RADIO TELEVISION and HOBBIES JUNE, 1964 Vol. 26

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JUNE, 1964

RADIO Vol. 26 No. 3

RADIO, TELEVISION, TELEVISION HI Fl, ELECTRONICS, and HOBBIES AMATEUR RADIO, POPULAR SCIENCE. HOBBIES.

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- > PAGE II RADIO, TELEVISION & HOBBIES JUNE, 1964

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ItADIO, TELEVISION mid HOBBIES ABC CERTIFIED CIRCULATION IN EXCESS OF 41,000

Volume 26, Number 3 June, 1964

u Editor: SHADOW" LICENSING NEVILLE WILLIAMS /"'OADED into action by repeated complaints M.I.R.i.E. (Aust.) (VK2XV). of malpractice, various groups in the radio- Technical Editor; television service industry have recently been ex- PHILIP WATSON (VKJZPW) ploring means of restoring public confidence by A.M.I.R.E.E. (Aust.). identifying, accrediting or licensing individual Technical Staff; servicemen. JAMIESON ROWE 6.Sc. (Tech.) Grad. I.R.E.E. (Aust.) One such prominent group in Victoria, the KEITH JEFFCOAT (VKJBX) "Electrical & Electronic Servicemen's Licensing KEITH WOODWARD (VK2IAU) Committee," has issued a circular indicating that JOHN DAVIDSON (ViarjE) their planning is now complete and that they are ROBERT FLYNN ready to process applications and issue "volun- tary" servicing licences. They state that it is not Advertising: their intention to deprive any practising service- SELWYN SAYERS, Mgr. man of his current livelihood and that "unquali- BILL SUMMONS, Rep. Sydney fied but operative servicemen may continue work- GIL O'NEILL, Rep. Melb. ing in the industry under a temporary permit." Circulation; It is not surprising that this last sentence has W. CUMMING, Mgr. evoked a reaction . . . "how very, very generous of them." Personally I have no reason to doubt the motives of this committee Subscription Rates; but I do have serious reservations about its apparently precipitate approach. C'vealth, FIJI, N. Guinea, The point is that this committee, in common with other such groups, United Kingdom and British Dominions £A2 p.a. has no present legal standing. It cannot justifiably talk about "licensing" Foreign CA2/I0/- p.o. and certainly not about permitting people to continue in the industry on a "temporary" basis. Even without the legal implications, this last phrase Editorial Offices: 12th Floor, 235-243 Jones St., presents difficulty enough. How temporary? Until they die, or must Broadway, Sydney. Phono 2-0944. servicemen, under pain of ultimate exclusion, go back to learn at a desk Ext. 2531, 2525-6-7. what they've already learned in the field? Advertising Offices: There is another important aspect of this matter. If it is all right Blh Floor, 235-243 Jone. St., for one non-government group to issue "licences" and "permits," then Broadway, Sydney. Phone 2-0944, surely it is all right for any other to do likewise. The pattern is being Ext. 2931, 2508, 2510. set for opposition groups to issue their own licences, their own permits Circulation Dept.: and their own identifying photographs, which can be as impressive in 9th Floor, 235-243 Jones St., Broadway, Sydney. Phone 2-0944. appearance as the occasion demands. This puts the whole thing right Ext. 2505, 2509. back where it started, except that the public will be called upon to evaluate rival documents as well as rival servicemen! Postal Address: Box 2728, G.P.O., Sydney. (Re Meanwhile those individuals who are disinclined to conform to "un- technical queries, see "Answers official officialdom" will presumably suffer, because they lack documents To Correspondents" page.) which they are not legally required to hold. -Melbourne Office: "Radio, Television and Hobbies" has no special stake in the question 392 Little Collins St. Phone of licensing—either for it or against it. It certainly has no reason to op- 67-8131. pose any group activity aimed at stamping out malpractice. However, it does believe that there should be only one authority by which licences Cover Picture: should be issued—or seem to be issued—namely the Government itself. The aircraft industry might appear to bo quite distinct from the electronics industry, yet the two are becoming highly interdependant. Sig- nificantly, this nest of powerful jet motors was photographed at the power plant factory of the General Electric Company at Evendale, Ohio, In This Issue: U.S.A. As a matter of interest, aircraft style jet turbines are The Automatic Factory 4 20,000 Ohms/Volt Multimeter 56 proving their usefulness for power generation, because of Colour Flight Simulation 9 Basic Radio Coursa 61 their ability to be put Into Welding Hoir-Sixed Wires II A Reader Built It 70 operation at short notice to Telegraphy — Part Three 12 Audio Topics 75 meet heavy peak loads. Review—Probing Dolphin Classical Review 77 Speech 17 intarctate Dlitrlbutors: Variety Fore 81 Distributed In N.S.W. by Sungravurt Ply. Review—Medical "Pod" 19 Trade Reviews, Releases 89 Ltd.. Mejitmoro Avenue, Rotebery. N.S.W.; in Victoria by Sungravure Ply. Scientific and Industrial News 21 Amateur Band News, Notes 93 Ltd., 392 Little CoIIIqs St., Melbourne; TV I Problems—Part Two 28 ' In South Australia by Sungravure Pty. Listening Around the World 101 Ltd., 104 Currlo St., Adelaide; In Western More About Transistor Ignition 33 Answers to Correspondents __ 105 Australia by Western Press; In Queeni* land by Gordon and Gotch The Serviceman Who Tells -- 37 Book Reviews 109 (A/asia) Ltd.; in Now" Zea- land by Truth (N.Z.) Ltd; In A Simple Mantel Set 41 Classified Advertisements 111 Tasmania by Davies Bros. « Let's Buy An Argument 51 Index to Advertisers 112 Ltd.; "Mercury," Hobart. ■ INSTROL-

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Radio, Television & Hobbles, June, 1964 3 1. TOWARDS

Figure 1: The Bromborough Com- pound Mill of the British Bxtracting Company Ltd., manufacturers ol animal leedslufls. The blending control panel (left) accurately weighs the correct proportions of each In- gredient In each food. Details of every m operation are automatically recorded on paper tape. Flashing lights plot progress and the system is sequence- interlocked to prevent errors. ' * p. commerce. The most versatile means of integrating mechanisation and control is the, computer. Taken to its limit, this marriage of a mechanised manufacturing cycle and fully-automatic control leads to a system that accepts raw materials and delivers— and perhaps distributes and sells—the finished product without human intervention. In large measure such a system How far off is the "push-button" factory? For oil could be built, for certain types of product, using existing techniques and refining and some chemical manufacture it is equipment. already with us. But the more elaborate the product, Just how complex the design and operation of a "pushbutton" factory would the greater are the technical problems and costs be for nearly all manufactured goods is not. however, well appreciated. of automation, and factories highly automated For the purpose of examining their by today's standards still require a large payroll. adaptability to automation, we can di- vide manufactured goods into four cate- 0.._NE of, the.. most powerfulf and far-, ..than making,. use of. .information , .. ob-. gories^ continuous (I) liquids lengths and gases.of solids,(2) solids. and reaching ways in which technology tained from the manufactured article or (4) assernblies. The difficulty of auto- can benefit everyone is through the material itself (that is, from instruments mat^g their manufacture increases in disputatious medium of automation. Few in the plant) to correct errors in the (he same ortier. Each, therefore, is worth philosophies—for a philosophy automat- way it is being made—see Figure 2. considering individually to develop a pic- ion undoubtedly is—have aroused so Fof instance, it may be a means of ture 0f the complexities of automation, much discussion in so brief a period as detecting a broken or blunt drill and re- Liquids and gases.—Materials are the decade since an American. John Die- placing it. or a system that automatically most easily handled in these slates: a bold, coined the word. Few popular analyses a continuous flow of liquid and continuous flow, the first requirement of philosophies are simpler and more logi- keeps its composition constant. automatic manufacture, is readily cal in principle—yet few more misundcr- Many familiar analogies, often of long achieved when the material is a liquid stood. standing, exist of the feedback principle. or a gas. Moreover, it is a relatively "Automation" is a word that from the governor invented by James straightforward matter to apply the tech- epitomises much of current technological Walt to control' the speed of a steam niques 0f automatic analysis to measure progress; it also has considerable emot- engine, to the thermostat that controls an

ish Petroleum's refinery at Belfast, where from the blending control panel by a By David Flshlock a computer will record information that single operator. can be used automatically to The same attention is now being paid "optimise" the entire refinery's opera- to the handling of very coarse, granular in the pattern of suitability of materials tion; that is, to arrange its activities to materials, including coal and iron ore. for automatic manufacture is reached provide the maximum output for mini- As Mr G. F. Fiennes, Chief Operating with continuous lengths of material, mum cost. Officer of British Railways, told a sym- notably of metals, electric and telephone Granular materials. —From liquids posium in London recently: "By good cables, and paper. Here again the prob- we pass to powders and then to lumps luck or judgment railways are no longer lem of handling is simplified by the of material: and the complexities of thinking about carrying consignments of absence of any need to orientate the automating their manufacture — a word five million tons (of coal) in egg-cups product, which takes the form of a flat I now use in the widest sense, to em- of 20 tons. Railways are thinking in sheet or strip, or a lube or rod; more- brace the mining and transportation of terms of the train; the train composed over, the product, for all practical pur- coals and ores, for example — increase certainly of a locomotive, waggons and poses, is homogeneous. rapidly with the "coarseness" of the perhaps a brake van but a train which The steel industry, which has revolu- material. remains continuously coupled through- tionised its practices throughout the Powders are only a step removed from out its hours of service. This is a funda- world in the last decade, and is a large liquids in fluidity and homogeneity; an mental change in thought." and very wealthy business in a number automatic flour mill was in existence Continuous lengths.—A further stage of industrialised countries, seems ripe to make extensive use of automation. n Already about 10 computers are being r-* used for process control in British steel mills, and a steel mill in Detroit has r been partly under surveillance by com- T> puter for about three years. Another, in Pennsylvania, has a blast furnace that is i programed and charged by instructions from a punched paper tape; it will eventually employ its own process computer. r But probably the most advanced example of automation in a steel mill is * to be found making steel sheet for motor car bodies and refrigerators at the Spen- cer Works of Richard Thomas and Bald- wins, at Newport (Figure 3). Its 68 inch- wide hot rolling mill is designed for full automation, from the reheat furnaces - for 20-ton steel slabs to the coders which coil up sheet steel. A system of computers, the first of which is now in operation on the hot- strip mill, controlling such factors as A the temperature at which the steel is rolled and the final thickness, Figure 4 (above): Tfi/j olcctro-pneumatie assembly machine de- will eventually program and control the signed, built, and developed by Vauxhall engineers, is one of entire mill, which is three miles long, two which, between them, can assemble telescopic shock absorb- from blast furnace to coilers, setting and ers at the rate of 1300 per hour. adjusting the rolls and correcting any departure from specification in the mate- Figure 3 (below); The control console for a fix-stand finishing mill trial. at the Spencer Works of Richard Thomas and Baldwins. The finish, Assemblies.—To apply automation to ing rollerman is in the foreground, tho speed controller seated. the manufacture of an assembly of dis- as early as 1830. Such materials will flow through a pipe or along a conveyor and can be mixed and blended almost as easily as liquids; the idea of "fluidising" a powder by agitating it with a flow of gas has helped still more. X Many consumer products, from ferti- lisers to foodstuffs and soap powders, OOo - are made, inspected, packed, weighed and counted by highly automatic techniques in a sequence that one can visu- WZf alise as linked directly with the "super- market" system of distribution. assg.. An advanced example of mechanisa- c tion for a "granular" product, although not, in this case, a computer-controlled plant, is a new mill opened by the Uni- lever subsidiary, the British Extracting Company, to make animal feedstuffs. From a total of about 80 raw materials, those needed to make a given feed- i stuff are selected, weighed, blended, x cooked, shaped and cooled, and finally y.P At-.'■ packaged in an entirely automatic se- rf quence. Figure 1 illustrates the blending stage, in which a battery of auto- i m tv4 matic weighing machines are controlled Radio, Television & Hobbies, June, 1964 Automatic Factory — Continued To provide for all reasonable requirements a control unit needs a certain minimum number of Crete parts of even the simplest pattern is much the most complex task. In the controls. It is essential, however, that their function first place, each part of an assembly and purpose are immediately obvious. must be made to close tolerances to Every control on the QUAD 22 fills a basic and permit assembly. Secondly, the parts essential purpose, and moreover its caption indi- must be handled and orientated to per- cates exactly what it does. Send a postcard for mit their assembly in the correct sequence and in the prescribed manner. the booklet describing this unit in detail. Thirdly, the product is no longer homogeneous — and is much more susceptible to design changes. For simplicity, one can reduce the manufacture of an assembly such as a motor-car engine or a radio into three stages: manufacture of the individual parts, assembly, and test. Up to a point, remarkable strides have been made towards automating each of the stages, especially in motor car, radio and television factories. Computer control of machine tools, a technique poineered in Britain by the Fairey-Ferranti milling machine for aircraft parts, is gaining acceptance slowly, but the application rarely goes beyond a single machine or type of machine in a production line. Russia has had an "automatic" factory since 1956. capable of making 1.5 million bearings a year — but it uses no computer-controlled machines. An American firm, In- ternational Harvester, however, has a computer-controlled "transfer machine" for making cylinder blocks — the first it is believed. MECHANISATION The assembly of parts by automatic methods is, perhaps, the example most often cited of "automation"; in fact, from our narrower view, it is simply mechanisation — albeit of a most complex type. Some highly ingenious machinery has been developed to assemble television sets, transistors, valves, electric light bulbs, windscreen wipers and fountain pens. Larger and even more complex machines, the success of which relies largely on the ingenuity which the designer can exercise over the handling and manipu- lation of each part, are beginning to reach the motor industry. Renault, in France, has been especially adventurous in developing machines and techniques for the automatic assembly of a motor car. The outcome has been a number of ungainly and possibly quite uneconomic assembly machines from which, however, its production engineers are gaining unique experience mmMm of the problems of the future. None of these machines is yet computer-control- for the closest approach J led. to the original sound Vauxhall Motors, too, has developed a number of automatic assembly machines (see Figure 4) and has also pioneer- Sole Australian Agent: ed the linkage of machine tools and assembly machines into "linked lines," BRITISH MERCHANDISING PTY. LTD. with a continuous flow of parts from one to another. This approach is an ex- 60 Clarence Street, Sydney. mm 1• tension of the "transfer machine" tech- 29-1571 ![ 1I would like to obtain more informationinformal 1I nique used by the motor industry for I many years to make large components on Quad Equipment. 1I such as cylinder blocks. 1I Automatic testing techniques are mak- For illustrated leaflets and NAME |' ing rapid progress, particularly in the 1j electrical and electronics industries; it is prices, please post this ADDRESS 1 coupon. J usually quicker and easier to check an STATE 9' J electrical circuit than a mechanical as- J■ sembly. Many advanced examples Radio, Television & Hobbies, June, 1964 of automatic testing machines are now in Figure 5. A digital computer programs and controls every stage in this eleven- use, for products ranging from adding station, 7 70ft long production line for carbon film resistors at Western Electric, machines to golf balls, from transistors U.S.A. A memory drum retains details of a whole month's production needs, to matches. and all test data from the three iminspection stations are compared on a statis- There have also been tentative at- tical basis with informationinfi in the memory. tempts to link testing and manufac- Â. Computer J. Second inspection station B. Output-input control1 station K. Encapsulating station r-fi, ,£ ?•'C. ssr.Sr.r'"Coating station L. Leak detector station wdgh, ,„d checks JJ. dimensions of. £ SKftSSS „„„„ M. Marking station connecting rod in three seconds; f its E Terminating station N. Third inspection station holes are misaligned the rod is switched p. Conveyor control equipment O. Packing station straighten?JanMlner it.it me assemblv Pmach- GH-' ^HelixinaPP'n99 stationstation Q.P. ConveyorCap-lead weldingcontrol equipmentmachine But like automatic assemhiy macn Q. Cap-lead welding machine*++****++++ mes — automatic test equipment is costly and can rapidly become obsolescent all is running smoothly if the man can designer may choose to eliminate a with changes in product design. pass his time so nonchalantly. costly or unreliable mechanism. As far as true automation is concern- None the less, far more Again, there is comparatively little ed there is virtually no evidence of its "sophisticated" and advanced types of experience yet of very complex control use by the metalworkmg industries yet. control systems are to be found in de- systems, other than for military The peculiar difficulties that face the fence systems employing aircraft or and space purposes where the standard electronics industry, in the question of missiles, in spacecraft and in nuclear of reliability achieved is unlikely to im- reliability and of the rapidly diminish- reactors. Such techniques, if employed press the manufacturer, ing size of its wares, makes it likely that jn the manufacturing industry, would Most advanced industrial control sys- the more spectacular applications of take it a huge stride nearer the "auto- tems seem to have experienced painful automation will first appear here. In matic factory." Why are they not used? teething troubles — with the upshot, fact, the production line illustrated in The reasons are not hard to find 'n some cases, that the manufacturer Figure 5 is an excellent example of the Automation appeals to managements hf settled for a less ambitious level shape of things to come in production • th_ • f / fniir fpWpr ofha S automationU r ChaS d fromA CCOUI thetants equipment can he engineering , , .f , , i - f l hardly This sk«ch is of a production line at er la^t utilisation and-no trivial relish he idea of exchanging unskilled Western Electric, U.S.A., that makes factor _ prestige. The safety of people, fssembly-line. operators . for sizable carboni-tarHrsn rooicrrxrcresistors torfor 11COuse in satellitescarpllitAC at a overwhelming• *. . T consideration*. ¥in *air- . ' toomcteams r\tof maintenancemamtAnonno ortctmoorcengineers, rate of 1,200 an hour. To achieve the craft or nudear power smUons need But 8reater experience with complex standards of reliability and quality be unpemost Fn Z aeneFal mû control systems' t08ether with 1116 deemed minimal for this purpose the facturer's Jnind when he is assessing the Sreater reliability that seems likely from resistors are untouched by hand ^ând ^nefTo? autom^T 5 new "solid-state" manufacturing tech- throughout the entire, complicated mques for electronic, pneumatic and manufacturing sequence. Each of the 11 The cost of a fully-automated plant hydraulic circuitry, should make an im- separate operations is under the direc- making use of the latest advances in pact jn the next f]Ve or ten years, tion of a digital computer. control techniquess woulda be extremely Where advanced systems are found Why so slow?—As I have tried to 8 '. , . eapital outlay chjefly is in the newer industries, such show, there are some very advanced would have to be justified in terms of as 0j] refining an(j f00(j processing, and eaxmples of mechanisation, and a few anvar adequate- 15 and assured market for the jn the generation and distribution of of the true automation, to be found in y ?? ". much more likely to be e]ectrjc power. Often they are fast-ex- factories around the world today; and justified in a steel mill or a fertiliser panding industries with a reputation for Britain can boast her share of them. A factory than in a motor car factory, innovation. The steel industry, which recent estimate puts the number of com- where the product is redesigned every jjas revolutionised its practices in the puters being used for process control year or two' past decade, promises to become throughout the world at 440. Of these, Some managements have tried and another major customer, but there is about 200 are in the U.S.A. and Canada, been disillusioned by automation, and no comparable trend in the fabrication and about 23 in Britain. one reason has been over-enthusiasm— of other metals. Automation is, however, coming in an attempt to automate too much at And in production engineering, where far less rapidly than many people think, once. If the reliability of a single opera- the most complex problems of all are to With a handful of exceptions, factories tion in a complex sequence is suspect, be found, and which has spawned some that are highly "automated" by today's the entire project may be jeopardised, remarkably ingenious techniques for standards still require a large payroll, at enormous cost. By employing the fashioning, handling and assembling and There are factories in Britain where the combination of highly developed facul- inspecting articles, the overall picture is most familiar sight is a workman read- ties that the human being has to offer still one of a oomparatively primitive ing the newspaper — and his employers —at an inspection stage, for example, level of automation, with computer con- are perfectly content; they know that or to perform a tricky alignment — the trol applied only to individual machines. Radio, Television & Hobbles, June, 1964 7 SELEX ADEPT

