCF 80 EACH PCL 84 PCC 84 OVER 2 EH 90 EBF 80 FREE 30 FL plus EACH plus 1 5p P&P. 5p P &P. OVER PCL 82 POST 3Op 30 PL 13 EACd PCC 89 PCC 189 PAP. PL36 25p PCL 805'85 PLUS 5p OUR ASSTD. BOX 100 OF TOP TWENTY INCLUDES VALVES FROM A, B, and C. PFL 200 MANY OTHERS 2 FREE PCF 805 OVER IF NOT LISTED SEND 30p P.O. POS' PCF 808 SEND PO, CHEQUE or MO to: 2 POST FREE 285 MORLAND ROAD, SOUTHERN MACHINE SERVICES Telephone 01-653 4863 CROYDON, SURREY, CRO 6HE or01- 6560374 235, 'ECONOMISE ON SEMICONDUCTORS -9 10-24 25+ 23p 20p 1099 Can 27p 709C Op Amp 30p 28p 8 or 14 pin DIL 26p 709C Op Amp 70p 65p 82p 14 pin DIL 723C Regulator 32p 29p 8 pin DIL 25p 741C Op Amp 37p 34p 32p 8 pin DIL 748C Op Amp 7441 90p 7476 449 17p 7400, 02, 03 40p 7473 7486 419 16p 7404, 05 36p 7474 7400, 92, 93 70P 7410, 20, 30 17p Hp BC183L 10p IN 4001 BC107 6p BF244B 25p IN4002 8p BC108 Sp 2N2926 BZY88C10p Hp 10p BC109 BC177 12p 2N3055 bhp 3V3- 15V 2N5172 7p BC178 12p P. 6 P. 5p. Return of Post Service. All goods new, full spec. devices. 10% discount for 10+ where not stated. SAE list. 1 Warehouse Must be Cleared Offers Crystals Bargain Mixed J & C types (our choice) I each the following: include of All offers 27. 28, 29, 30. 31, 32 me /s. Offer No. 1: 12 assorted, 69; Offer asorted, LS; Offer No. 2: 25 No. 3: 50 ditto, E15. 2 -pin RACAL type MA 168. Transistorised Diversity Switch. Allows reception of MCW, SSB, RT. CW, or 2 receivers separately or together, receives on twin meters for signal and receiver levels, BFO tuning, phone output, unused in makers' packing L50 only. Data with all linear ICs. Quotations for quantities. 1 41 SILICON SEMICONDUCTOR SERVICES Dunstable Road, Caddington, Luton, LUI 4AL FOR MAINSORPORT- GIEGER COUNTERS ABLE BATTERS watt constant voltage transformers, L18; ditto 125 watt, L8. Triodiac (Variac) Oil cooled transformer 0 -270 35 amp, 128. 240/110 volts 500 KVA, 615. Cossor 1035 Oscilloscopes, L30. AVO Valve tester portable CTI60, £45. AVO Electronic Multimeters CT38, L18. Untested bargains, all clean, TF144 /G, 615; CT53, E10; TF428B/1, L6; CT54, L10; BC221, L12. Enclose extra for carriage, s.a.e., surplus list. Ecdeston St., 72 Prescot, Lancs. [2367 USE) Latest nal Meter scaled 0.1 to 10 milli Rontgenc Hour. a socket is also provided for additional wsound Monitoring on Headphones. uses currant small Transistor i £3.25 incl. postage. RADIO TELEPHONES. Important reference book for users of commercial communications equipment. Includes chapters on installation, operation and maintenance. Price £240 Incl. postage. THE SCATTERING & DIFFRACTION OF WAVES. A gotdmine of information for the experimenter, amateur & scientist. Useful to the student & technician. Profusely illustrated. Published by Oxford University Press. £1.60 MOBILE Meter Bose Rate Portable Trainer No 1. this was used to vain in the use of Gieger Counters. A very compact Gieger Counter. being very sensitive. Radiation indicated on Internal Meter scaled 0 to 3 HontgenslHour X 10 4. Unit contained in Waterproof Alloy Case. which in hand held. Internal Uses Batteries 14 EveryReady 5105 and 112 or - 18 Shaftesbury Street, Leeds LS12 3BT Mail Order Only. C.W.O. P. [86 FULL SPEC DEVICES 40p 68p 95p 03v 98p 78p BEDFORD, BEDS. $D' Discount on 25 +. 88 A P. 7p. 10% .. .. .. .. .. E225.00 All Test Gear includes Securicor delivery U.K. Other Items Please - Carriage send S.A.E. for lists - E5.00 of many interesting items. ELECTRONIC DEVICES 33 NEW ROAD, BRIXHAM, S. DEVON Telephone 0485-3107 or Robophone 51202 [2388 U.H.F. TUNERS 1 New little In or practically no use. Supplied as Canons. Few only í3.50p cart 50p. ROAD, Including Delivery 850 Chassis with UHF Tuner. Ex- rental sets sold complete but unserviced, with repolished cabinets. Rush £7.50 Cash with Order. equivalera makes) Not Supplied. These have had £7.50 Thorn PHONE: BATLEY 7732 SUPPLIES Units and RX/Scanner BBC2 TVs sel,cantained BATLEY, YORKS. Bookseller & Publisher ELEKTRON DECCA TM 45 RADAR 3 CM Complete -Spare R.F. 1 RADIO 86 90 91 92 121 141 B40/41, RX Redifon Solid State Telegraph Terminal Unit 54, Creed Receiver Printer/Paper .. E125.00 - f Available from: 14p 14p 84p 328 42p 38p £38.00 TELEPRINTER STATION EverReady H.P.7 or Equivalent makes) For Mobile useanywhere. (Cost Gov appena each) Supplied Brand New in Canon only f5.5Op can 50p. An Additional DEPT F, 424, BRADFORD 20 40 71 74 76 76 £85.00 MARCONI TWO -TONE KEYER UNIT N7030 230V 50 Hz or4 JOHNS GERALD MYERS (WW) 14p 14p 15p 15p 14p 25p £17.00 MARCONI MASTER OSCILLATOR N 7021, 1 MHZ and 100 KMH Output Frequency Std. 230v 50 Hz .. .. This World Radio Bulletin (ask for sample 74N SERIES TTL. E39.50 EDGCUMBE PEEBLES 500v MEGGER, Solid State, Leather Case Probes.. .. .. .. .. .. a Radio Batteries (4 Mallory Long Life RM12 - HOW TO MAKE WALKIE- TALKIES FOR LICENSED OPERATION. Only 40p ncl. postage. GOVERNMENT SURPLUS WIRELESS EQUIPMENT HANDBOOK. Contains circuits, data, illustrations for British/USA receivers transmitters, trans /receivers. With modifications to sets and test equipment. Latest impression 00 01 04 05 10 13 £55.00 AVO TEST SET MULTI -RANGE No. 1, High Sensitivity, Brand New. Ever Ready Case Leads .. .. .. is housed in £90.50 .. AVO CT 446 TRANSISTOR ANALYSER, Battery Power plug in Power Unit far Laboratory use. operating from 100 120 volts or 200 25O volts A.C. Mains is available. Supplied Brand New In Carton at only f2.50p Frost 25p Headphones (Not necessary) if required 50p. ESSENTIAL BOOKS Extra postage for abroad. Solid State n e strong IightAlloy carrying Haversack with case. placed shoulder strap. Containing Cable and Hand held Probe, Instruction Card, plus the latest plug in Vibrator Power Unit. Which Instrument f70 post free. Fortnightly copy) £3.13. Home Office release and probably the last. of this well known Contamination Meter No I, this very useful Instrument is used far the measurment of Radio -Activity. Indicated on an Inter- 3 CASEY BROS., 2327 WAYNE KERR CT 492 L.C.R. COMPONENT BRIDGE, NEW & EX EQUIPT VALVES & TRANSISTORS TO CLEAR £0.15 12AT7. 12AV7. 6CB6. 6AL5, 606 6SL7. 6BC4, 64K5. PC4. 6A05, 6AV6, 5U 4G. 6AG 5. 5675. 68N6.6AL5. BCY31, EIFY77, BC21 1, 2N711, £0206205. 5703. EL34. EF55, EF94, 5642, 5R4, 5Y3, 6AS7, 6H6. 607, 6V6. 6X4, 61(7. 61(8. 12AX7. CV4018, 1616, 611, 6205. 5896. 0A3, 0C3. OB2. V746A, 6021, 5814A, 35C5. 2X2A. 1N255, 2583, 2 -25A. SAV5. £1.00 25T, 8020. 6533. 5675. 1N23E. £1.50 5876. 2C53, 5876. £2.00 2ASt5. GL6299. £0.50 5784, 5718. CRC83. 1N82A. Amperite Ballast Types 9 -4. 3 -14, 10 -4C. Heiipots ST 5K. 5686, 5840. 6AN5. 6844 -A. £3.00 6280. Reflex Klystron VA2038/6975 8.5-9.6 MHZ: £0.75 Helipots 107 10K. BFO oscillator No 8 £7.50. P. & P. 5p per single valve and 1p for each additional, Enquiries invited to clear complete stock. Box No. WW 2380. www.americanradiohistory.com For Ferguson 850, 900 Chassis, but adaptable for most DISTD Chassis. £2.50 each, C.W.O., postage Included. Send S.A.E. for list of TVs, Tubes, Valves, etc. Allow 10-14 days delivery. TRADE DISPOSALS Midlands & North: 1043 Leeds Road, Bradford 3 Scotland: Unit 5, Peacock Cross Industrial Estate, Burnbank Road, Hamilton Cornwall: Pencoys, Four Lanes, Redruth CARBON FILM RESISTORS High Stab. 'LW or PA/ 5 %. 1p, 55p/103, £4/1000 (22t2 -2M2) Eis RESISTOR KITS 1062 -1M E12 SERIES: 10E12KIT. 10 of each value (Total of 810) £2.80 25E12KlT. 25 of each value (Total of 1525) £6.50 FREE CATALOGUE ON REQUEST Metal Film 1W 5%.11; £11100; £7- 50/100 15E12 Kit (10E2-1M) Total of 915 £7 -25 C.W.O. P. & P. 10p on orders under £5. Overseas extra. BH COMPONENT FACTORS LTD. Dept. WW., 61 Cheddington Road, PITSTONE, Leighton Buzzard, Beds., LU7 9AQ. (2382 CLASSIFIED Wireless World, February 1973 a100 V.A.T. will be charged by the government from April 1st on all purchases of AUDIO MIXER UNITS, MODULES and P.C.B.'s both in kit form or ready to use. We regret this is now causing delays on delivery which will increase as the time approaches. PARTRIDGE ELECTRONICS will not charge V.A.T. on any order received before this date, and executed afterwards. If you are not familiar with our latest range of products, and would like our 1973 catalogue, write to us at:23-25 HART ROAD, BENFLEET, ESSEX PARTRIDGE ELECTRONICS