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■iv

Flight Simulation rt,

i; Details of the Redifon* Full Colour Simulator Equip- ment which has recently been sold to N.A.S.A. for Research Purposes. THE Flight Simulator Division of Redifon Ltd., a British company, has been awarded a contract for the supply of a full colour visual simulator attachment by the United i m s States Government National Aeronautics and Space Admin- y istration. for installation at the Ames Research Centre, Moffet Field. California, U.S.A. The equipment will be used, in conjunction with a large 4 research analogue computer already installed at Moffet Field, for general investigations of take-off and landing problems i and. more specifically, for investigations of V.T.O.L. aircraft techniques, carrier landings and supersonic transport charac- i teristics. Similar colour visual presentation equipment is being ki manufactured for attachment to the two Redifon VC10 flight simulators for British Overseas Airways Corporation. 0 Since the time that simulators were first recognised by airlines and Air Forces as being essential aids to the training of aircrews, manufacturers of flight simulators have striven to achieve complete realism. Although this ultimate stage can never be reached on the ground, a great deal of research has been devoted to improving existing techniques and developing niw ones, with the result that flight simulation has now reached a high standard of fidelity and realism. The vidicon colour camera mounted on its tracking Thus a modern, fully operational flight simulator covers gantry before the three-dimensional coloured model of all aspects of aircraft operation from crew entry to debrief- the airfield and its surroundings. ing, including prc-flight checks and taxi-ing. Emergency conditions are faithfully simulated including "engine out" operation with the associated asymmetric flight, wet starts, flame- This latest development—from black and white visual out and re-lights. It is worth noting that emergency situations presentation to full colour simulation—is perhaps even more can be simulated which it would be hazardous in the extreme important. Redifon are convinced that only a colour visual to introduce in actual flight on a crew training operation. simulation system can provide a pilot with the correct visual cues and this belief is reinforced by many authoritative or- ACCURATE ENVIRONMENT Panisations including the Institute of Aviation Medicine at Flight controls, instruments, and navigational aids asso- arnborough. The colour system enables pilots under train- ciated with the particular aircraft being simulated are correct ing to recognise objects and judge heights and distances in in "feel," layout and operation. Even the smell is the same! the natural way by shape, size and colour during the critical The simulator equipment is dssigned for use as a training stages of take-off, final approach and landing. device to enable aircrew to undertake conversion courses, The Redifon colour visual system can be supplied as proficiency checks, operating procedures and emergency drills an integral part of a new flight simulator installation or as and all these exercises from the elementary through to ad- an addition to existing equipment. It consists of a full vanced levels may be completed under instrument flight con- colour, closed circuit television system and a three dimen- ditions until the members of the crew are completely fami- sional coloured model of an airport with its surrounding liar with the cockpit layout, performance and handling countryside. characteristics of the aircraft. The model is 38ft long and 10ft high covering an area In addition, the simulator may be equipped with a fuse- equivalent to 7.6 miles long by 2 miles wide; the model lage motion system which is hydraulically actuated and re- scale being 1 in 1,200. Actual operating area is 30ft by 6ft, produces yawing, rolling and pitching sensations of sufficient representing a distance of 6 miles long by 1.2 miles wide. magnitude to add a further degree of "realism" to training This allows, for example, a 1.5 mile runway plus 2.5 miles manoeuvres. for approach and 2 miles for take-off areas. The figures The advantages of the simulator are obvious. Although can, of course, be varied as required. an expensive beast, its cost per hour to run and its unit cost are fractions of the comparable costs of the actual air- "SHANGRI-LA" AIRFIELD craft being simulated. Aircraft can be put to their operational purpose instead of being withdrawn for training flying. All typical airfield and terrain features arc included Mistakes can be made in the simulator, and the correct pro- such as the control tower, terminal buildings, radio naviga- cedure practised until the pilot is 100 per cent proficient, tion aid sites, roads and trees. It is interesting to note in without endangering human lives and risking the loss of a this context that Redifon do not advocate the use of a model very expensive aircraft. identical to an existing airfield, and the systems for B.O.A.C. The use of a visual simulation technique whereby the and N.A.S.A. use models of a purely imaginary but never- pilot—instead of being trained entirely according to instru- theless entirely representative airfield—"Shangri-La." ment techniques—was able to look out of the front wind- There are a number of reasons for this but the basic screen of the simulator and see a projected view of the air- one is that all airfields throughout the world are continually field and its surrounding countryside, was a major step for- changing their form as runways are extended, lighting sys- ward in the march toward the ultimate goal of complete tems are revised and new buildings are erected. It would realism. be almost impossible to keep the model up to date and if the pilots using the simulator for training purposes were seeing the actual airfield regularly during normal flying and ^ Redifon Ltd., Flight Simulator Division, Gatwick Road, therefore aware of its latest form, then the fact that they Crawley, Sussex. were able to see during simulator training that the projected Radio, Television & Hobbles, June, 1964 THE MODEL

M64 PATON MULTIMETER The Raton Model 64 Multi-Range AC-DC Meter is a high-class instrument of an advanced design. The Unit has been specifically developed to suit all fields— laboratory, service or workshop. If represents THE LAST WORD IN RELIABILITY

Model M64 includes a number of modern improvements, some of which are listed hereunder:— TAUT BAND SUSPENSION The Meter Movement incorporates the latest Taut Band Tv.wn", Suspension system. Taut Band Suspension of the Meter l^H Movement is a comparatively new development. It elimi- VH nates the need for pivots, jewels, bearings and springs, thus IH obviating any possibility of "Stiction." • Vm OVERLOAD RELAY CUT-OUT 'h l^H The Paton Overload Relay Cut-Out combines extreme sensitivity with ruggedness to give full protection of meter, rectifiers, resistors and shunts, etc. SEMI-HARD RUBBER HOUSING The Housing of Model M64 is a moulded rubber substance, giSaRSlrSBaS^^^^^M which is both unbreakable and resilient to some degree. single knob operation This Unit utilises the Paton 24-Point Multi-Bank Switch (Patent No. 158906), which makes for rapid, foolproof range

^Volts ^D.C.: 0/0.1, 3, 10, 30, 100, 300, 1,000. Volts A.C.: 0/3, 10, 30, 100, 300, 1,000. Current D.C.; 0/1 (100 mV), 10; 100 mA—1, 10 Amp. Current A.C.: 0/1, 10; 100 mA—1, 10 Amp. Ohms: 0/5,000, 0/50,000, 0/500,000 Ohms; 0/5 Megohms. Decibels: -10/+3. +10/+23. +30/+43(0dB= 6 mW in 600 Ohms.)

ACCURACY: ±1.5% F.S.D.,.u.,D lm..,DCD.C.: - -2±2.5%-^.b/o 5% FSDc.b.u.,F.S.D., A.uACA.C -10/+3,600 Ohms.) +10/+23, +30/+43(0dB= 1 mW in price: 35 guineas SPECIFICATIONS Size: 9" x 8" x SVz". Weight: 8 lb. PATON MODEL M-32A THIRTY-TWO-RANGE MULTIMETER Model M32—1,000 Ohmj/V £14 17 6 Model MX32—20,000 Ohms/V £19 7 6 Model MX132—40,000 Ohm«/V £22 15 0 Ranges: Volts, D.C. 0/0.1-3-10-30-100-300-1,000 7 Volts, A.C. 0/3-10-30-100-300-1,000 6 Current, D.C. 0/1-3-10-30-100-300 mA,-l-3-10 omp 9 Current, A.C. 0/1 mA, (for use with ext. current tronsformers) 1 Ohms: 0/10,000 Ohms; 0/1, 0/10 Megohms 3 Decibels Kef. level I mW. in 600 ohms 3 Decibels Ref. level 6 mW. in 600 ohms 3

Other features: Meter scale, 4 in. oil measurements from two termino/s iK only, bakelite housing, test leads supplied. Accurate, reliable. ▼ Current Tronsformers ovollabfe to extend A.C. Current Ranges. NOTE; All the above prices are plus 121/2% Sales Tax. TERMS: Liberal extended payments, WRITE FOR DETAILS NOTE: PATON INSTRUMENTS are backed by "ON- THE-SPOT" FACTORY SERVICE.

PATON ELECTRICAL PTY. LTD. Established over 25 years Specialists in Electrical Meters and Rotary Switches 90-94 Victoria Street, ASHFIELD, SYDNEY i Tel.: 71-0381 (6 lines) Telegrams: "Palec" Agents in all States 10 Radio, Television & Hobbies, June, 1964 Flight Simulation — cont. airfield was not identical would to some extent destroy the illusion of realism. As the pilot "flies" the simulator, the television camera is automatically controlled so that the correct aspect of the scene is viewed and the resultant picture is either projected on to a screen in front of the pilots by means of a colour television projector or shown to them on a 21 in direct vision colour TV tube mounted in the flight deck windows. An E.M.I, vidicon colour camera channel is utilised for scanning the length and breadth of the model—the camera being mounted on a specially designed gantry sp that motion in the x and v senses is simulated by movement of the gantry along its rails and by vertical displacement of the camera on its counter-weighted platform. The aircraft heading, roll and pitch changes are reproduced in the special high resolution, servo controlled lens system attached to the colour television camera. Aircraft height is simulated by the camera moving toward or away from the model. The scene viewed is then relayed by a 405 line closed circuit television link to the three colour tubes which comprise the colour projector. The projection system is by Rank Cintel. WELDING HAIR-SIZED WIRES The result is an entirely natural and convincing impression of a take-off and By Donald Brannon landing, and when the system is used in conjunction with a simulator fitted Boeing has developed a device which can weld wires half the thickness of (with fuselage motion, the degree of a human hair to surfaces only a few thousandths of an inch thick. The new realism is further enhanced by the machine, designed by the electronic research group of the Aero-Space Divi- accelation cues produced by the co-or- sion's materials and processes staff in Seattle, solves several problems which dinated movement of the fuselage. emerged with the growth of micro-miniaturised electronics. Space vehicles, missiles, etc., require vast amounts of electronic gear. TRIAL "FLIGHT" Engineers and manufacturers have shrunk to pencil-point size such articles as Your correspondent recently had the transistors, diodes and resistors. Some entire circuits are composed of metallic opportunity to "fly" a research simula- films measured in hundred-thousandths of an inch thickness. tor with the colour system fitted at A typical problem in manufacturing these tiny parts is to connect a Redifon's Crawley plant, (although with- dozen or so hair-sized wires to a complete electrical circuit smaller than a out dynamic motion platform) and found penny. How do you solder or weld a wire without ruining it or without melting the degree of realism quite startling. It another wire which is only thousandths of an inch away? is no exaggeration to say that on a Until now microminiaturise electronic welding has been accomplished with simulated approach from two miles out great difficulty. Pressure of electrodes on pieces to be welded was erratic. all suggestion of being comfortably en- Electrodes suffered deficiencies of composition and electrical transference, and sconced in a ground simulator was lost lacked flexibility to accomplish varying jobs. Members of the electronic research and we were solely concerned with land- group spent nearly a year perfecting their new machine. ing an airliner on the end of a fast Part of the machine's success is due to its use of a precise weld pulse. approaching runway. This complete ac- This is the amount and duration of electric energy delivered to the weld point, ceptance of feel, response and visual coupled with the electrode pressure directed to the weld. The new machine presentation of the simulator was, we controls duration accurately from 1/1000 to 1/16 of a second. Electrode pres- feel, in no small way due to the depth sure can be varied from less than an ounce to 24 pounds. of confidence inspired by the colour Ease of controlling the machine reduces the need for highly skilled weld- rendering. ing technicians and cuts joining time by 80 per cent. To date the electronics To add the final touch, as we rounded research group has welded or soldered components with wires and ribbons as out and "felt" for the runway fast dis- small as 1/2000 of an inch thick. Heat control is accurate enough to join appearing below us came the blessed metal parts of solar cells, which are composed mainly of glass-like silicon. sound of tyres squealing on concrete By doing away with flux requirements for certain soldering operations, the to indicate that we were "down." If the machine takes a long step toward eliminating soldered-joint contamination amount of perspiration produced caused by the flux. Currently the welding device is fabricating components used was any indication of the system's real- in Boeing research and development, manufacturing experimentation and pro- ism then we would say without hesita- duct research. justified81 ^ claims were fully Apart from normal conditions, light- system unique and the 360 deg. circling valuable aid in training strike pilots and ing and visibility effects of the Redifon capability, which can be provided as keeping them at a high state of opera- colour system may be infinitely varied required, results in a training device tional readiness. from day to night, clear visibility to fog which can save a great deal of expense In support of the argument for using a and maximum to minimum cloud base, and possibly risk in flight-training. colour terrain-flying simulator rather Under night conditions, the runway Finally, it is worth mentioning tnat in than a monochrome type of presenta- lights and approach lighting bars are addition to the use of such a colour tion, it can be stated that tests have shown in their appropriate colours and system for landing and take-off simu- shown conclusively that pilots "flying" the full simulation of the red/white lation, a similar system may be utilised a colour simulator will maintain a much Visual Approach Slope Indicators perfor high-speed, low-level terrain flying lower altitude than when "flying" a mits unrestricted practice in the use of simulation. This type of flying is of similar simulator with monochrome pre- this internationally-adopted landing aid. course peculiar to military strike air- sentation. and thus be able to achieve These facilities together with the abil- craft and demands a high degree of a training state more closely approxi- ity to take-off from or land on both pilot skill and much practice, so that a mating to operational low-level flight, ends of the runway make the Redifon colour simulator can be an extremely (From "Aircraft Engineer") Radio, Television & Hobbies, June, 1964 II One of the latest forms of telegraphy is the Data-Phone. It enables tele- ■ phone subscribers to transmit a wide range of telegraph type signals over normal telephone circuits. It can handle teletype, facsimile, business machines and, as shown, medical data.

the slotted combs, of which there are also five. ^5 However, whether SB strikes SP or not depends on the position of the "U" shaped portion BG. This moves up and down in accordance with the "mark," or" "space" impulses applied to OR; up for a "mark," down for a "space." In the up position the blade SB will strike the pin SP, in the down position it will not. At the same time the third groove moves the lever TL and the shaft L which carries the pin SP. The shape of the groove is such that the pin is moved past the selecting fingers F so that each one may be engaged in turn —and synchronously with the impulses generated at the transmitting end. Thus, each selecting finger is pushed under its appropriate comb extension for each marking impulse. When the five elements of the character has been transmitted the fingers are lifted. The comb ______extensions having fingers under them are ■■ m I I M ff raised and the respective combs revolve I U || I 111 Iff slightly. There are 60 odd latches ■■ I mffl I _ mw ff t tL|W nera W around the comb assembly. The combs I g I % V4 III " are slotted in a special way and when «■ II III they are turned as described one group of five slots becomes aligned. There are over 60 possible combinations of slot

TnlnnKintAKOIJIIJIIIl 11 I I U| V fftjj5 XnrQQI Iv F ^ "'''oirarignmentoftheslotsforarar-ticular character, the appropriate latch ■ O lOU I IIILLlI AW Uwm I■ 11B M-fflll combs.will fall Theinto type the Wheel slots TR and is drivenlock theby a clutch. When a latch falls into position The Teleprinter is undoubtedly one of the most ingenious machines ever it catches on to an arm on the type 0cks he y C developed,i i r by i telegraphi i engineers.i • i i It represents, ml -i the successfulu x • break-j the required type' barhl atJ futhe ^top. The through from hand to machine telegraphy with its resultant easier and hammer HH is now driven forward speedier handling and, even more important, the completely automatic and forces the type bar against the nb- handling and routing of telegrams by such systems as TRESS. bon RG. This makes an impression on the paper tape or sheet. LAST month's article described how plained by means of the accompanying So much, then, for how the teleprinter telegraph signals are generated and diagram. In the diagram, RA is connect- works. Now let us take a look at how transmitted and how these signals are ed to the armature of the polar relay it fits into the modern telegraph system, received by a machine which punches and the lever CR is moved from side to Up to the 14th August, 1959, the holes in a paper tape, and referred to side according to the marking or spacinn Australian public telegraph service con- as a reperforation machine. This month currents applied to the armature. The sisted of point to point circuits radi«t- we will describe how this machine is direction of movement is marked on the jng from Chief Telegraph Offices used, in conjunction with the Teleprint- diagram S and M. (C.T.O.) in the capital cities to each of er. for the transmission of telegraph On the receipt of a space impulse rep- the larger telegraph offices throughout messages through the Tress system now resenting a "start" signal," a clutch mech- the country. Each office, generally in operation in Australia. But, first of anism is operated which connects the speaking, was connected ( all, something about the Teleprinter. cylinder RCS to the drive shaft MS, C.T.O. of its home State. Interstate otated traffic was carried In page printing machines such as the |;by a co continuously Teleprinter, when used as transmitters, , nstant speed By Calvin Walters ^"pSTci0,! transmission is again carried out by "l0'01": 1',e rTiecha; means of a keyboard, code bars and n'5"1 's so..a"an8e.d . , cuits which inter- cams similar to those in the perforator that the cylinder will make one complete connected the various C.T.O.s. Offices machines. However, instead of the code rew'ut.on by the time the mark impulse with no direct telegraph circuit to C.T.O. bars actuating perforating punches they . Five grooves in handled their telegraph business by tele- calise^rtongu^'oT'rtransmiuing3 lever ,his cylinder perform various functions phone, either to the nearest large of- to move to one side or the other accord- as 11 rolates- fice or, in metropolitan areas, with the ing to whether the position is to be The first groove operates the bell C.T.O. marking or spacing. This side to side crank lever FSL. The groove has five Generally, communication was by movement operates a marking contact indentations, which deflect FSL five means of Morse Code apparatus, with on one side and a spacing contact on times in each revolution. The deflection the exception of interstate circuits and the other. Thus positive spacing and is transferred to the blade SB and be- the circuits to the larger post offices, negative marking voltage is fed to the comes an enlarged horizontal move- which were equipped with teleprinters. line in the proper sequence of the code ment at the end near the finger setting Intrastate "through" telegrams required together with start and stop impulses. pin SP. In the appropriate circumstances four telegraph operations before de- When these impulses are received at this movement will drive SP forward livery. Interstate telegrams required six the distant receiver on a page printing against one of the selecting fingers mark- telegraph operations. The average num- teleprinter machine the following ed I, 2, 3. 4, 5, and move it under the ber of handlings before delivery was sequence of events takes place, best ex- horizontal extension HHL of one of four. Thus the main problem with the 12 Radio, Television & Hobbies, June, 1964 great volume of traffic handled at Part of the TRESS C.T.O.'s was the internal handling of installation at the messages. Sydney terminal, It had not been found possible to showing a tow of transfer a message from one line to an- teperfor ator other in a C.T.O. with less than three machines. These handlings by circulation personnel at machines store in- primary and secondary sorting points. coming messages This added considerably to both the cost on punched tape of handling and the overall transmission in readiness for time of telegrams. Thus the cost of t e t r a n smission operators added considerably to the cost when a channel of handling telegrams. In fact it is more becomes available. than half the total cost of a telegram. It was realised that if manual retrans- mission of telegrams at C.T.O.s could be eliminated by automatic switching, the cost of operation would be reduced considerably. BIRTH OF TRESS Thus it was that TRESS was designed. The word TRESS is derived from , the first letters of Tape Reperforator "start" signal is encountered at which one in turn before returning to the test Electrical Switching System. Briefly, it 1point the transmitter stops and calls for position again. is a storage type system, as distinct from 1a register. This unit starts the trans- When the circuit is found to be free direct switching systems normally used 1mitter, reads and stores the routing the sequential start allows the next serial for telephone switching. There is no 'symbols transmitted from the tape, then number from the auto numbering equip- direct interconnection of lines, but each !stops the transmitter. One register serves ment to be transmitted. After transmis- message is sent into a store (punched .10 transmitters and its function is to sion of this serial number the sequential tape) at the switching centre and sub- 1interpret the routing symbol of the office start allows the rest of the tape to be seqently re-transmitted automatically to *of destination and pass this information passed through the transmitter. Before on to the "marker." completion of the transmission the a selected line when it is free. ' The Marker, having had the office of Number Bulletin Printer automatically TRESS exchanges are situated at each destination "told" to it by the register, records the routing symbol, the next of the mainland capital cities. Trunk :immediately searches for a free outlet, serial number on the outgoing circuit lines are used for long distance signalling, |by means of a selector switch which, followed by the routing symbol and using Multi Channel Voice Frequency .having found a free outlet, "marks" it serial number of the message from the circuits. Either Simplex or Duplex Cir- .and frees the Marker and Register to originating outstation. cuits are used between certain stations |serve other transmitters. and the C.T.O. in each State, depending ' CLEARING SIGNAL on the distance between them. The sequential start now comes into operation and when the outlet is free it On completion of the transmission of The principal item of equipment used Iallows the message to proceed. If a the telegram, the switched connection in the TRESS System consists of a trans- message' from another transmitter is in between the reperforator-transmitter milling unit at the originating office. This course of transmission' the sequential and the outgoing circuit is severed auto- is usually a teleprinter. In some cases start, will not allow any transmission matically when the "clearing" signal is two teleprinters are in use, one for trans- juntil the outlet is free. Several trans- transmitted. During transmission the milling and one for receiving. At the lmitters may "camp" on the one outlet signal impulses are transmitted to the exchange at the C.T.O. there is a tape in■ this way but they will not be allowed office of destination where they operate reperforator transmitter described earlier, jto transmit until the line is free. They the teleprinter which types out the a Register, a Marker, a Uni-selector, a ,will then be allowed, by the sequential message on the telegram form. This has Sequential Start Circuit, an Automatic ,start apparatus, to transmit in their all been done without the intervention Numbering Unit and a Number Bulletin |sequence and as the sequential start will of any personnel between the originating Printer. ;serve 10 transmitters it will service each office and the office of destination except Each teleprinter office throughout the Commonwealth has a code number consisting of two symbols. For instance Sydney is SR, Melbourne MR, Adelaide AR, Brisbane BR, Perth PR, Parramatta PA, Tumut TT and so on. SENDING PROCEDURE Suppose now one office wishes to send a telegram. The operator will first send a "beginning of message" signal, followed by the code symbols for the two letter routing symbol of the teleprinter office to which the telegram is being sent. Then follows the two letter routing symbol of the teleprinter office of origin followed by the message serial number. The next details to be transmitted are the preamble, address, text, signature. Then follows the "digit time" representing the time of transmission. For example a telegram lodged at 10.5 a.m. and transmitted at 10.36 a.m. would show digit time as "36" (if transmission were delayed beyond 11.5 a.m. the actual time would be shown), then follows a clearing signal, clearing the line for the next message. At the receiving C.T.O. the message is received on a reperforator transmitter which begins punching the message into 1 the tape. As soon as 18 characters have Exploded view of teleprinter receiving mechanism. This should be studied in been perforated the tape commences to conjunction with the text, which explains how the five unit code is translated step through the transmitter until" the into plain English. Radio, Television & Hobbies, June, 1964 provide management with a "voice" to KBOHENTWMEHHUULCOME, OHE UAPRUSNSAPJ, TO TALK OFHMUNYSTHII1GSA enable business machines to communicate with each other in much the same OF SHIPSFANJ FEUFNAVD SAALING-UJX, OF CAT-ZS' -( way as people do over telephone lines. By the use of the machines, Punched A11D WPY THE KEWtllU VADENOFPINN ANJSQYETHAV PIGS VAELWCNS. Card, paper and magnetic tape, facsimile, "live" handwriting and medical telemet- MURX MAGYIQQITE CONTRACY, HOWNBOHU YOURNG YG ric data can be sent to distant destina- tions. SGCOUt P In typical systems, Data-Phone units are connected directly to business RYCRYCYRYRXRCXRYRYJYRYRYRYCXRYCQGYCQRYRYRQCXGYRYRYXJXCCY machines both at the sending and receiving locations. Information is trans- CQIRyiVYIKYQRaiRYCRftlRQIRYIRYCRYIJYCCYIGYXRYIJYIRFUCYWRYIRYI mitted with the push of a button after a regular telephone call is placed to the receiving station. The Data-Phone Units Particularly where radio links are inyolyed, messages often become garbled accept data in the form of electrical im- due to poor circuits. The one shown above is a typical example. Many pulses or "bits" from originating systems have been developed to correct such errors, a recent one being the machines and convert them to tones Marconi "Autospec." Below is the same message as corrected by "Autospec." suitable for telephonic transmission. Receivers THE4TIME HAS COME, THE WALRUS SAID, TO TALK OF MANY THINGS- The receiving set converts the tone back to electrical pulses, to operate tele- OF SHIPS AND SEAS AND SEALING-WAX, OF CABBAGES AND KINGS, printers or other business machines, producing the exact duplication of trans- tm WHY THE S-W IS HAKE OF INK, AND WHETHER PIGS HAVE WING-K mitted material. This material can be any of those mentioned above including MARY MARY QUITE CONTRARY, HOW DOES YOUR GARDEN GROWY direct transmission of, for instance, heart information direct from a patient's chest HYRYRYRYRYRYRYRYRYRYRYRYRYRYYRYRYRYRYRYR through an electro-cardiograph via the Data-Phone Set and on to a specialist's RYIRYIRYIRYIRYIRYIRYIRYIRYIRYIRYIRY office hundreds or thousands of miles away. The advantages of such a system are obvious. the technicians who look after the equip- operation can handle 400,000 words per;r Another development worthy of men- ment. second to and from about 70 countries;s tion is error correction. Despite all pre- Practically all of the switching equip- via radio and cable links. It will auto- cautions errors sometimes creep into the ment consists of capacitor relay devices matically transmit and receive messages■? transmissions of telegraph information. together with electric motors for the and identify in a fraction of a second This may be due to the human element selector switches. Over 700 post offices any one of 7,000 cities, States and coun- or to such oncontrollable things as the throughout Australia will be eventually tries. weather, static interference, fading and equpped to transmit messages via TRESS. The system will "handle messages inJ? so on. The latter is of importance where Thus will be seen the passing of the three languages and any one of 12,000u high frequency radio circuits are used. Morse Code which was first introduced internationally coded addresses. It cann Some years ago the Marconi Company into this country in 1854. handle any mixture of HE radio, cables,I' of England introduced their "Autoplex" And what of the future ? satellite or wire channels." ("Electronics:s automatic error detection and correction In this modern age of discovery it is Weekly"). Messages are transmitted byy system for telegraph transmission over unthinkable that we have reached the precedence in chronological order after:r high frequency circuits. This uses a 7- ultimate in telegraph signalling methods. being received and stored in its memoryy unit code which enables errors to be Somewhere along the path we must drum. detected and corrected by requesting re- surely meet with a computer, used in Messages are received in five unitit transmission. The system is mainly used some way, to further the cause of the codes and enter the computer on per-r- in multi-channel circuits on which traffic telegraph system. Surely enough, a re- forated tape. The 'message has all thee is passed in both directions simultan- port in the English "Electronics Weekly" usual coded instructions as previouslyy eously. of February 19, 1964, describes such a described, but with the addition of a device. priority code. The system automaticallyy "AUTOSPEC" Described as the "Fastest, most accu- selects, in chronological order, the high-i. For simple circuits which do not use rate telegraph system," it has been de- est priority message in its memory,^ multi-channel operation, the Marconi Co. veloped by RCA Communications Inc. searches for a free line and transmits it.t. has recently developed their "Autospec" and has been recently demonstrated prior Monitor copies are recorded on magneticic system. (Automatic Single Path Error to its coming into use in a few months' tape which can be examined for account-t. Correction.) This is a small, ferri-transis- time. ing information. torised piece of equipment to add to This system uses two high speed Another device recently developed isjs H.F. telegraph links. Requiring no trans- digital computers, one in operation and the "Data-Phone Service," devised by the mitter at the receiving end, it operates the other on stand by. The computer in Bell Telephone System, of U.S.A.. to with teleprinters and tape transmitters. It automatically detects errors due to fading, noise, etc., and prints a special character if an error is detected but not corrected. Details of these two systems are not to hand. Of course, mention must be made of the famed co-axial cable which has enabled a vast number of extra channels to become available for both telephone and telegraph communication. This cable between Sydney and Melbourne is one Another typical' of the most important steps forward in application for thes Australian communication. However, no Data-Phone. The9 doubt, even as I write, clever brains Data-Phone 'unit* somewhere are at work making obsolete (foreground) iss those things which have only recently connected to thes become new. punched cardi The writer is indebted to the Public machine behind it.. Relations Office of the P.M.G. Depart- The operatorr ment and to various technical depart- simply dials thet ments for invaluable assistance in pro- connection in thei viding technical details which enabled usual way. this article to be compiled. Radio, Television i Hobbies, June, 1964 Australian audio enthusiasts

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It's not hard to fathom . . . because we give the enthusiast better value (and prompt attention) we enjoy the biggest turnover of audio equipment in Australia today. Here is equipment from the world's greatest manufacturers—write to us for a quotation on any item you require. Our query service will reply speedily. The benefits of bulk purchasing will aid your budget considerably! All Encei equipment is BRAND NEW . . . the SALES-TAX people have had their share . . . you will not be involved in HIDDEN EXTRAS. It is quite impossible for you to buy better anywhere else in Aus- tralia. That's why people prefer to deal with Encei Electronics! Now examine our Special Offers for June.

11 Ste e0 ai Wllh f 1 Medding Four-Four P100 stereo ampli- 1 2 el?# "' ^ » »5 * !Ia* = J H ,urntab, and A11 =1 fiers. Range: 20 c/s to 30 kc/s plus f nainn?^ nirkfm' I 3 e 5 ArbUj| mimic iJ/ld/ iHK i£ iJaJance,w opickup Wharfcdalc with ADCor Richard stereo Allendiantond Sin SI m »»Bi,lance | ^_ ,onc "..rmm 5 1 OUR PRifF 5 Fs- speak"!, £107. With lOin F.S. speakers I ^ . J/i . = £120. If you use a Labcraft J73 turntable | AAA / A / £27/ 1 0/B = and diamond stylus. £89/10/- | £28/8/- ! siHnMiiHiiiiHiiiiiiinHiiiMiiiiiHiiMiiiiiiHiiMiiiMiiiiiiiiiiiiHiiiiiiiiiiMtitiiiiitiiiiMiiMiiMiiiiiHiiiiiuiiintiiMiiiiiiiiiMiiiiiiiuiiiiiitiniiiiiiMiiiiiitiiiiiiniuiiiiiiiiiiiiiiiiiiiiniiiiiuiiitiiitiminiiimiiiiiiiiiiiiiinuniiiiiiiiiiuiiiiiHiiiHMiiiiutiiiitiMiMiiitiniiin I 15 Medding0 tunersIJpP with verbler dial, built- | , pione(.r SM0 300 amplifi<:r aM/AM 21 4. PioneerTandberg tuner/amplifier 4 track stereo com- tape recorder, ^| .. *13/13/6Jl ^?*/l s1 OrtofonFM SMGSW tuners.212 toneOrpheus arm Silexand turntable.Ortofon | blnation. two 12in co-axial ^4^91 | A4 A / 4 A / - SPU-GT-E cartridge, two lOin A4CA 5 PioneerPinncer speakerssneakers ; v I J* / I M / — £1 Wharfedale fnamfoam surround ♦ I £13/19/- 5 speakers £159 | ^ Medding P57 Eight-Eight stereo ampli- | Q Orpheus Silcx or Connoisseur Craftsman Polished FLER speaker columns, with | I ' • fiers in timber cabinets, Laficraft turn | transcription turntable. All Balance tone Rola 12 PX Speakers. i 3 table with diamond stylus. AEA / 4 A / i arm. Decca Deram or the new Gold- (*4 A = two Wharfedale or Rich- T-AH / I H / ■ i ring CS 90 ceramic cartridge. VAJ 1 (Also available 8145 I ard Allen 81n speakers.. WwlF/ | price *0 ww 1 without speakers £10)

1 lA Medding Mullard 10 watts per channel 1 § _ _ t-, cr, . , ^ . n. U. | | 10. s,ereo amplifiers, separate magnetic | .. special! Medding 10 watts per channel 1 12. mahogany "and" map" ^ ' I 3 Knsitivityon comrol1 unit.h J.H. lurntable. J H | II. p63 yerco amplifier, separate P 80 3 Award Tinn?". modern desiaii 3 19 lOin^tnin •',JWharfedaleVl/V. o r(~A.' oV" 1 a wide"J< rangeranoj.ADC speakers«n^akr>rccartridge, fvnK-(Subtwo 3| .ma8n . . e,ic sens,„. pre-aimpliflers. U valves.s 3* Award winning modern des.gn |— stltute the Labcraft 605 turntable A 4 AO | List price £91/10/. and All Balance Arm If you T_ I Iflfl 1 Never to be repeated at .. .. £55 prefer) ^ § (P65 power amp. only £35) £11/10/- =SlItWIIIIIItttlllllllllllllllllltlllllllllllllliliHItllllinillillllllllllMIIJIIIIItlllllllllllllllli.nilHIIIIIttltlllllllllllllllillHIIIItlllllNlllltllllllllfllltllllllilllllililllllllllllllllllllttllll b s ^millllUllllltHUItillllltllllHIltlltlllllllHIIIIIIIIIIIHIINIIIHIillllltttilMllilllllllllllflls , s 1 T A DC DD^/^DACDC -*131 Medding Mullard stereo amplifier with | Imported stereo amplifier with five I E 1 Mr C fXCwv/rVMCrVJ I matching control unit, Labcraft turn- i valve control unit, PP EL 34s in each 5 S a. . m i. . w# i table with stereo diamond, two lOin Wharfe- i channel, twin power supplies.lies, 25 watts output 1 2 Akaif Philips, Qrundig, etc. Write 5 dale or Richard Allen A AC / 4 A / i§ RMS in each channel. AO / 2 = Rush these at this I for the Excel pricef 1 {ft™ fclO/IU/" 1 price ^ £59/10/-fcOlf/ I U/" | HIIIHIIHIIllHHIIIIMmillilfllllHIIIIIIIIUI I

When you're writing please don't forget to give us your full address. We will care-pack and freight anywhere. There's no distance barrier at Encei Electronics. And if the items you require are not listed . . . just invest fivepence in a stamp . , . drop us a line . . . you'll be delighted with the Encei price!

354 BRIDGE ROAD. RICHMOND, VIC.

Tel. 42-2820. Factory 47 Coppln St.

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Encei Electronics. . . Australia's Greatest Hi-Fi Centre

Radio, Teleyltion A Hobbiet, Juno, 1964 IB latestES Hi-Flux 4'

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Two new informative leaflets have Here at last is a low-cost tweeter with the just been released by MSP. Be sure to obtain your copies from performance of expensive, elaborate designs. any of the leading radio parts distributors throughout Australia. The specification below speaks for itself. Frequency Range: 2-15 kc/s Power Handling: 5 watts Total Flux: 14,500 lines Flux Density: 8,000 gauss V.C.: 15 ohms (at 3 kc/s) V.C. Diameter: 9/16 inch Mounting holes: 4 11/16" P.C.D. Baffle opening: 3%" Dia. This is what R. T. & H. (Oct. '63) said after testing this MSP 4" tweeter. "It has high sensitivity and is much cheaper than the imported tweeters. Its special curvilinear cone gives good response to 10 kc/s, tapering gradually above this. It represents outstanding value." This is one of the latest additions to the comprehensive MSP range of high-quality sound reproducers. fM 1 MANUFACTURERS SPECIAL PRODUCTS PTY. LTD. 47 York Amalgamated Wireless (Australasia) Limited.Street, BRISBANE; Sydney. Chandlers 2 Pty.0233 Ltd. ADELAIDE; Newton McLaren Ltd TH: Atkins (W.A.) Ltd, Carlyle & Co, (1959) Pty. Ltd, HOBART & LAUNCESTON; Amalgamated Wireless (Australasia) Limited. 16 Radio, Television t Hobbies, June, 1964 technical

(Revi

PATTERN RECOGNISER PROBES DOLPHIN SPEECH and semirigid short rods fastened at one Man and Dolphin Joined forces recently in a project to learn something end, tend to vibrate at a given resonant of the manner in which dolphins "talk" to each other. Quito apart frequency. The fibres in a Sceptron are from the immediate reasons for this line of research—or its outcome of different lengths, so that they will —it has resulted in the development of a most ingenious speech pattern resonate at different frequencies from about 100 to 20,000 cycles (in present recogniser which could have far reaching effects in many other fields. equipment). The Sceptron under discussion contains 700 fibres on a base i By FRED SHUNAMAN inch by i inch. Much smaller units have been built. rpHEpHE man in this experiment was Rob- words at a time, as patterns, and faster The Sceptron patterns are recorded 1 ert Hawkins of the Sperrv Gyro- readers recognise patterns composed of (or recognised) on a photographic plate scope Co.. and the dolphin was "Lucky," whole groups of words, without consid- or mask placed ahead of the free ends from the Philadelphia Aquarama. Haw- ering their sounds. of the fibres. A mask is the stored kins is recording an example of dolphin Sceptron is a device entirely new in image of a signal or signal pattern. "speech using This special invention of the communications field. It combines his own. How it works is explained in the techniques of electronics, optics and The basic type is the so-called static this article. acoustics. Its basic elements are a mask. It is made by exposing the photo- Why communicate with dolphins? bunduTof tiny optical TbreT- quartz ^aphic Pjate when the tips are at rest Scientists believe we can learn much or glass rods that carry light without let- sensitive plaW d^ctly^rfront about communication, and even about S JS STlU IS SSk SJSK ourselves — by communicating with a species whose approach to language (and at cme end and are free to vibrate at the base so their ends are a" equally perhaps even to thought) may be vastly other. A light source to send light 0 * different from our own. through them, a loudspeaker driver or J many deferent lengths. The plate is ceramic element to put them into vib- developed as a negative, THEY DO TALK ration, a photographic plate or "mask" Thus, when the mask is replaced, We have learnt definitely that dol- and a photocell complete the equipment, there is a black dot in front of each phins communicate with one another by The fibres, besides, being optical de- fibre and no light can be transmitted. If using sounds, as we do. And dolphins vices that will carry light, are mechani- the fibres are put into vibration by ap- are possibly the most intelligent of non- cal devices which, like all other rigid plying a signal to the driver unit. human species. The dolphin brain, in its size and the complexity of its convolu- tions, is practically on a par with that of man. STATIC MASK Several groups are studying dolphin ☆ language, including the United States Navy, the Oceanographic Institute at ////A Woods Hole, Mass., the Communications Research Institute (Miami, Fla.), and Figure 3. Three such practical commercial concerns as mm Lockheed and Sperry. Sperry, however, types of mask has introduced one new feature — the produced by Scep- equipment known as Sceptron* (Spectral tron. The static ComparativE PaTtern RecOgNiser). This mask (top) is a may well revolutionise methods of study photographic neg- REJECTION MASK in which it is necessary to discover or ative representing identify events or groups of events. In- the points of light at the end of the '////A stead of recording the sounds on record W/H/tmi m I ^ or tape, for future interpretation and fibres, with all mm® evaluation, the whole pattern of Lucky's fibres stationary. "words" is recorded and evaluated in- The rejection stantly with Sceptron. mask is a nega- -i The recognition of patterns is one of tive of the light our most important mental activities. pattern produced 'VV When we pick a friend out of a crowd, from a particular i-!. we simply recognise a pattern — his sound, while the ACCEPTANCE MASK •*-- features. Our daily work consists of re- acceptance mask cognising. evaluating and changing pat- is a positive of - - c: - *3 terns. Even reading this article is a pat- such a pattern tern-recognition project. The words in superimposed ion which it is written may well be a sequen- the static mask. tial series of individual letters, or com- The two lower binations of letters, that make up sound masks represent signals. In practice, we read whole the word "five." Radio, Television & Hobbies, June, 1964 17 Department of External Affairs

RADIO TECHNICIANS

and

OPERATORS WANTED

POSITION: SUPERVISING TECHNICIAN

Salary per annum: £1,721. Location: Mawson (1) and Wilkes (1). DUTIES: Install and maintain HF transmitters up to 5KW output, HF communication receivers, portable field equipment, ground aeradio communications and navigation equipment, radio teletype systems and fixed antenna systems and telephone lines and instruments. QUALIFICATIONS: Qualified Senior Radio Technican. Wide experience in the maintenance or installation and testing of radio communications transmitters and receivers and radio navigation equipment.

POSITION: POSITION; RADIO SUPERVISOR RADIO OFFICER

Salary per annum: £1,301 — £1,385. Salary per annum: £1,101 — £1,287. Location: Macquaric Island (1) and Davis (1). Location: Macquarie Island (2), Mawson (4), Davis (1) and Wilkes (4). DUTIES: Install and maintain radio transmitting DUTIES: Radio Telegraphist. and receiving equipment, and act as Senior Radio Telegraphist. QUALIFICATIONS; Commercial Operator's Certificate of Proficiency or equivalent service QUALIFICATIONS: Applicants should state any experience. Ability to send and receive Morse appropriate licence or technical diploma held Code at least 22 w.p.m., and to touch type at by them. A thorough knowledge of theoretical 35 w.p.m., together with experience in the and practical electronics plus a First Class operation of ground radio installations utilising Commercial Operator's Certificate of Pro- Morse, teletype and speech communications ficiency or equivalent service experience. facilities.

CONDITIONS OF EMPLOYMENT Two to four months preparatory work in Melbourne followed by approximately 12 months at the Station. Tentative sailing dates;—Macquarie Island—early December, 1964; Mawson, Davij and Wilkes—late December, 1964. Whilst absent from Australia, kitting and maintenance are provided free by the Commonwealth, and there is an allowance of 371 per cent of salary up to a maximum of £575 per annum, in addition to which a district allowance of £325 per annum for married men and £200 per annum for single men is paid. Recreation leave accrues at the rate of five weeks per annum. Subject to the provisions of the Income Tax Assessment Act, Zone Allowance deduction of £270 may be allowable. Salaries commence within the appropriate range according to qualifications and experience. Employment will be in a temporary capacity under the Public Service Act, 1922- 1964. Applicants must be in robust health. Ice or snow experience not required, but history of outdoor activities is desirable. Applications, which must be accompanied by a recent photograph and the names of at least three referees should be lodged with— The .Direcfor, Antarctic Division, Department of External Affairs, 568 St. Kilda Road, MELBOURNE S.C.3. VIC.

18 Radio, Television & Hobbies, June, 1964 light is transmitted to a photo-cell and or if they are repeated for reliability. sounds because they have to vocal a signal is received. When the sounds were played in a Scep- cords. Two other masks are made: Rejec- tron during a three-second light ex- Considering the number of activities tion and acceptance masks (Fig. 3). The posure, about 70 fibres out of the 350 that depnds on pattern recognition, a rejection mask is made by exposing the responded to the signal. The sounds wide range of applications seems pos- photographic plate while a signal is when replayed produced maximum out- sible. For example, the medical world being received. The plate is developed as put from the Sceptron. The recorded could use Sceptrons in cardiography. a negative, so that the whole area which calls of six other species produced from With a large number of units, each pro- received light is dark. Thus no signal is 18 per cent to 95 per cent less output grammed to recognise some particular passed when the fibres are at rest or when played into the memory-mask heart condition, the Sceptron could im- when the "Desired" signal pattern is re- made by the original signal. mediately point out the area in which ceived. Any light that passes the rejec- It has been suggested that the Scep- the doctor should look for the trouble. tion mask indicates a pattern other than the one desired. The acceptance mask is made by ex- A graph thawing H—MlIIHMMHHHIiHH posing the plate while the desired signal how the Sceptron, is being received, developing it as a positive and then superimposing the black programmed to dots of the static mask on it. When the accept the word fibres are at rest, they are directly ahead "five", respondt of the black dots and no light is trans- to spoken words iiiwrai mitted. As soon as the desired signal from "one" to ■■■ is received, they vibrate away from the black dots and transmit light through the mask. Thus the desired signal will produce the strongest output. tron could be used to help a human In some types of automatic weather- mimic the dolpin's speech. Unfortunate- reporting equipment, and some satellites, SUBTLE SHADES ly the dolphin's frequency range is very much of the broadcasting is repetitive. This is not entirely a black-and-white different from that of the human being: A rejection type mask could be used to proposition. Some fibres will vibrate so much so that it is normal to play trigger receiving equipment only when more than others, due to the total quan- back dolphin sound at one-quarter of the signals departed from normal. In tity of sound being received, and the the speed they were recorded at to make product testing — on a production line, mask will, like a photograph, be com- them understandable. The dolphin ap- for instance—the results of a large num- posed of a number of shades of grey, pears to have a similar difficulty in re- ber of tests could be registered simul- varying from almost black to almost peating human words. He has attempt- taneonusly. Possible applications suggest white, giving a more faithful image of ed to do so, but does not mimic closely, themselves in a sort of chain reaction, the input signal. according to the human hearing. How- each one pointing the way to two or Various attempts have been made in ever, we don't know how dolphins hear, three more. the past to analyse words. One method and they have difficulty with human (From "Radio-Electronics," April, 1964.) was to split the various sounds into frequency spectra with bandpass filters and observe the amount of sound in each frequency band. To simplify the problem, the word might be divided into 10 parts, so that a large number of "POD" MAY REPLACE CATHETERS measurements could be required for a given word. In another device, five The "Pod" is a new miniafure medical device fhat can be Inserted into measurements were taken, and a com- a vein or other passage in the human body, then propelled and guided puter 1 decided which one of a possible by externally applied magnetic fields to perform a variety of medical sixteen words had been received. tasks in places and organs that are normally inaccessible to doctors. The great advantage of the Sceptron is that it recognises all portions of a pattern simultaneously. It is able to SEVERAL experimental versions of the cific areas; collecting of tissue or fluid make a tremendous number of measure- Pod have been developed by Prof. E. samples from various organs; and minor ments simultaneously. For a very com- H. Frei and Dr H. N. Neufeld at Israe'Is local surgery such as cutting or widen- plex sound pattern (or possibly several Weizmann Institute of Science. The ing. Such procedures could take the sound patterns very close to each other) basic element is a small permanent dipole place of catheterisation, which is, at pre- more than one Sceptron might, be re- magnet, embedded in a chemically inert sent, time-consuming and difficult, some- quired for proper evaluation. In Fig. 4, unit about a millimeter in diameter and times even impossible, Frei said. the response of the Sceptron is shown four millimeters long. The material Experiments have been conducted at to the words "one" to "ten" when fitted absorbs x-rays for easy fluoroscopic mo- the Weizmann Institute introducing Pods with a mask to accept the word "five." nitoring. It can be propelled through into the circulatory system of living dogs; blood vessels at speeds up to 40 cm/a usually the Pod was attached to the end sec. ADDITIONAL DATA of a thin nylon thread. The researchers The simplest means of propulsion of have also demonstrated the device's ope- Remember that spoken words are not the Pod is by applying constant magnetic ration in models of human arteries both ideal signals to experiment with. Be- fields that have to be varied only in ac- with and against the direction of flow sides containing enough information cordance with the changing directions of a liquid simulating blood. about the word to identify it clearly, it of the unit during its progress through also contains at least ten other items of the body. Since the Pod is essentially a OTHER APPLICATIONS information about the speaker, the parti- constant magnetic dipole, magnetostatics Several other possible applications in- cular use of the word and the physical allow easy calculation of the translatory clude use as a flowmeter in a blood environment in which it was uttered. and rotatory forces. vessel, using a Pod with the same specific For example, most people recognise According to Dr Frei, switching of gravity as blood. whether a word was spoken by male or the necessary magnetic fields may be The Pods have been made in various female. In some circumstances, even accomplished through servo-mechanisms sizes and shapes, depending on intended the temperature in which it was uttered operated by the attending physician, or, application. Some are flexible and thin, is known. in complicated cases, by a preset pro- to allow passage through small vessels; Some of the words "spoken" by dol- gram on a computer. Progress of the others are pointed; still others consist of phins are clear and uniform. One type Pod can be monitored on a fluoroscope of four parts and are hollow, for deliver- of signal starts at 10,000 cycles, sweeps or by magnetometers; where the Pod is ing drugs. down to 5,000 and back to 10,000 again carrying radioactive material, nuclear Plans for future research include the in about 0.1 seconds. A pattern might detectors can be used for monitoring. investigation of Pods in heart pacemaker be repeated two to five times in rapid Among the functions the Pod can ful- applications, as telemetry pressure trans- sequence. It isn't known whether the fil in the body is the delivery of small ducers, and for intracranial applications. groups represent single dolphin words, amounts of concentrated drugs to spe- ("electronics" 10-1-64)

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RANGES DC Currcnl: 0-1. 10. 50. 250 Milliamperes. O-IQ ACCURACY Amperes. Note: For higher ranges use Plug-In Calibrated to well within BS89:I954 specifications. shunls available as accessories. AC Current: 0-1 Milliamperes (self-contained). RELIABILITY 0 0-2.5. 5. 25. 50; 250, 500 Milliamperes. 0-1, 2.5. Uses only high stability multipliers and shunts. 5, 10 Amperes. 0 Use Model MRCT Current Transformer available SENSITIVITY as an accessory. 5.000 ohms per volt. AC Volts) DC Volts/ 0-10. 50. 250. 1.000, BATTERIES Resistance: 0-1.000. 10.000. 100.000 Ohms.. 0-1 Uses 2 only standard 950 cells replaceable without Megohm (10 ohms centre scale). opening instrument. Output Level: minus 6 to plus 22 db. plus 8 to APPEARANCE plus 36db. plus 22 to plus 50 db, plus 34 to plus Pleasing two-tone grey. Sloping front panel. Meter 62 db. (ref. 1MW in 600 ohms equals 0 db.) protected by hood.

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106 BELMORE ROAD, RIVERWOOD, N.S.W. UNIVERSITY Tel.: 53-8758, 53-0644 (5 lines) Telegram: "Raquip," Sydney GRAHAM (A UNIT OF INSTROL) W.A.: Alklni (W.A.) Ltd., «94 S.A.: George Procter, 52 Cooler INSTRUMENTS Hoy Street, Perth, W.A. Place, Adelaide, S.A. TAS.; W. P. Martin and Com- PTY. LTD. QLO.; Keith Percy and Co. Pty. pany, 188 Cottins Street, Hobart, Ltd., Box 1478V, G.P.O., Bmbor.c', and 134 Cambridge Street, Laun- Qld. ceston. 16IFP.S8

Radio, Televiiion & Hobbies, June, 1964 s~

'•V* *4

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for such things as map reading in the dark. Two types of image Production Control converter tube and lens are available according to the need for a The saving of time, which can be vital in production con- wide angle of view such as potholing to inspect a room or a trol, is the purpose of a fast and flexible electronic system for cave, or close use for repairs to machines or map reading. recording and presenting data, as recently demonstrated in Brit- ain. Effect of the system is to give the production controller in complex operations (electric power generation, oil refining, steel 'Robbing PET A To Pay making, air traffic control, for example) a continuous visual indi- The British Home Office has just received a total of 24 cation of what is happening in parts of the plant remote from sets of PETA speed measuring equipment from Marconi's. central control. This will be used to augment the 112 PETA sets already in use The system, which has been named Alpha-Numeric Display, by police authorities throughout the country to provide an ac- is, in simple terms, a memory box associated with scanning cir- curate, safe measurement of traffic speeds in an effort to reduce cuits and one or more cathode ray tubes for displaying infor- the death roll due to speeding on busy roads. mation in the form most convenient for any type of control The Marconi PETA (Portable Electronic Traffic Analyser), operation. It can be the kind of information which the con- which was designed in collaboration with police authorities, works troller usually obtains via telephone calls, staff meetings or by on the same principle as an aircraft Doppler Navigator. The similar manual methods. (Associated Electrical Industries Ltd. basic accuracy of the equipment is better than 2 m.p.h. over the Australian agent: Australian Electrical Industries, 93-95 Clarence entire operating range. In addition, the equipment has been de- Street, Sydney.) signed to fail "safe"; any faults in the system will produce a low reading of speed rather than a high one. PETA is normally used by police forces as a deterrent rather Solar Powered Alarm than as a trap. In many cases large-size notices on country A radio alarm system powered by solar cells is believed to boundaries and on main roads advise motorists that radar checks be the first commercial application in Britain of a warning de- are in use and every effort is made to encourage the motorist vice making use of the sun's energy. It is designed to broadcast to reduce speed to within the legal limits rather than to punish warnings of danger situations such as power network failures him for exceeding them. or rising water levels. Use of solar power by converting day- light into electricity via silicon cells enables the equipment to be used in temote situations where normal power supplies are not TV By Telephone available. A British firm is experimenting with an improved system The equipment can also be used from a normal mains supply of transmitting television signals over telephone cables. Because where available. (British Telecommunications Research Ltd. and of their limited capacity these cables cannot carry the enormous British Central Electricity Research Laboratories. Australian amount of information that goes to make up an ordinary tele- agent: British Automatic Telephone and Electric Pty. Ltd., 325 vision picture, but the new system—called pulse code modula- Sussex Street, Sydney.) tion—enables enough of it to be transmitted to provide a reasonable picture. At present the picture is of 245 lines. But, by making the Magnetic Liquids screen smaller than that of a normal receiver, it becomes ac- Liquids which are attracted by magnets are now available ceptable for a television telephone. (British Telecommunications from Diamond Alkali Development Department, 300, Union Research Ltd. Australian agent: British Automatic Telephone Commerce Building, Cleveland 14, Ohio, U.S.A., for experi- and Electric Pty. Ltd., 325 Sussex Street, Sydney.) mental use. They are intended as magnetic inks and for use in magnetic fluid systems and thin film devices. Commercial quantities are Strain In Concrete expected to cost around three dollars per pound. Strains in concrete can be measured economically with a gauge developed by a British electronics firm. Low elasticity, long-term stability and high accuracy are other features claimed. Seeing By Infra-Red The instrument, a vibrating wire strain gauge, was initially A helmet that enables the wearer to see in the dark with- designed for its own use by the British Road Research Laboratory out himself being seen is being made by Physikaltsch Technische and has now been made available commercially. It will accur- Werkstatten, Wiesbaden, Germany. It weights about 21b and can ately determine slow-varying internal strain in concrete; for be fitted to any shape or size of head. The principle is that a beam of invisible infra-red light is projected from the front of the helmet, reflected back from the object to be seen and thus on to a photo- cathode sensitive to such light. It is converted there into a beam of electrons that strike a fluorescent screen and so produce a bright image. This is seen through the eyepiece of the image converter, which is fixed over one eye of the observer. The energy needed is supplied by nickel-cadmium cells clamped to the helmet and easily rechargeable. The voltage is stepped up in a small transistorised high voltage unit. Extra batteries or even a mains supply can be used for protracted use of the apparatus. The normal batteries give one hour's continuous use of both the light emitter and the image converter. Apart from military uses, the helmet can be used

Ampex Corporation's now VR-2000 colour-com- patible television tape recorder is capable of producing higher quality recordings than any previous recorder. A new "high band" record/ reproduce standard on the VR-2000 permits third . V generation tape copies equal in quality to present *** • ' v masters. Signal-to-noise ratio for colour or mono- •«» * chrome has been lifted to 45-46db. compared s?. with the previously accepted "best" of 42db, Radio, Television & Hobbies, June, 1964 21 I r. "iY- -r ?

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2% VERTICAL & HORIZ msBi

SPHDR BSHEDB ally rbsuuatep SUPPLi VHMP NUFACTUR0D T »w

A general purpose Sin oscilloscope providing high sensitivity, stable, high intensity displays over the lull 10 x 10 cm. area. Its lacilities make it ideal for servicing, X-Y plotting. TV and Pulse work, classroom displays and medical applications etc. Widely used in Australia and overseas under all climatic conditions. Full specifications on f request. DESIGNED & MANUFACTURED BY BWD ELECTRONICS PTY. LTD. TELEPHONE: 81-6188 67-69 BURWOOD RD., HAWTHORN, VICTORIA, AUSTRALIA 22 Radio, Television & Hobbles, June, 1964 having a long working life. This is normally recharged by the simple charging unit, when the vibrator is not in use at night. Charging time is approximately 6-7 hours. (Pye Limited, Faraday Electromedical Division, Bluetown, Sheerness, Kent, England. Australian agent: Pye Industries Ltd., Box 12, P.O., Marrickville, example those due to restrained thermal warping, expansion, contraction, shrinkage and creep. N.S.W.) The gauge is embedded in the concrete structure on which strain measurements are being conducted and, as the strain Logistics Ship in the concrete is proportional to the square of the frequency A complex television system with three basic facilities has of vibration, the gauge provides a simple and inexpensive means been installed on Britain's new logistic military transport ship, of assessing internal strains. Sir Lancelot. It comprises navigation and beaching, bow and The measuring technique involved has been in use for a stem door observation, and an entertainment and briefing tele- number of years, but the cheapness of the gauge enables measure- cinema system. A camera is mounted in a weatherproof housing ments to be made economically for the first time, claim the in the stem head of the vessel with a monitor in the wheelhouse manufacturers. (Deakin Phillips Electronics Ltd., Tilly's Lane, for navigation and beaching purposes. The camera has a narrow High Street, Staines, Middlesex, England. Australian agent; angle lens to assist in the observation of obstacles when beach- Richard Foot (Aust.) Pty. Ltd., 89 Elizabeth Street, Sydney.) ing. A range indicating system, projecting a pattern of illuminated lines into the camera lens, has been included for calculating Seeing In The Dark distance off the beach when a making a landing. (The Marconi A new electronic tube which can "see" in the dark, as it International Marine Co. Ltd., Elettra House, Westway, Chelms- multiplies the strength of the available light a million times, has ford, Essex. Australian agent; Amalgamated Wireless (A/sia) been produced in Britain. This four-stage Image Intensifier Type Ltd., 47 York Street, Sydney.) 9694 should be of particular interest to the Armed Services and astronomers. Another version, the Type 9692, has important ap- Automation For Laundries Aimed at increasing automation in an industry in which there is a manpower shortage, a grant for specific research has been made by the Department of Scientific and Industrial Research to the British Launderers' Research Association. A grant of up to £A9,000 has been made for the study of automated marking and mark identification, simplified magnetic data

1:^>- .. 7-751 I' M II II * ■ H V

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A new, light-weighty low cost, closed circuit TV system has been deyeloped by A.F.I. Ltd., New Parks, Leicester, England. Here, the system is shown installed in a security van, used for transporting bullion and large sums of money. The split image allows the driver to see people approaching the van from either direction on the remote side. Emerson & Cuming, Inc. have evolved a solution for the plications in nuclear and atomic physics. It is the first four- problem of bonding their flexible conductive gasket stage cascade image intensifier to be made available commer- "Eccosbield" fo metal. They now offer Eceoshield VCA, cially. a one-part conductive adhesive. (Details from Wm. J, When the Type 9694 tube is used for night vision, it can be coupled to a television camera and events can be viewed im- McLellan, Kingsgrove, N.S.W.) mediately on one or more TV receivers. In nuclear work the Type 9692 tube can be left unattended in darkness and, when storage of information and automatic shape recognition of the event which is of interest occurs, the picture on the outpost customers' articles. phosphor can be photographed by a camera of which the shutter This work forms part of a much larger project concerned has been left open. (E.M.I. Electronics Ltd., Britain. Austra- with the design and development of automated equipment for lian agent; E.M.I. (Aust.) Ltd., 301 Castlereagh Street, Sydney.) the racking and packing of customers' articles, the finance for which is being provided by industry and the National Research Development Corporation. Facsimile Newspaper The first facsimile newspaper transmission system in Europe has been inaugurated by Sweden's Dagens Nyheter (Expressen) Coloured Concrete using British designed equipment. This system makes possible A concrete mix for walls, steps, floors and paths which can the simultaneous printing of the newspaper at widely seperated be produced in any colour or with a polished marble effect, and places. which is claimed to have exceptional resistance to impact or A whole page is placed on the transmitter and, in 10 shock, is reported by Schering A.G., of 170-172 Mullerstr., minutes, a negative is received at the distant printing house. Berlin N65. Germany. A plate is then made for the press. Similar equipment has It consists of sand, gravel or clinker with glass fibre and already been supplied by the British firm to Japan's Asahi a resin binder. Further advantages claimed for the concrete are Shimbun and America's Wall Street Journal. (Muirhead and Co. that it will adhere to metal, glass, cement concrete, wood and Ltd., Beckenham, Kent, England. Australian agent: Watson Victor insulating materials and fresh material will bind well to that Ltd., 9-13 Bligh Street, Sydney.) which is already hardened. Artificial Voice Tough On Thieves A new pharyngal vibrator, or artificial voice, which enables Hats that resist a blow from a cosh, thief-resistant bags for the user to speak less harshly and in a more varied tone than carrying cash and bandit-proof trolleys for transporting valuables was possible with earlier vibrators, has been developed by a or cash are the three latest products of Security Equipment (Farn- British firm. The vibrator is for people suffering from a complete ham) of Weydon Lane, Farnham, Surrey, England. laryngectomy and now breathing through a tracheostomy, a The hats — bowlers or "pork, pies" — are reinforced by an tube fitted into the trachea. They have the choice of learning inner layer of glass fibre reinforced plastics and look no different a pharyngal voice, which can only be acquired through long from the normal headewar of this type. and expensive speech therapy, or they can speak by using a The cash safety bag has two compartments — one for the pharyngal vibrator and mouthing the words. valuables and the other for a mechanism which comes into opera- The power supply is derived from a pocket-size accumulator tion as soon as the carrier's thumb leaves a release pin. if the Radio, Television & Hobbies, June, 1964 s - —"— '.r - ■ \ >

\ ; /

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the Beetl r /

And what better Reverb can you gel than that pro- Yeah! Yeah! Yeahl the Hammond Model 5C will bring vided by the New Hammond Model 5C Reverberation Unit? you realism of sound reproduction such as you have never Half a minute's listening on either stereo or monaural before experienced. It's simple to install and so compactly equipment will give you an appreciation of the amazing styled that it can be easily filled to existing equipment. difference between non-reverberated sound and Reverber- ated sound which results when the Hammond unit is Be with the Beetles. Join the Hammond Reverberation switched in. Unit fans. Your Hi-Fi distribution center expert will tell The vibrancy of the strings, the exciting throb of the you all about the Model 5C or you can write for full percussions blended with brasses all take on a "you are there" reality when the magic of Hammond Reverberation technical details to Rola Special Products Pty. Ltd., The is wedded to your audio system. It works magic, too, with Boulevard, Richmond, E.I., Victoria, or any of the dis- guitar and accordion amplifiers. tributors listed below. DISTRIBUTED BY VICTORIA QUEENSLAND Carnegie (Australia) Pty. Ltd. NEW SOUTH WALES Lawrence & Hansen Electrical Radio Parts Ply. Ltd. General Accessories Pty, Ltd. (Old.) Ply. Ltd. General Accessories Ply. ltd. Martin de Launay Pty. Ltd. A. E. Harrold Pty. ltd. Lawrence & Hansen Electrical Ply. Ltd. General Accessories Ply. Ltd. SOUTH AUSTRALIA WESTERN AUSTRALIA TASMANIA General Accessories Ply. Ltd. W. & G. Genders Ply. Ltd. Healing (Sales) Pty. ltd. Atkins (W.A.) Ltd. Homecrafts — Tasmania. Carlyle & Co. (1959) Ply. Ltd.

Rola Special P RODUCTS PTY. LTD.

24 Radio, Teleyliion & Hobbiet, June, 1964 long and 7/16 inch in diameter. It is complete with lighting. The company has also demonstrated what it claims to be the smallest endoscope in the world—permiting visual inspection of the insides of cavities where the access hole is only three bag is snatched its handle clamps down on the thiefs fingers millimetres in diameter. and traps them and at the same time three telescopic arms shoot out to a 12-feet span and a whistle sounds. The arms make Air Filter it impossible for the thief to get into a car, get through a doorway An air filter designed specifically for preventing contamina- oi! through a crowd and he is unable to release the bag. tion of electronic equipment such as computers, control cabinets The trolley, suitable for use by banks, is made of steel plate and calculators has found a ready market among British electrical and carries four money boxes. It will carry up to five cwt. As and electronic companies for protecting expensive equipment soon as an attack is made the trolley extends telescopic arms over from dust particles. (Machine Control Ltd., Orchard Street, a span of 48 feet making it impossible to take it through gateways Crawley, Sussex, England.) or load it on a lorry. The steering also locks and a siren sounds. Various other "deterrents" are also built-in, but for obvious reasons these are not detailed. Hard-Hitting Hammers Hammers whose heads are filled with granulated steel are said to absorb the impact and to improve the blow in confined riel II in orbit i spaces. The heads are tubes whose ends can be filled with either steel or plastic stoppers to form the hammer faces. The U.K.-Ameriean satellite Ariel II (April issue, page:; Tahlen Hammer Company of 1,214 Poplar Place South, 9)- is orbiting with a maximum height of 13S7Km. and Seattle, Washington, U.S.A., says the movable loading in the head gives SO per cent greater impact than conventional hammers, a low point of 200Km. All three experiments are ; while the shifting of the granules absorbs some of the impact operating at intended and data Is being received over ,' instead of passing it to the handle. Because the steel grit aligns itself with the axis of the blow, full force can be given when the world-wide NASA data and tracking network. The !; the hammer is swung at an angle to the nail being driven experiments have to do with oxone in the upper atmosphere, galactic noise, and micro-meteorites.

Self-Cleaning Ovens Domestic ovens which clean themselves by burning off old spilled food have been introduced by the General Electric Com- pany of Appliance Park, Louisville, Kentucky, U.S.A. Setting a control dial to "Clean" brings an electric booster heating unit into play. This drives the temperature of the oven up to 850 degrees Fahrenheit, above the melting point of zinc, and burns off the stain. The resulting smoke goes to an after- burner where it is mixed with air so no smoke leaves the oven. The oven has extra insulation to prevent the high interior temperature from overheating the outside. Its door locks automatically as the temperature reaches 600 degrees, to avoid acci- dents. The cleaning cycle is reported to take two and a half hours. The ovens sell for about 70 dollars more than conventional ones of the same size. Extracts Water Birs Brit A.G. of Dufourstrasse 5, Basle, Switzerland, has patented a method of removing water from all types of chemical solutions, emulsions or liquid foods without recourse to distilla- tion. Danger of thermally decomposing the materials is thus avoided. The solution is dropped down a tall tower as fine rain while hot dry air or inert gas flows upwards. The last traces of water Training enough people lor skilled occupations is on are removed at the bottom —even from very hygroscopic urgent problem which, tts present laces Australian in- materials, it is claimed — by whirling the air and liquid around dustry. The Governor General, Lord De L'lsle (right) together in a vortex. Suspended solids also get thoroughly mixed watches AW A apprentice, Mr Phillip Sprott, liling strip- in with their liquids in this way and no sludge is left. per plate at the Company's Ashlield works. Mr J. Kilponen, Tool Room foreman, looks on. X-Ray Camera A scientific instrument of great interest built in Tasmania has been presented to Dr J. W. Mitchell, Director of the National Chemical Laboratory by Professor J. S. Anderson, Professor of Inorganic Chemistry at the University of Oxford, and an Australian. The instrument is an X-ray camera for the detailed analysis of compounds. Based on principles first put forward by Guinier of France and Hagg of Sweden, it is the only focusing mono- chromating X-ray device with an angular resolution of just over one minute. Another such instrument is already in use at the Atomic Energy Research Establishment at Harwell, England. This is a new development in the manufacture of scientific instruments. The Tasmanian Education Department Science Centre, Hobart, Tasmania, has made two, and one of these was presented free of charge. This is the first important research instrument to be made in Tasmania. Looks Around Corners A new British endoscope microscope—a microscope with an endoscope attachment which enables a viewing head to be placed in normally inaccessible positions—has been demonstrated by Optec Reactors of 54 Upper Montagu Street, London, W.I., England. The viewing head is connected to a glass fibre "tube" which transmits the image with virtually no loss of brightness or definition to the microscope. The latter provides x 100 magni- Boeing's new space simulation chamber, in operation at fication. Many possible applications include investigation of metal the Aero-Spaee Division at Seattle, closely similates fatigue in situ at points hitherto only accessible as a result of space conditions. Air pressure can be reduced to dismantling or destruction. Other possibilities include continuous 1 / 10,000,000th that ol sea level, achieved with the vetting of flow-produced materials such as plastics and textile aid ol Ion sputter, titanium sublimation and helium cryo- yarns, examinauons of corrosion and sludges inside pipes and pumps. Temperatures to as low as -280f. can bo im- tubes and many medical applications. posed in the 27 eu. It. chamber, while solar radiation One version of the microscope has an endoscope five feet can also be simulated to live times normal. Radio, Television t Hobbies, June, 1964 ■■ '

AUSTRALIAN MADE

00333 f II «*l> "^■STO, STI,t0

EILCO

FULLY

AMPLIFIER

This amplifier was the first high fidelity, completely TECHNICAL SPECIFICATIONS: transistorised transformerless stereo amplifier com- POWER AMPLIFIER: Power Output: 10 wettj RMS per mercially available in Australia. The power output channel: Output Impedance: 15 ohmi only. The amplifier of over 10 watts per channel is adequate for most is not suitable for driving electrostatic loudspeakers. applications. Source Impedance: Less than I ohm. Frequency Res- ponse: Power Amplifier minus/plus I db 55 Kc/s, minus/ The circuit design is such that no audio transformers plus 3 db 30c/$ to 25 Kc/$. Full power output is avail- or inductances are used, and the use of transistors able at all frequencies across a loudspeaker load. Dis- allows many advantages including freedom from tortion: Total harmonic distortion is 0.1% at 10 watts microphony, virtual elimination of hum internally gen- across loudspeaker load at all frequencies, Channel erated in the amplifier, economy of power consump- Separation: Better than 55 db. tion, low heat generation and immediate operation PREAMPLIFIER: inputs: I. Magnetic pickup; R1AA equal- without a warmup period. isation is provided for pickups with an inductance of Tone control circuitry is one of the Baxendall type, 500 mH i(most pickups requiring a 50 kcfims load are reducing distortion at all settings below full boost satisfactory). Sensitivity 4 mV. 2. Crystal pickup; RlAA equalisation is provided for most crystal pickups. Sen- due to negative feedback. Inputs are provided for sitivity 80 mV. 3. Radio; 150 mV into 100 kohms. 4. magnetic and crystal pickups, radio and an auxiliary Auxiliary; 150 mV into 100 kohms. Auxiliary Output: 100 socket which may be used in conjunction with a tape mV, maximum load 47 kohms. Both the auxiliary input recorder for either replaying tapes or recording pro- and output are available through a 5-pin socket. Signal to Noise Ratio: Magnetic Pickup 59 db below 10 watts; gramme on tape. Crystal Pickup 59 db below 10 watts; Radio 60 db below The transistors are protected against all reasonable 10 watts; Auxiliary 60 db below 10 watts. Controls; Input accidental overloads and the circuit is temperature Selector (Pickup, radio, auxiliary). Bass Cut/Boost, Treble compensated. The amplifier may safely be used in Cut/Boost, Stereo Balance/Mono. Volume/On-Off. Fre- any Australian environment. A high thermal con- quency Response: The Frequency Response of the complete amplifier and preamplifier with the tone controls ductivity aluminium chassis and case are used to in mid-position is plus/minus 3 db 55 c/s to 20 Kc/s. A restrict the temperature rise of the amplifier to a sharp cut filter rapidly attentuates signals above 20 Kc/s. minimum. this has Its maximum effect with the treble boosted, signals below 30 c/s are rapidly attenuated vo reduce The unit is provided with a wooden surround which turntable rumble. The base control has a range of plus 15 allows table-top operation; the surround may be re- to — 12 db at 50 c/s and the treble control a range of moved and the unit mounted directly in a cabinet. from plus 13 to — 17 db at 15 kc/s. BUY YOUR NEW "EILCO" STEREO AMPLIFIER FROM LEADING AUDIO STORES THROUGHOUT AUSTRALIA

DISTRIBUTED BY E1LC0 SALES, 233 RUNDLE ST., ADELAIDE, S.A. Tel. 23-3450

Radio, Television & Hobbies, June, 1964 SCIENTIFIC NEWS —cont.

mately l,900g. is exerted. The ARH centri- Glass Fibre Cloth fuge measures approximately 11J inches Cotton Freres and Cie., of La Sone high by 9 inches in diameter and has a (Is«re), France, has patented a way ot durable finish of hard cream enamel. It is making a particularly strong glass fibre available from A. R. Horwell, of 17, reinforced fabric at high speed and low Cricklewood Broadway, London, N.W.2., cost. A special weave is used to unite con- England. tinuous strands of glass fibre, which have high strength but poor adhesion to organic resin, with short discontinuous fibres that Window Fan are weaker but adhere well. The woven An electric fan for keeping car rear sheet, which may be of practically any windows free from condensation has been width and texture, is impregnated with a put on the market by J. De Koning Azn. standard type of resin. The product can be N.V., Oud. Beijerland, Holland. It is mount- used for anything from heavyweight mar- ed in a flat box on the rear window-ledge quees to lightweight dinghy sails. with a slit facing the window. The 35 W. 6 or 12-volt electric motor is concealed underneath and is operated by a dashboard Welding Stainless Steel switch. The fan box which looks like a With facilities for mono-stereo Bofors A. B., of Bofors, Karlskoga, Swe- rounded triangle from above, is only recording and play back, and den, has developed and patented a strong li inches high and 11 inches at its greatest stainless steel which, it says, is much length. incorporating 4 separate amplifiers easier to weld than most other stainless for maximum versatility. steels. It does not need to be specially Locking Wrenches heated prior to welding and it need not be welded in two stages with heating in Wrenches equipped with locking jaws are What the Series "420" will do: between. said to be proof against slipping off nuts 1. Mono records and plays back with and to hold worn nuts more firmly. The adustlng screws of the wrenches continuous monitoring on either Protects Windscreens are centred on movable Allen screws. When channel. Motorists who protect their windscreens the jaws of one of these wrenches are set, 2. Stereo records and plays back with with old newspapers when freezing rain or the Allen screw is turned to wedge the snow is expected can now buy a neat plastic adjusting screw so that it will not turn. continuous monitoring on both cover held in place by magnets at the The Finn Tool Company, 2,508, E. Cook channels. corners. The magnets cling to the steel of Street, Springfield, Illinois, U.S.A., sells the 3. Plays back four-track pre-recorded the car body and the plastic covers the wrenches for slightly more than the price glass. Any ice or snow coats the plastic, of ordinary ones. material (Model 424 only). which can be stripped off, leaving the wind- 4. Plays back on one channel whilst screen clear when the car is to be used. recording on the other. Sunset House, Sunset Building, Beverly Combats Grime Hills, California, U.S.A., sells the cover Cars, agricultural machinery, metal sheet 5'. Re-records from one track to the (catalogue number 6492) for two dollars. and components of all kinds can be quickly other. and easily protected for long periods by a spray-on aqueous emulsion reported by 6. Whilst re-recording, permits addi- Water Purifier tional material to be super-imposed. Apparatus small enough to fit on to the back of a lorry and said to be capable of 7. Permits instant comparison of quickly purifying water to make it safe to recorded signal with input signal. drink has been designed and patented joint- 8. Permits the introduction of echo ly by J. L. J. Vellas, Rue Saint-Aubin, and L. C. Puig, 13, Avenue d© Lombcz, effects. Here, for the first time, is an instrument so versatile that it is difficult to conceive a need that cannot be instantly satisfied. Ferrograph Series 420 is the result of a close study of user requirements based upon a comprehensive survey in which several thousand Ferro- One of two iunetable frequency graph users took part. The advanced doublets available from the Telonie standard of performance once again Engineering Co., Laguna Beach, Cali- demonstrates Ferrograph's mastery of fornia, U.S.A. The units cover the the art of tape recording. Write for ranges 0.5 to .85Gc. and 0.6 to IGe., details of the two models 422U and Sanders Associates Inc. ot Nashua, with a conversion loss of 3db maxi- 424U. . . also the manual Series 5. New Hampshire, U.S.A., hare de- mum and an output of 1 watt, (De- veloped this solid-state switch, with tails Jacoby, Mitchell & Co. Pty, Ltd., SOLE AUSTRALIAN AGENT; a speed of less than 2 nanoseconds Sydney), and designed lor a frequency range DC to 200Mc. RF power handling is 250mW., insertion loss 2db maximum Deutsche Akademie der Wissen-Schaften zu Tape Recorders Berlin, 116-125, Rudower Chaussee, Berlin- and control 15 volts at 42mA. Adlershof, Germany. The coating is prepared by melting four PTY. LTD. both of Toulouse, Haute-Garonne, France, wwaxy components in a heated container and, 60 Clarence Street, Sydney The crude water is passed first between at 90 degrees Centigrade, adding warmed charged electrodes, which causes most of wwhite spirit. Water is then heated to about the harmful impurities to flocculate j»'95 degrees Centigrade and added, followed Telephone 29.1571 together; then into a settling chamber; then b;by ammonia. The emulsion is then rapidly through sand and charcoal and, finally be- c

What to do about TVI problems

Last month we presented the problems, facing the 52 Mc/s amateur size tagstrip and not the miniature operator, in keeping the radiated carrier clear of harmonic content. variety now available. When the filter has been satisfactorily fitted, warn the This month we outline the steps necessary at the TV set to eradicate owner not to fiddle with the adjustment. TV| faults caused by fundamental overload and/or audio detection. In If the owner of the TV receiver does this article we also discuss TVI problems as related to the 144 Mc/s not wish to co-operate, then the amateur must follow the regulations set out by amateur operator. the Postmaster General's Department and inform the local radio branch. Usu- ally, the TV owner is quite happy to By Keith Woodward co-operate, as long as it is explained carefully that it will not be necessary SHOULD the occasion arise where a used in these networks should be set to to touch the inside of his TV set. nearby TV receiver is suffering from frequency with a GDO. A temporary If the question of the TV mainten- fronl-end overload, the trouble may be short across the series-tuned circuits will ance contract is raised, then it is sug- tackled with all the more confidence if also allow these to be set with the gested that the company holding this it is known that any spurious frequencies GDO to the transmitter frequency. contract be contacted. Normally, these generated within the transmitter have When these filters are installed after companies are quite willing to co-operate been reduced to a minimum. Incident- alignment with a GDO, it is quite often with the amateur operator. It is very ally, it is a good idea, when erecting found that they require no further tun- wise for the operator to ensure that his your aerial system, to place it well above ing. If tuning up the filter in situ, own TV set is completely free of TVI the line of adjacent TV aerials or, fail- be careful that it is not tuned to the and this can often be used as a demon-1 ing this, well below the line. As men- TV channel instead of the transmitter stration that the "queer looking thing' tioned before, cross polarity between TV frequency. It is good practice, when on the aerial terminals does not affect aerials and the transmitting aerial can building the filter shown in figure 1c, to TV reception. also help reduce the nuisance. Unfortunately, we have not been able shield the sections from one another. to evaluate the sharpness of these filters If the TV set is being overloaded Typical inductors for 52 Mc/s. using directly by 52mc carrier, this must be 3-30 pf Philips trimmers, would be 11 when compared with the new channel attenuated before it reaches the tuner of turns of 18 SWG, 3/8in diameter and the set. This entails the use of a fre- approximately lin long. These coils quency selective circuit at the aerial ter- mount very nicely on a four tag, solder minals of the TV receiver. The con- tagstrip. The mounting foot on these Part Two figuration of this network depends upon tagstrips can be used to mount the filter the severity of the interference. on the TV receiver's aerial terminating 144-148 Megacycles Figure I illustrates three approaches screw. Be sure to ask for the standard to manufacture of a frequency selective IV AERIAL "O." We would suggest that the 52mc network. Either the TERMNALS W lb) operator keep his transmitter frequency capacitance or the well above 52 Mc/s when operating in inductance may be a channel "O" area. This may allow variable to achieve JOO OHM JCO OHM TV AERIAL resonance at the RIBBON RIBBON Ll TERMINALS the overload filter to be effective on the transmitter fre. transmitter frequency without introduc- qucncy. If the in- ing serious losses on channel O reception. ductance is made Before proceeding beyond the aerial variable it is sug- terminals of the TV set, it may be a gested that the capa- good plan to interpose consideration of citor does not ex- TVI problems in relation to the 144 Mc. ceed 12 pf. For band. JOO OHM j TV AERIAL Charts one to six illustrate the har- reasonably mild RIBBON TERMINALS monics. up to the tenth order, generated cases of front-end by the popular crystal or VFO fre- overload, either the qencies used on the 144Mc amateur circuit shown in la band. Harmonics which normally should or lb will suffice. flq. I not cause trouble have been omitted For a severe case from these charts to conserve space for of overload, the con- The above circuiii, when resonated to the transmitter more important matters. figuration shown in frequency, should prove effective in alleviating funda- The use of a 6Mc fundamental fre- 1c is recommended. mental overload of TV receivers. Either inductance or quency, shown in chart 1, would not seem The parallel circuits capacitance may be made variable. to create many problems. However, for a true picture of harmonics that could be developed this chart should be com. a bined with chart 4 showing harmonics > ten of a 12Mc fundamental. Owing to the high multiplication factor i ; required, the use of a crystal at 6Mc m, is not recommended. If used in an t r overtone oscillator to 18 megacycles a I 1 slight improvement would be achieved. A very common fundamental fre- JlUUt ' • quency for 144Mc transmitters, shown / I - .SB, isa in chart 2, is 8Mc. Here again the \ The charts, to bo found on the opposite page, clearly show the harmful effects of The interior view of our 144 Mc/s filter shows the simplicity of the con- frequencies generated in the struction. When the additional end and side are soldered into place the whole early stages of a 144 Mc/s assembly becomes quite rigid. transmitter. 28 Radio, Television & Hobbies, June, 1964 CRYSTAL OPERATING CRYSTAL OPERATING OR V.F.O. 6* 8i FREQUENCY OR V.F.O. 6* 7i e< 9« lOx FREQUENCY 6.l66Mcs. 37Mcs. 49.333Mc». 148Mcs. 8.222Mcs. 49.322Mcs 57.666Mcs. 65.776Mcs. 74Mcs. 82.222Mcs. KSMcs.

147Mcs. I47Mcs,

TV TV TV TV TV COMMER- COMMER- I.F. CHANNEL CHANNEL CHANNEL CHANNEL CIAL CIAL 0 I46Mcs. 0 I 2 SERVICES SERVICES l46Mcs.

145Mcs. KSMcs.

6Mcs. 36Mci. 48Mcs. I44Mcs. BMcs. 48Mcs. 56Mcs. 64MC5. 72Mc». SOMci. I44Mcs. CHART I CHART 2 CRYSTAL OPERATING OR V.F.O. 4« 5* 7* 8s 9s 10s FREQUENCY CHANNEL FREQUENCY 9.25Mcs. 37Mcs. 46.25Mcs. 64.75MC5. 74Mc5. 83.25Mcs. 92.5Mcs. KSMcs. Mcs. 0 45-52 • 1 56-63 92Mcs. 2 63-70 K7Mcs. 3 85-92 4 94-101 TV TV 5 101-108 TV CHANNEL CHANNEL COMMERCIAL COMMERCIAL 5A 137-144 I.F. SERVICES SERVICES TV K6Mcs. 6 174-181 0 2 7 181-188 CHANNEL 8 188-195 3 9 195-202 KSMcs. 10 208-215 II 215-222 AUSTRALIAN TV CHANNELS 9Mcs. 36Mcs. 45Mcs. 63Mes. ZZbdSi 81 Mcs. 90Mcs. I44Mcs. CHART 3 CRYSTAL OR V.F.O. 3s 4s 5s 6s 7x 8s 9s 10s I2.333Mcs 37Mcs. 49.332Mcs. 6l.666Mcs. 74Mcs. 86.333Mcs. 98.66Mc5 1 1 IMcs. l23.33Mcs. KSMcs.

TV CHANNEL K7Mcs. 3 TV TV TV TV I.F. CHANNEL CHANNEL COMMERCIAL CHANNEL COMMERCIAL COMMERCIAL 0 1 SERVICES 4 SERVICES SERVICES K6Mcs. 85Mcs.

KSMcs.

l2Mcs. 36Mcs. 48Mcs. 60Mcs. 72Mcs. 84Mcs. 96Mcs. lOSMcs. l20Mcs. 144 Mcs. CHART 4

CRYSTAL 2s 4s Ss OPERATING CRYSTAL FUNDA- OPERATING OR V.F.O. 3s FREQUENCY OR V.F.O. MENTAL 2s 3s FREQUENCY 24.666Mcs. 49.332Mcs. 74Mcs. 98.666Mcs. l23.33Mcs. KSMcs. 37Mcs. 37Mcs. 74Mcs. 11 IMcs. KSMcs.

• ' I47Mcs. K7Mcs.

TV COMMER- TV COMMER- COMMER- COMMER- CHANNEL CIAL CHANNEL CIAL TV I.F. CIAL CIAL 0 SERVICES 4 SERVICES K6Mcs. SERVICES SERVICES K6Mcs.

KSMcs. KSMcs.

24Mes. 48Mcs. 72Mcs. 96Mcs. l20Mcs. 144Mcs. 36Mcs. lOSMcs. l44Mcs. CHART 5 CHART 6 Radio, Television & Hobbies, June, 7964 29 leading electronic installations*

prove the versatility

of the IMHOF-IMLOK SYSTEMS

MHOFS CABINETS 1 mmmmmz?*.

(Above) Special modular chassis system developed by Aladdin Design Engineers and Consultation with Royal Australian Navy. The P.M.G., T.A.A., A.W.A., Universal Electronics, Electric Control & CONTROL CABINET Engineering, Automatic Totalisators, Ducon Condensers, Royal Australian Navy Research Laboratory—all these famous organisations have proved the versatility of Imhof-lmlok in many unique applications throughout Australia. For specialised advice on how these systems can work for Complete series of varying you phone us today .or mail the sizes are available to meet your specific application. TWIN RACKS coupon below. SEND THIS COUPON

ALADDIN INDUSTRIES PTY. LTD. 43-53 BRIDGE ROAD, STANMORE, N.S.W. 51-2826. Please send me details of Imhof-lmlok System.

INTERSTATE AGENTS: T. H. Martin Pty. Ltd., Brisbane: Austral Lighting, Townsville; Equipment Control Pty. Ltd., Melbourne; Address Warburton Franki, Adelaide; C. L. Sedunary & Co., Perth.

Radio & Hobbies

SO Radio, Teleyltion A Hobbiet, June, 1964 number of harmonics generated is quite high. The benefit ^ „ ^ of overtoning these crystals to the third overtone can be 4 _ seen in chart 5. Automatic reduction is achieved in the T j possibility of interference to TV channels 1 and 2 and J I also commercial services between 80 and 80.22Mc. ' i An uncommon crystal fundamental, shown in chart 3, | t j — 1^ is that of 9 megacycles. Perhaps this is fortunate, as a J- r-L-| high order of multiplication is required, thus creating more I I possibilities of harmonic radiation. In the case of a 9Mc T ~ ~ ^ » |»ij crystal, we cannot resort to overtone operation to reduce i caoactgr .^- ^ these harmonics. ~ , ~ Chart 4 illustrates the use of a 12 megacycle fundamental I BEN^ p frequency. While reasonable results will be achieved with -J — this fundamental frequency, the marked improvement when ■ used in an overtone oscillator circuit is illustrated in chart 6. _ cgnnecgr r- = s Chart 5 and 6 indicate the lowest starting frequencies , ' favoured, 24 and 36 megacycles, for 144mc operation. It i I is quite obvious that the higher the starting frequency the T bend up r ^ smaller the number of harmonics which are generated and i ^ '■ therefore the smaller the number that will need suppressing W ~J in the transmitter. j 16 r " Having chosen the fundamental fre- mtirirrrTtrtrt -I quency of the oscillator to be used, dL" up [ bend — it is then necessary to consider the steps The coaxial filter - i required to achieve suppression of the mar be construct. rend i'p 1 unwanted harmonics likely to be gener- ed from one sheet - ated. These steps correspond with those of tinplate. The L 1 outlined in this article last month — shaded areas 15f .4-—4"—«J - j good shielding and the correct coupling t/,ow unused ma. methods between stages. Since it is tertal. Dotted difficult to achieve high "Q" circuits at j;_., ' <0ij, 144Mc efforts should be made to achieve and eo„t!nuou, high harmonic suppression before the /inej where the final stage is reached. . material is to be 1 Use of double tuned circuits, em- . I —U ploying inductive or link coupling, be- " 2 0' H tween all stages will considerably reduce ,*»************** c g 2 these harmonics. Where harmonics are cation'if may'be m-LTsa'rv^use^serles- ceivine end ancl. if correctly constructed, structed first. This piece has one end tuned'traps to remove them This is should not exceed 1 dB. All harmonics, sealed and the other end open. The soeciallv feuuired where the full power and sub-harmonics, generated in the open end is soldered in the centre of L belns used dBtransmitter0r should be attenuated by 50 the end piece of the outer shell, which However, having taken all necessary ,1 ^ore, by this filter, when cor- has a Hn right-angle bend. Alongside steps to reduce these harmonics in the recdy fi,tted and terminated. the centre piece we soldered the two transmitter w* mav still he ohliced to Details for the construction of our strips which later connect to the coaxial use a device between the transmitter 144Mc filter are given in figure 2 and connectors. and the aerial which will remove the the photographs clearly show the sun- Having drilled the three holes in the remaining traces. plicity of the construction. Tinplate. outer section this was then bent into a Having learned from our experience so'd 'n standard sheet sizes of 20in bv square section "U" shape. At one end with filters on 52Mc. we immediately 28in, was used in the construction. Only we soldered the retaining pieces in place planned the consiruction of a coaxial one sheet is required and, at a price of for the perspex support. approximately 4/, centre piece was novv placed in cos 1S s tu and ■ . ver■ 1 ow' njh ' centred carefully. After solder- ^1^. ^1^ y . , * Utner jng in piace the coaxial connectors materials required Bnt[ tuning capacitor were placed lin are a p RFC II iok | | , double- pOSition anc| joined into circuit. The —II—I HI t AW * I --- I spaced capacitor, a fi t photograph shows the filter at this sma11 S ecUOn rs I I 4cnlp :l|^| P rSpeX tt W0 coaxia ^ stage. Having reached this far, tempor- | : VS/ f T VS/ ® f' c ' arily connect a loop to one of the co- sOpFS > 'mmr X X. connectors ana axja] flttings and check the frequency T f J —1 ■ • > 1 Plenty of solder- of the filter with a GDO. The filter -1- S f ^ We do recommend should be tuneable over the full range ■ , " ' f I m j f I that both this filter of 144 to 148 Mc/s with the capacitor and our 52Mc filter used. All that remains now is to fit Fig. 3 " 'be painted, when the final piece of tinplate and connect constructed, as a it in your aerial feed system. HiherEither ofol these circuits should prove successful in curing safeguard against Kcturning to our troubles with TV Kf detection in an audio amplifier, normally caused by corrosion. sets in regard to front-end overload non-linearity of the stage. jhe Itin square we find that this complaint is not so filter resonating in the 144Mc band. The centrepiece was con- (Continued on Page 35) shape of a coaxial filter is directly related p—————— to the "Q" obtainable but the more effi- _ cienC shapes would be difficult for KT" the home constructor to manufacture. Being limited by the shape factor, our 144Mc coaxial filter was constructed to a size where the maximum efficiency could be achieved. While the sharpness of this filter will not be readily apparent to the casual observer, it is not recommended that BBB it be used in conjunction with the receiving aerial, unless you are willing to retune it when shifting over a range IB greater than 300 Kc/s. The insertion loss as checked with several stations I-—-————— on 144Mc was unmeasurable at the re- The coaxial filter in its final form is capable of efficient operation. Radio, Television & Hobbies, June, 1964 PUT A IN YOUR FUTURE

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AUSTRALIAN i OVERSEAS AGENTS: VICTORIA: WM. J. McLELLAN & CO. PTY. LTD., A.E.E. CAPACITORS PTY. LTD., The Crescent, Kingsgrove, N.S.W. 50-0111. 202 Bell Street, Preston. 44-0491. Other sales enquiries to QUEENSLAND: K. H. DORE & SONS. TASMANIA: W. P MARTIN PTY, LTD.. NEW ZEALAND: H, W CLARKE (N.Z.) LTD., 505-507 Boundary Slreei. BRISBANE. 188 Collins Street. HOBART, 42-46 Cable Street, WELLINGTON. C,3. SOUTH AUSTRALIA: B. L ANDREW & CO LTD., WESTERN AUSTRALIA; I. W. HOLMAN & CO.. H. W. CLARKE (N.Z.) LIMITED, 102 Gilles Slreei, ADELAIDE. 249 James Slreet, PERTH, 10 Teed St.. Newmarket. AUCKLAND, S.E.i.

32 Radio, Television & Hobbies, Jane, 1964 MORE ABOUT

TRANSISTOR IGNITION

Our past articles on transistor ignition were extremely popular and resulted in many of the major components required being sold out shortly after the issues appeared on the news stands. In this article we give details of alternative components which we have few found to be satisfactory. Also given i$ information on a "deluxe" high power version of our previous ignition units. p By Keith Jelfcoat TpOLLOWING Ihe publication of our not been available earlier were now and OC20 could be substituted in ALL ■I second and third articles on tran- available in quantity. of our circuits without any change of sistor ignition, we received a barrage of So. armed with this knowledge, we value in the other components. The phone and mail inquiries from readers procured samples of the alternative types prices of these transistors are still chasing after components. Many of of components and set about testing them slightly above that of the 2N174 we orig- these wondered why we had not speci- in our circuits. inally recommended but Ihe difference is fied alternative types. We could not simply look at Ihe char- not prohibitive. In our own defence, we must say acteristics of these components and okay At a slightly higher price again, tran- that, prior to publication of our articles, them for our designs because, although sistor types 2N1412. 2N1099 and we had consulted with manufacturers a transistor ignition circuit looks quite 2N1358 may be used with no alteration and importers of semi-conductors and simple, small changes in values can of circuit values. determined that the components speci- mean the difference between the circuit If price is no object, or if you should fied were Ihe ones then available which working effectively or being run in a happen to have them on hand, transis- best met all three of the following re- condition which might result in prema- tors type 2N5I2B. 2N513B and 2N514B quirements: (a) electrically suitable for ture failure of a component. could be used. With these latter our circuits: (b) available in some quan- As a result of these tests, we found transistors, however. Ihe forward base tity. and (c) were reasonably priced. that the transistor types 2N1I00, ADZI2 bias resistor will need to be DECRHAS- At the lime of going to press we felt, on manufacturers' advice, that adequate supplies of specified components were on ☆ hand. However, both the manufacturers and ourselves were totally unprepared S) for the huge demand which was to fol- Our new "do low. As mentioned earlier, stocks were luxe" unit may be soon depleted and we had to reappraise used with either Ihe situation regarding alternative com- of the colls shown I ponents. above. The layout Even between Ihe time of our original alterations arQ_ articles and our reappraisal, some changes had taken place in the semi- few, but these conductor field so that transistors, which photographs will f. we had originally rejected because of serve to illustrate their cost, were now an economic pro- the changes. position: furthermore, others which had

-H.T. BALLAS' ' -lELECTRONICS" i.sn sow IGNITION IGNIION IJ— TRANSFORMER WA-O SWITCH o OR "RO-FO" IGNITION STANDARD RED TR5IOO/I8 SWITCH COIL POINTS ORANGE PLUG wiring 8.2n FOR 12V (WIRING SlDEi H.T 4.2n FOR 6V l2FIO.I2fl 5 MAUVE 1Z27T5.SZ27C. 5W IN 48 INI 99A 1 '.r. Z36270 2NII00 2NI4I2 iw BYY24.8YY22 OC20. ~ 470 & iw O* rELLOVv : CD 47n•i ■, J- 200oF SOCKET WIRING CD Siw YELLOW- -IZ27T5 SZ27C. (WIRING SIDE! ZJMZO. HT I2FI0.I2FI5 □ 2NII00.2NI4I2 © CD W248C.e DRANGc Qcza 1NII99A.BYY22 SOCKET o9o RED POINTS WIRING o * "TELECTRONICS' [WIRING SIDE) BALLAST & *8.20 FOR 12V IGNITION i.sn >-o^ STANDARD ' TO FOR 4V TRANSFORMER SOW PLUG WIRING COIL 5W OR "RO-FO" (WIRING SIDE) IRSIOO/18 NEGATIVE GROUND Alternative types of transistors plus xener and power diod es are shown on the circuit diagrams of our "de luxe" units. Radio, Television & Hobbies, June, 1964 33 RADIO PARTS PTY. LTD. . /a r/A MELBOURNE'S WHOLESALE HOUSE REGISTERED OFFICE: 562 SPENCER ST., MELBOURNE Phone: 30-1251 (9 lines); Orders, Direct line. NEWSLETTER 30-2224 City Depot: 157 Elizabeth Street, Melbourne Phones: 67-2699, 67-1967

LD.R.

PHOTO-ELECTRIC SWECHECK INSTRUMENTS LM.BEAM UNIT RELAY

The SWE-Check L.D.R.-SysTem has been designed to meef the rapidly increasing demand for a small, compact and ULUcommuHiT inexpensive unit, capable of handling SWE CHECK . the majority of beam-controlled appli- i INSTRUMENTS cations desired for industrial and domestic markets. A number of possible applications are listed below: The L.D.R. Control Unit is sensitive enough to successfully record beam in- terruptions at a rate of 1-500 times per minute up to 30 feet. It is fitted with a twin-contact changeover relay, thus making it possible to control several auxiliary devices simultaneously. Max. voltage applicable across relay contacts 500 volts. Max. current: I amp.

APPLICATIONS: As the number of applications are limited only by the imagination of the individual, here are but' a few: I. Across doors and openings in factories, shops, 4. On production lines operating relay counters,

offices, houses, etc. ^ Smoke de+ec+or.

2. Automatic doors, fountains, etc. 6. Switching neon signs, etc., on and off at dawn or dusk. 3, Burglar alarm (with infra-red filter). 7. As an accurate timing device at races, etc.

PRICE £35 inc. Tax

SEE OUR WORKING MODELS AT ELIZABETH AND SPENCER STREETS

34 Radio, Television & Hobbies, June, 1964 ED in value by approximately 20 per some details of a "de luxe" unit we have In order to obtain maximum HT volt- cent in order to ensure proper switching, constructed. age with this new unit it will be neces- If the base bias resistor in our circuit This "de luxe" unit uses the same sary to slightly increase the induction was for example 5 ohms then it would metal case and basic layout as the units current to the coil. Total current drawn need to be replaced with'a 4-ohm unit, in our April issue but the transistors by the unit (points closed) should be If this resistor were specified as 10 specified for it all have 100-volt ratings. 11 amperes with the ROFO coil and 8 ohms then an 8-ohm unit should be It will be noticed, further, that the cir- amperes with the Telectromcs coil. The substituted cud shows three zener diodes in series ballast resistor should be adjusted to give Those readers who have experienced between the collector7 and base in lieu these values. . , , Uliiiwuiiydifficultv J 111in vuiaiiiiiifiobtaining... . theniw A--—12F10 • />•and t ofT*1 the two ...1_ "in _ series,L.. used, ^previously. , r-a ., The ryanar-physical rlJ* I jposition ■• r cV* 1 occupiedrwlJra IT1• tn#>.U„by 11the n__ 12F15 power diodes originally specified Those who have followed our pre- three zener diodes is shown in the un- could substitute the following types with- vious articles will realise that this com- derchassis photograph we have included, out circuit alteration: 1N248C, 1N1199A. bination allows the development of a Full details on the construction of this BYY22 and BYY24. These diodes have higher primary back EMF from the coil unit were given in the April issue and ratings and prices which are close enough and, as a consequence, will result in an we will not repeat them, to the original units. increased HT voltage being available. POLARITY REVERSAL At higher ratings and, of course. The increased ratings or the transistors jn ^ issue (page 57), we gave higher prices, are the following diodes: specified also means that the small case 0f tf,e polarity of a positive 1N249C, 1N250C and BYY15. These (see details in April issue) is an adequate grounc| vehicle could be reversed to make last three should work without circuit heat sink for the transistors to be used jt negatjve ground. At that time, we changes but we have not actually had with either the ROFO or the Telectromcs 0[T1jtte(j t0 mention that the connec- the opportunity to test them. coil. ■ j • . j:„ lions to the primary of the conventional Readers in trouble with zener diodes We have given revised circuit dia- ignjt;on coj] should also be reversed to could directly substitute types SZ33C or grams of both a negative and a positive agree witj1 the new p0iarity of the SZ30C for the units recommended or ground version of this de luxe unit but ^jgig could use a single Z3B600 in place of intending constructors should note that In all of our circuits, the existing the two diodes shown in series on the the zener diodes shown on ^ ignition coil is retained for emergency circuit. . will only be necessary if the ROFO coil ^ and reversing these leads wiII ensure Readers who propose to use certain is used. Those who use the Telectromcs that> if nee(je(j the coil will give a of the components we have just men- transformer can omit the ciodes s correct polarity for effective tioned might care to make fuller use of the maximum back EMF developed by i^nition them in obtaining an extra 3,000 to this transformer will always be ess than s ^ ^ ^ we a|so suggested 4,000 volts of HT from their, ignition the maximum voltage rating of the tran- reversing the conneCtions to the petrol system. To this end we are including sistors specined. gauge. A reader from Port Kembla has — — pointed out to us that, with gauges of _ A k. I PN T\/l the fwo coil moving iron type, this is THE VHP BANDS AND TV I '■ ^ ^ . Where petrol gauges are fitted, we (CoDtlmied from page 31.) suggest that the needle position be nrevalent on 144 Mc/s as it is on 52 step by step through the audio chain checked before and after polarity reversal Mc/s Should this trouble be encoun- to ascertain where the signal is entering and, if no change m position takes place, tered then the circuit configuration of the set. When this point is located, the the gauge be left as is. If the needle ^ tîbrr^traêdtTreson0^ ^'make'f close ^ckthe^type ^ cSsir"18 baCk 111,0 9 ,0ne lâd^lead reversal might'damagemight damage "if,it. 6 mi on a TV set where channel 5A is being r " " used by the local TV station. In the event of audio rectification taking place in a TV set, either from 52 or 144 Mc/s transmissions, the only The most advanced complete cure available is filtering in the audio stage of the set. This means that the TV chassis must be removed ^ electronic ignition from the cabinet. — (RESD.) It is suggested most strongly that the 01 amateur does not undertake this ser- system vice, Even though no damage is done to the TV set during this process, it is likely that the TV owner may blame Increase engine power up to 10 p.c. more torque for hills, the amateur for some future fault that up to 20 p.c. more m.p.g, at cruising speeds, limits plpg foul- may appear in his TV set. Also, should this TV be under contract maintenance, ing, increases plugs and point life to 50,000 miles eliminates the contracting company can claim that tune-ups this disturbance of the TV set invali- dates the contract. Choose the system used by some of Australia's top racing The job should be done in conjunction cor drivers—Hi-fire, for assured reliability — seven racing with a TV serviceman acceptable to all successes in two weekends! parties. It is quite likely that the TV serviceman will not be familiar with Fleet vehicles, racing cars, buses, speed boats and cabin audio rectification faults so that your cruisers are among the satisfied Hi-Fire users, not to mention friendly co-operation would be welcome. many private owners of Mercedes to Mini Minors, all obtaining Figure 3 shows two methods used to eliminate the rectification of RF in the improved performance and economy. grid circuits of audio amplifiers. The See April '64 issue of R. TV & H. for technical details. RFC in section "a" must be effective at the frequency of the transmitted car- Comprehensive installation Kit 6 or 12V, plus or — earth. rier. The 50 pf capacitor disposes of £29/12/6 incl. tax, postage, packing, TRANSFORMER and any remaining RF. The alternative is ballast only £14/17/6. Insulated contact kit for R, TV & H. possibly a cheaper way of achieving the constructors, 15/-. same result. Keep all the leads to the grid of the valve as direct and short as Write tor tree illustrated pamphlet. possible. It is a wise precaution to give a test TELECTRONICS PTY. LTD.—224 Vieforio Ave., transmission before returning the TV set to its cabinet. Should the audio still CHATSWOOD, N.S.W. 41-8529, 40-2370 be evident it will be necessary to check Radio, Television & Hobbies, June, 1964 -- i rt*:, - w. ■ | | • -

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36 Radio, Television & Hobbies, June, 7964 MAGNETISM IN THE WRONG PLACE■ kn^k TOMSK."would hang on to the instrument ^ in a An old saying has it that many natural phenomena and commodities 'vigorously.a^pre" are "very good servants but very bad masters." The implication clearly ciate how the surgeons felt when faced is that they are useful in the right place and when under control but, with the same problem. perchance, highly undesirable when they occur in other circumstances. More important, I now had a good tl , i l x . x n . /l i . x- idea of how bad it was, and this in- The story I am about to tell suggests that permanent magnetism may forrnation wou|d be handy if my first well qualify for this definition. attempt was only partly successful. At least I would know I was on the right READERS may remember how, a few course of stitching a typical wound. By track if I could even reduce the effect, months ago (December 1963) I came combining the two, the surgeon need use Next 1 visited my "Discarded Com- to the aid of a customer who is a surgi- only one instrument to do the whole job, ponents Store Room," a small cupboard- cal instrument repairer by profession, thus saving considerable time. like room off the workshop. (Mrs Saddled with a complex surgical dia- And it was against this background Serviceman calls it a junk room, and is thermy unit suffering from an intermit- that the customer presented his prob- forever pestering me to throw the whole tent fault, and having virtually no lem. This particular instrument had be- 'o'. O"'- However, my Scottish ancestry electronic knowledge, he turned to me come magnetised — how, no one knew strictly forbids any such drastic action), for assistance.. — and was a source of considerable . lcrri n wiKiniKir' Happily, the problem turned out to be embarrassment to the surgeons using it. UStrUL WINUINt? not too difficult and I was able to get The trouble was that it refused to re- 1 soon found what f wanted; an old the unit working to everyone's satis- lease the needle promptly when the jaws electro-dynamic speaker whose cone had faction. Apparently this created a fav- were opened, fnstead, the needle had to long since fallen apart and whose trans- ourable impression, because the same be shaken or pulled off; an irritating and former was missing. The only reason customer turned up again recently with time-wasting procedure which seriously I had kept it was because it seemed another medical equipment problem, upset the normal routine of the job. such a shame to throw away all that though of a quite different nature. So, could I possibly help? nice wire in the field winding. Now my My first clue to the nature of the natural caution was paying dividends, problem was in the form of a question. BACK TO EARTH because it was the field winding f OW t 0 ou a ^steelj object?iv "9'^' ' ^ demagnetise ^p mdown afra tj0d earththe request with a ratherbump. broughtI real- wanted.Fortunately, the speaker was one of "Simple," I replied, "Just surround it ised how easy it is to say a thing is the real old timers, using bolted con- with an AC field." (I admit that this is a easy, yet how difficult it might be to sub- struction rather than the later welded simplified description of the process, but stantiate such a statement when some- assembly. A few minutes with a screw I felt that it was adequate for the oc- one takes you up on it. In other words, driver and pliers and I had the winding casion — and perhaps a little more just because a process is relatively free from the frame. A check with the impressive as well!) simple, or even because it uses simple ohmmeter confirmed that it was still equipment, it doesn't mean that one can intact, and I hoped it hadn't developed STRANGE DEVICE produce the equipment and carry out the any shorted turns during its long period Thus encouraged, my customer fished process at the drop of a hat. Yet this of inactivity, in his pocket and pulled out a strange rnay be the unfortunate impression ere- s0 now | had what might be a suit- looking object. I didn't need to be told ated when one exclaims, "That s easy! able winding. The next thing to decide that it was some kind of surgical in- However, having stuck ^my neck out, was how much power I should apply strument, though 1 hadn't a clue what I felt bound to at least "give it a go." to it, or, rather, how much 1 could its precise function was. Of stainless After all, it mightn't be so hard and, apply — with safely, steel, it gave me the impression that it in fact, an idea was already forming in ^ winding was a conventionaI had started out to be a pair of scissors, my mind as to how I might tackle it. )500 ohm type and woll|d norrna|iy changed its mind half way in favour of I suggested that the customer leave have had about 100 volts DC applied a pair of long-nose pliers, and finished it with me and, as work was a little t0 jt hs combined role of field coil up not making much of a job of either, slack at the moment, I intimated that cl|m jjiter choke. On this basis it did As it turned out, this impression I would tackle the problem right away. )10t seem unreasonable to consider wasn't far wrong. The customer explain- On this basis the customer suggested npplyjng 240 volts AC to it, at least ed that it was a combined needle holder that he might call back later after on an intermittent basis. Even without and scissors or. as nearly as I could attending to some other business. any iron core, there should still be gather, the surgical equivalent of a pair After he left I went back into the enough inductance and resistance to of combination long-nose pliers and side workshop and, armed with a couple of keep the current within safe limits, cutters. . . pins from the stationery drawer, made a 1 rigged up a power cord from a I gathered that, in the insertion of rough check on the degree of magnetism length of flex and a three pin plug stitches into a wound, it is customary ' to employ a curved needle, which is ^ _ m a m* a% a* aa ma ■ m am a* va* > ■ am ■ a am am a gripped by the needle holder and in- CHOOSE THE BEST— IT COSTS NO MORE serted with a rotary action, so that the vCHOOSEf THE BEST-ITtrJL " COSTS NO"V MOREinwitu point of the needle emerges from the other side of the wound. It is then gripped by the needle holder again and withdrawn completely, bringing the threal with it. At this point the thread has to be tied and the needle cut from it. The needle holder is then used to pick up RESIN CORE SOLDERS another needle and thread and the pro- for reliable connections cess is repeated. It wasn't hard to understand how the combination had been evolved. Using separate needle holder and scissors, it o.0. T. IEMPRIERE & CO. IIMITED.LIMITED. Head Office:Office; 27-41 Bowden Street, Alexandria, N.S.W. would be necessary to pick up and put and at Melbourne • Brisbane ♦• Adelaide • Perth aside these items many times in the 1 Radio, Television & Hobbies, June, 1964 37 Mullard

Heatsinks for

Diodes, Transistors

and SCRs

• High Efficiency • Robust Construction • Reliable Rectification

Mullard three-phase bridge reclilier assembly using silicon power diodes mounted on three heatsinks.

07 95 High efficiency, robust construction, reliable ?5I rectification—these are the factors gaining ready acceptance for the Mullard rectifier stack assemblies. Much of the efficiency is due to the extruded 5071 aluminium heatsinks used in these assemblies with their low thermal resistance i.i - enabling high power ratings to be economic- 3751 ally achieved. The performance and efficiency of other control equipment utilising SCRs or tran- 1 sistors depend not only on the characteristics of the semiconductors but on the 58 thermal properties of the heatsinks used. Mullard, therefore, now have available from local production the heatsink material shown, which may be obtained in standard , lengths. Further particulars may be obtained on application to the Mullard Professional and Industrial Department. Dimensions in mm. Inch conversions in brockets

MULLARD-AUSTRALIA PTY. LTD. • 35-43 CLARENCE STREET, SYDNEY, N.S.W.. 29 2005. 123 VICTORIA PARADE, COLHNGWOOD, N.5, VIC., 41 6644 Mullard Associated with MULLARD LIMITED. LONDON M129

38 Radio, Televition & Hobbies, June, 1964 and soldered the two wires to the field their coming in contact with the per- might be able to put myself "on-side" coil terminals. I was just in the process manent magnet on the speaker. Alter- with Mrs Serviceman. For months she of applying some tape to the bare natively, one may sometimes do this has been complaining that her dressmak- terminals — after all, safety is impor- deliberately, so that a screwdriver may ing scissors have become magnetised, and tant, even on a short term basis — be used to fish out small steel objects are invariablv fouled up with pins every when in walked the customer. from those inaccessible places in which time she picks them up. "Any luck?" he enquired, as I beckon- they choose to hide. However, one word of warning. While ed him into the workshop. Unfortunately, once magnetised they such a set-up may be ideal for surgical "You're just in time for a trial run," normally stay that way, and become a instruments, pliers and similar objects, I replied. "If the thing doesn't go up in source of possible annoyance and irritat- don't be tempted to use it on a watch flames, we should be in business." ion in one's everyday work. Invariably, if you suspect that it needs demagnetis- And, since there didn't seem to be when one needs them in a hurry, to ing. A field as strong as this would any reason tq put things off any longer, reach into some confined space when probably twist the hairspring into half only one hand is available, they present a dozen "figure eights." I plugged the lead into the power and themselves clinging lovingly to an as-, switched on. Nothing happened. There sortment of nails, screws, and other fer- was no smoke or sparks or other signs rous objects which one has been im- of distress and I reasoned that either I prudent enough to leave lying on the had judged matters quite nicely, or the bench. FREE coil had gone open circuit at the first The trouble is, one usually has to application of voltage. bring the other hand into play—the one Catalogue of that is holding something vital which has DOUBTS VANISHED taken ten minutes to get into position— RADIO & ELECTRICAL COMPONENTS I picked up the needle holder and in order to pull them clear. Either that, Both new and second hand com- pushed the business end into the centre or one must shake them loose so of the coil. Any doubts about the con- ■vigorously that there is a good chance ponents, Government surplus. tinuity of the coil vanished as I did so, that one will never find them again; a Send stamped self-addressed because the AC field could be felt quite risky business if they happen to be vital envelope to: strongly as a very definite vibration. parts which may not easily be replaced. Having thus satisfied myself that the All of which is a very good reason BARGAIN STORE device was working, I slowly withdrew Ifor having available some ready means 42 HIGH STREET, the instrument from the coil. This slow iof demagnetising these things when withdrawal of the object from the AC inecessary. And while I'm about it, I KAIAPOI, N.Z. field — or slow reduction of the - field strength, where this is practical— is an essential requirement for the complete removal of the magnetic effect. Too rapid a reduction in field strength Be Paid What You W% may result in some magnetism being retained. To test the effectiveness of the experiment, I applied the pin test again. are REALLY WORTH liZ However, I was careful not to use one Develop your aptitudes at your own pace, for recognition that brings of the pins I had used for the previous HIGHER PAY. Begin YOUR Progress Today! Select the course tests, since they were almost certainly you want and which will benefit you most. ICS will send YOU magnetised themselves as a result of it. promptly — a FREE illustrated BOOK, giving FULL DETAILS. So I selected a fresh one which, 1 hoped, was magnetically uncontaminated. GENERAL Retail Managamant Auto Mechanics Journalism — Short Storiot Commercial Managam't Civil Engineer The test was somewhat inconclusive. Writing for Radio & TV Small Business Owners Production Managam't While there was no doubt that most of Intarior Dacorating Hotal-Motal Managamant Industrial Managamant Etiquatta & Entartalning CKib Administration Executive Training the original magnetism had been destroy- Taitilai Window Dressing Modern Supervision ed, there was still a very slight tendency Photography Business Letters SPECIAL EXAMINATION for the needle to be attracted to the Mathemafict BUILDING COACHING COURSES instrument. Had my improvised set-up Ganaral Education Archrecture Account'cy; All Exams Drattmalung Building Contracting Institute of Sacratarias failed to remove the last vestige, or was DRAUGHTSMANSHIP Carpentry, Joinery Inst. Cost Accountants there a trace of magnetism in the pin? Architactural Structural Engineering Inst. Sales t Marketing. Buildan' Plan Drawing Concrete Engineering Metric, or Laav. Cart. Machanical Structural Estimate & Quantities Intarmadiate Cartificate BOTH TREATED Survaying & Mapping Roofing, Steel Square Senior or Junior Public I settled the argument by picking up ILLUSTRATING Timber Home Building C'waafth Clerical Exams the pin with the instrument and sub- Still Life — Landtcapa INDUSTRIAL Police Entrance Exam jecting both to the AC field treatment. Caricature & Cartoons All Mechanical Eng. Nurses' Entrance Exam Oil I Watar Colour. FiHing & Turning Steam Certificate Then I checked them again. There was Fashion Drawing Soft Drink Manufacture Refrigeration Certificate no doubt about it this time; there was Showcards & Tickats Air Conditioning Radio Examinations Signwriting Gas or Elect. Welding Inst. Auto. Mech. Engrs. not a vestige of magnetic attraction Chemistry, Plastics Inst. Diesel Engineers between the two. Clearly, there had been COMMERCIAL Electronics Shire Overseers' Exa-n some magnetism present in the pin. Accountancy Electrical Machanics Engineers' Institutions, Cost Accountancy Radio Eng. or Service ADVERTISING Naturally, the customer was highly Ganaral Bookkeeping Television Copywriting delighted. Not only was the job done, Salaimanihip Refrigeretion Commercial Art but he had seen it done and seen the Shorthand Typing Diesel Engines Advart'g Inst. Aust. result. There was no doubt in his mind that it was a perfect job and he could to INTERNATIONAL CORRESPONDENCE pass this confidence on to his customer. Dep.. 526 SCHOOLS, What was more, I think I could have SYDNEY: 400 P«ifie H'way Crow'. N.jt, Tele.: 43.2121 sold him my hastily improvised unit on MELBOURNE; 234 CoKiiti Street. Tele.; 63.7327 the spot, had I chosen to. As it is, I BRISIANE: A.M.P. Building, Edward Street. Tele.: 2.6125 have agreed to produce something simi- ADELAIDE; TAG Building, King Williem St. Tele.: W,4I48 lar for him, but very much more ro- PERTH: C'weelth Bank Building, 55 Williem St. Tele.; 21.7268 bust physically and—most important— NEW ZEALAND: Wellington, 182 Wekefield St.Tele.: 53.109 with a greater safety factor. From this first test I imagine a lower voltage, from Please send Free Book on a transformer, may still be adequate. NAME (Mr, Mrs, Mist) AGE While I am about it, I may knock up one for myself. It is quite common for pliers, sidecutters, screwdrivers etc., STATE Dept. 524 used on radio and TV sets to become OCCUPATION PHONE magnetised accidently due mainly to Radio, Television & Hobbies, June, 1964 E A K rrr.

l/S Jb^JL iX/ JLouo«- JUstsO

/iiLOJU^voul} ou^cL yjpX' iX AO I JJtiAxrtdl XiLojfe.

This is the amplifier Australian audio enthusiasts hare been waiting wmmm for! The LEAK Fully Transistorised Stereo Amplifier was introduced at the Audio Fair in London only in April; the first shipments are on their way to Australia. LFAK pioneered high fidelity amplifiers Reprinted from "WIRELESS —the famous Point One LEAK amplifier earned a place in audio WORLD" Editorial. May. 1963: history, for it was the first commerciaily manufactured amplifier in ". . . Last autumn, during his preii- the world with the extremely low distortion rate of . 1 per cent! With dential address to the British Sound the advent of transistorised amplifiers, it is natural, then, to expect Recording Association, H. J. Leak LEAK to lead the world. This is the extra satisfaction LFAK will demonstrated a prototype high- bring to you . . . pride in owning the world's best amplifier! quality transistor amplitier which gave results indistinguishable from SPECIFICATIONS: those of his valve amplifiers . . INPUT: Five-position switch allows you to select PICKUP (mono or stereo), TAPE HEAD "People sometimes ask why ihere is (mono or stereo), TUNER (mono or stereo), TAPE AMP (mono or stereo) and MICRO- any necessity to change to transis- PHONE (mono or stereo). PICKUP; Sensitivity, 3.5 mV at 47k ohms, or 20 mV at 33k tors. The elimination of the output ohms, or 60 mV at 100k ohms (mono or stereo). RIAA characteristic. Response; plus or minus I dB 30 c/s to 20 kc/s. TAPE HEAD; Sensitivity 3mV at 47k ohms. Characteristic: transformer is, in our view, sufficient European, NARTB, CCIR, NARTB 7V2 i-P-S. Response extends from 40 cs to 15 kc/s. reason now that solutions of the TUNER: Sensitivity 100 mV at 100k ohms or 500 mV at 50k ohms. Response, plus or minus problemr of linearity in the response IdB 30 c/s to 20 kc/s. TAPE AMP—Sensitivity; 125 mV at 50k ohms, or 250 mV at 100k of the est of the t'-ansistor circuit ohms. Can be used for the output from equalised tape reproducers, Radio tuners, TV have been ^ound. As additional receivers or any other "flat" input. Response: plus or minus IdB 30 c/s to 20 kc/$. bonuses we get smaller size, cooler MICROPHONE—-Mono or stereo. Sensitivity: 3 mV at 33k ohms or I2S mV at 150k ohms. running and the prospect of longer TRANSISTORS; 2-AC 107. 4-GET 113. 2-OC44. 2-AF 118. 2-GET 53B. 2-AC I27Z. 4-AD 140. life."' FUNCTION. (I) Mono-parallels the L and R circuits, enabling a stereo pu to play monaural LP records. (2) Stereo. (3) Input R—connects both channels to R input. (4) Input L—connects both channels to the L input. BASS: Continuously variable, plus or minus 16 dB at 50 c/s. TREBLE: Continuously variable, plus or minus 16 dB at 14 kc/s. FILTER AND SLOPE: When used with the treble control you have an enormous range of high frequency attenuation. Turnover frequencies: 4 kc/s. 6 kc/s and 9 kc/s. VOLUME ON/OFF: AC switch and ganged control. BALANCE; Either channel may be faded to zero. PRICE: Less than comparable Leak Valve amplifier. INTERSTATE REPRESENTATIVES: NEW SOUTH WALES; Audio Enginaars Pty. World wide demond for Hie LEAK Stereo 30 hoi Ltd., 422 Kant Straat, Sydnay. been so great that deliveries cannot be effected Tal.: 29-6731, SOUTH AUSTRALIA; Edco Salat, 233 immediately. Order yours now at your favourite Rundla Straat, Adalalda Tal,; 8-1259. audio store . . . the LEAK Stereo 30 is well QUEENSLAND: Sydnay G. Hughes, 154-156 worth the slight delivery delayl Arthur St., New Farm, Brisbane. Tel.: 58-1014. WESTERN AUSTRALIA; Athol M. Hill. 842 Hay Street, Perth Tel.; 21-7861. Australian Natiinml Distributors for these Jumous products: TASMANIA: K. W. McCulIoch Pty. Ltd.. 109 York Street, Launcaston. Tel.; 2-5322. A.C.T. Australian Physical Laboratories, P.O. Box 225, Canberra City. Tel.: 4-3010 (Mr J. E. Howe). 128 Elizabeth Street, Melbourne, Victoria. Tel. 63-82U. 63-8166. Sydney Office: N.R.M.A. House, 26 Rldxe Street* North Sydney. Tel.: 92-3890.

40 Radio, Television A Hobbies, June. 1964 For Our Beginners ...

A VERSATILE

TWO VALVE

MANTEL RADIO Although cheap materials and simple Here is a design for a mantel set which should appeal particularly to construction are used for the cabinet the beginner. It is simple enough for him to tackle without fear, yet this picture shows the neat and has a performance which will allow it to take its place in the kitchen, artistic result. bedroom, etc., as a conventional "second set." It also offers a number of features which make it an unusually versatile unit for the experimenter. former enabling a higher voltage to be developed across the secondary winding By Keith Woodward than would be possible with a diode detector. IN these days of mass production, it is Another most valuable feature of the Owing to the low damping of the an unfortunate truth that it is very sset, and one which may well be sufficient secondary winding, we automatically difficult for the home constructor to pro- "in itself to justify building it, is that it achieve better selectivity than might oe duce a mantel radio as cheap as one 'can tune down to the University of expected, but not sufficient to separate bought over the counter. Nevertheless, fN.S.W. broadcasts on 1750 Kc. This is all stations in some areas. If you are many readers—particularly beginners— aachieved by simply adjusting the trimmer favoured with only one or two local have a yen to build such sets, mainly for acrossa the tuning capacitor to give the stations in a country location it should the satisfaction and experience it eextra coverage, possibly at the cost of be possible to bypass the pentode cath- provides. ssome slight loss of dial calibration ode to chassis with a .1 mfd 25 VW aaround 2CH, 2SM. capacitor and sit back and enjoy the It is to help satisfy this demand that The audio section of the receiver uses entertainment provided. However, less we have designed this set. We have tried ' - ■ . __L—— to make it as simple and economical as a 6GW8 triode pentode, in a configura- possible but, even so, the builder may ^tion similar to our latest AC portable stereo player. An output of 2 watts may I MIN1TEST 2 have to consider it mainly as a learning .be obtained from this amplifier which is project with the cost written off as the ^enough for all normal domestic require- (Trantitloriiedl -ap price of knowledge. ®ments. A conventional top-cut tone con- However, to provide the best value for ttrol is fitted. >r the cost of parts and outlay of time, it TV, VHF & UHF |dM was decided to make the set as versatile yALTERNATIVE TUNERS Technicians as possible. It really consists of two Quick method of l^K' units; a simple but effective tuner using The tuner portion can be made in either one of two forms: with a limited signal tracing in: I^Bi an RF amplifier, infinite impedance de- ®amount of fixed regeneration, selected to tector, and regeneration; a high quality suit the locality, or with variable regen- audio amplifier using the 6GW8 valve in ®eration as a panel control for those who a well tried circuit. ®wish to get the last microvolt of sensi- ir Video Stages w 1tivity out of it. MANY APPLICATIONS * * SWP fl The two units are normally coupled Several circuits were tried and discarded, before we were satisfied with the if All Tuners together to form a complete receiver, but performance of the tuner. Even so, we ■ phone jacks make possible a number of ^do not advise the use of this set in close variations on this arrangement. One is proximity to a broadcast station unless if Can be useful as a ■ fitted to the input of the audio amplifier, *you are willing to sacrifice the conven- Bar Pattern Generator. t so that it may accept the output from a ?ience of fixed regeneration for the more pickup; a second is fitted to the speaker exacting. adjustable variety. The final Frequency: 250KC- network so that a better quality speaker circuit uses a twin valve type 6AN8A. 500 MC Harm. f may be plugged in, if available. Such a The pentode section is used as an un- combination would constitute a good t Output: 8 V P-P, | quality mono record player. tuned RF amplifier, the plate feeding into A third jack is fitted to the output of 'a standard RF broadcast coil primary. Input: 500V. j the tuner. This permits signals from the When wiring this coil into circuit, be tuner to be "picked out" before they ssure to follow the manufacturer's pin She: OD.0A3" x reach the amplifier and diverted to 1markings and do not reverse either of 5.12" t another amplifier, tape recorder, etc. The 1the windings. The cathode of the pen- (ballpoint pen] j jacks are wired so that, when connection 'thode is not bypassed, the reason for is made to them, they automatically dis- vwhich will be apparent later. The RF Weight: 0.9 ox. incl. ■ connect the unwanted section of the set. 'coil is tuned by a single gang capacitor battery. ^ Simple though it is, the set can give !and feeds into the triode section of the a good account of itself. The prototype 1valve, which is wired as an infinite im- Price £7/7/- was tested in a number of suburban 1pedance detector. inciudtt Salet Tax. Poifage localities with good results. In an inner- With an infinite impedance detector, axtra 3/-. suburban flat, for example, we were able inegative current feedback across the to receive all the Sydney broadcast stat- 1high value cathode resistor reduces audio Phone (evenings) 68-3908 at ions at good level, as well as two stations

ADCOLA PRODUCTS PTY. LTD., 673 WHITEHORSE. ROAD, MONT ALBERT, MELBOURNE, VICTORIA, TELEPHONE 884351

| N S W GEORGE BROWN & CO PTY LTD. ?9 5877 ELECTRONIC PARTS PTY LID 56 0-125.

GENERAL ACCESSORIES PTY. LTD. 73 0211. GEORGE KENT (AUSTRALIA) PTY LTD 67 0361. L_ KERR BROTHERS PTY. LTD. 28 1474, MARTIN OE LAUNAY PTY. LTD, 29 5834.

LAWRENCE & HANSON ELECTRICAL PTY. LTD 69 4041. NEWCASTLE 01 5573, WAGGA 4224.

PAUL'S (MERCHANTS) PTY. LTD. 61 6392 RADIO DESPATCH SERVICE 61 1876. REG. RGSE & CO PTY. LTD 29 1861. W G WATSON & CO, PTY. LTD. 29 5631 NEWCASTLE 61 4961

VIC. ELECTRONIC DEVELOPMENTS PTY, LTD. 63 3596. GENERAL ACCESSORIES PTY. LTD 69 0300. c:

HOMECRAFTS PTY. LTD 32 3711 RADIO PARIS PIY. LTD 30 1251 r: WARBURTON F'RANKI INDUSTRIES iMELB.. PTY. LTD. 67 8351

|QLC. T. H. MARTIN PTY. LTD. 2 1785. BATTENS ElfCTRlCAL PTY LTD. 5 3036. SOUFUPORr 2 1635 [_

CHANDLERS PTY. LTD. 31 0351. 1AMES CROKER 8 SONS. MACKAY. A E HARRQLD PTY LTD. 31 3081 [_ LAWRENCE & HANSON ELECTRICAL (QUEENSLAND: LTD 2 1151 CAIRNS 3739. TOOWOOMRA. T'VILIE GENERAL ACCESSORIES PTY. LTD. 2 3093 B. MARTIN PTY LID. CAIRNS INNISFAIL. [~

C. A. PEARCE 8 CO. PTY, LTD. 2 3201 TRACK SON BROTHERS PTY LTD 2 2804 WYPER BROTHERS LTD, V 32P BUNDABERO. [~ S.A f, R. MAYFIELD LTD. 8 4131 GENERAL ACCESSORIES PTY. LTD. 23 4022. T V. CENTRE LTD 65 7651. [~

| FAS CHARLES DAVIS (WHOLESALE; PTY, LTD HOBART 3 3121. W 8 0 GENDERS PTY, LTD. LAUN. ? 2231 Q HOMECRAFTS-TASMANIA HOBART 2 2711. LAWRENCE 8 HANSON ELECIRICAl PTY LTD. HOBART 2 7464. LAUN 2 2683 Q

Iw.A C L. SEOUNARY 8 CO. 21 660/ CARLYl.E & CO. 1959. PTY. LID 21 9:31 GENERAL ACCESSORIES PTY. HD 21 2501. ! N.T. LAWRENCE 8 HANSON El ECTRfCAL N T PT"^. LTD. DARvVIN 3727.

42 Radio, Television & Hobbies, June, 1964 TUNER I AUDIO OUTPUT INPUT ijlj i

2xBY100 1

alternative feedback SIMPLE MANTLE SET SYSTEM

The choice oi feedback eapaeiioi between the cathodes of the 6AN8A is discussed in the text. The alternative circuit for variable feedback is also shown above. Should the plug-in facilities not be required the coupling capacitor may go direct to the volume control. fortunate readers must take further tion purposes. This RF, when coupled strength of the stations at the receiving measures to achieve separation of local into the cathode of the pentode amplifier, location. We adopted a second approach broadcast stations. is in the correct phase to give quite to the problem which the reader may Initially, we envisaged this set without smooth regeneration. This is the reason t(> incorporate. By removing the an adjustable regeneration control, but for the un-bypassed cathode resistor used tone control and moving the volume using a simple feedback system which in the pentode amplifier. If this point control to this vacailt p0siti0n we leave can be adjusted once and then left For was bypassed to chassts, no regeneration regeneration control. Smooth this reason the regeneration should not would take place. . 6 . vary a great deal from one end of the The capacitor used for feedback pur- regeneration can be achieved by insert- tuning range to the other. The best poses is clritical and will depend on the ing a variable resistor in series with the compromise was found to be the one size of the aerial used and the sigrial feedback capacitor. Adjustment of both shown in our circuit ■ diagram. With an infinite impedance de- ~~~ ~~~ tector there is a certain amount of RF at the ^ // \\ volume cathode, the exact vyi If yp. 'Tn if « control quantity depending on (fjl SWITCHSWITCH' > j// 3 • U )) the value of the cathode i i nfe- Ya bypass capacitor. _ I J I /— 1 =_ The value of capaci- / / / / |J \.Jf T y tor used at this point 11 1 yK TO TUNING was kept slightly smal- // power v' . \ S?r0 ler than normal for transformer m \f \ ri , capacitor two reasons. The first 11 , \ 1' Vv « . —. fl- was to minimise high PCPOWERjCXEncc '' 11 \ I T fP L-iLJ CJ frequency attenuation , DIODES 11 \ I. xip iok I rry of audio signals, the ^ | 'T'-a ' I es-l iso I cj \ -T——L i i Z4 second to provide a /lil '— /IT 1! lUi. ..—1 \ / —' TT" \ ~ source of RF which /ctd (—n/^ f, ^1——A. ^"1 01 might be fed back into /p>—T !l rNk «^L^r7?npr, the circuit for regenera- j / Vy '1 fe-l saool cji S 11

2 * 50pF SPEAKER TRANSFORMER IS 350VW The wiring diagram A ^ ) shows the connec- JJ ^A^HTR m Hons for fixed re- t ' ^ generation. When 1 i SECv 1 AERIAL using variable re- \ 'v INAL the volume control \/\ \ and on-off switch \,\ \ TO SPEAKER will occupy the posi- \_\_ \ tion originally taken Kj)) \ by the tone control. —^ ' This will then place MAINS CORD the regeneration eon- EXT.E) SPEAKER AUDIO INPUT TUNER OUTPUT trol in the space vacated by the volume control. ■ Radio, Television & Hobbies, June, 1964 MaCRRTHS

VICTORIAN DISTRIBUTORS...

KIT SPECIALS "Milliard" 44 stereo Amplifier kit set This circuit has been designed for This monlh we've again assembled K.il Sets of the most popular stereo or mono , . . and Kit has "Playmaster" Amplifier and Tuner circuits (Magrath Kits include fully illustrated assembly instructions, too. Magrath "Mullard" Kit price, everything), also the two popular "Mullard" Amplifier Kits. £29.

"Playmaster" No. 106 "Playmaster" No. 4 Amplifier - Tuner kit set Amplifier kit set Basically a combination of the "Play- This amplifier gives greater power master" Unit No. 4 Amplifier and output (18-20 watts) . . . this makes >ec>j Program Source Tuner No. 2. Com- this unit highly suitable for the latest plete Kit of Parts. Price £49/10/. ceramic and crystal, high and low pick-ups. Price of Kit Set, £34, 17/6.

"Playmaster" No. 3 "Mullard" stereo 10-10 Amplifier kit set Amplifier kit set This is the circuit as featured "R., TV and H.," January, 1962 . . . Kit comes with 7 printed wiring Power output 3.5 watts per channel, boards ... 2. 6GW8/E-CL86 valves sensitivity: 220 mv.. Feedback: 14 and one low noise AF pentode type d.b.. Frequency Response 18 cps to EF86 in each channel. Price of Kit, 15 KC at 3 d.b. Price £27/17/6. £47/7/6. "Playmaster" 107 "Playmaster" No. 2 Amplifier & Tuner kif Tuner kit set The latest edition to the "Play- master" range at Magraths . . . the This unit (as illustrated at left) will "107" Kit Set is a single ended amp- operate off any "Playmaster" ampli- lifier, incorporating a tuner (unit feat- fier, and is also available with inbuilt circd "R, TV and H.," March, 1964). power supply. Price of Kit, £45. We've a few Kit Sets of the famous "Playmaster" No. I Program Source Tuner . . . these Kits have all the parts supplied . . . ready for assembling (Do it Yourself and Save). * Please Note ... all of the Kit Sets on this page are available fully wired and tested . . . prices on application.

CABINET KITS Winter is always a good time for "Hobby Work," particularly as most of your time during the next few months will be spent indoors . . . Why not build that Cabinet now . . . with an 1N- STROL CABINET KIT from the MAGRATH Range]

iitei ....liMCT:*!.' E. if * Easy to assemble

* Save £s£s£s (A) No. 400 Inst. Cabinet Kit Price £13/16/. (B) Sin Speaker Enclosure Kit Price £7/18/. (C) lOin and 12in Speaker Enclosure Kits £10/15/. (D) No. 200 Instrument Cabinet Kit Price £19/18/. (E) No. 100 Instrument Cabinet Kit Price £16, (Also available as No. 600 Kit . . .. which provides for a larger turntable.)

J. H. MAGRATH & CO. R T Y. LTD. 208 LT lONSOAtl STRUT, MflBOURNf, VICTORIA, PHON1 TB 37 3 1 44 Radio, Television & Hobbles, June, 1964 feedback arrangements is discussed fur- physical size and the reduction in the broadcast stations, neglecting for the ther on in the text. transformer requirements. moment interstation interference. This When discarding the tone control it The actual construction should not aerial should be the shortest that will is necessary to fit a 1-megohm resistor present any great difficulties, and a good allow the conditions specified above. If from the 10K grid stopper resistor to idea of the layout can be obtained from no interstation interference is notice- chassis. This completes the 6GW8 pen- the photographs. In any case, it is not able, then bypass the pentode cathode tode grid circuit, but leaves the set particularly critical. For a chassis as resistor with a .1 mfd 25 VW capaci- without any form of top cut control. simple as this, most readers will probably tor. In most city locations interstation While seldom necessary for radio listen- be happy to make their own. interference will be present. If so, ing, it may be desirable for record Note that we had to add an extension select the smallest value of capacitor playing, and the reader will have to shaft to the miniature tuning capaci- for the feedback system which wiil give make up his mind what kind of a com- tor, in order to accommodate the type adequate station separation. Too hieh a promise he wishes to make. Shunting of cabinet and dial we had in mind. If value of capacitor will produce shrill the grid resistor with a .001 mfd capa- a thinner front panel is envisaged, either whistles when tuning over stations. The citor would be a simple approach to with or without a cabinet, this exten- value will vary between 150 pfd and the problem. sion may not be necessary. 680 pfd. To asist in the adjustment of Alternatively, if it is felt that the Four prefabricated terminal strips are the fixed feedback system the capacitor variable top control is essential, it used in the construction, reducing the may be possible to retain it by fitting a wiring of the unit considerably. If the suitable dual pot, thus providing an wiring diagram is followed carefully, the If you wont extra control without seriously upsetting reader should be able to hear the results the appearance of the cabinet layout. immediately power is applied to the set. It may be noted that there is a 3.3 There are virtually no alignment prob- pfd capacitor connected between the lems with this design as all that is neces- STEREO plate and grid terminals of the RF coil. sary is to track the tuning capacitor with The purpose of this capacitor is to give the calibrated dial. a more constant sensitivity over the com- First, ascertain that the dial is mech- plete range of the receiver. Without this anically aligned with the tuning capaci- EQUIPMENT capacitor the gain of the receiver would tor when fully in and out of mesh. All You'll deal befferwifh H.B. RADIO PRODUCTS Cabinets for equipment and speakers AT FACTORY PRICES are available from stock or we'll make to your order. You will find our value terrific on Amplifiers—Stereo, radio chassis— players—speakers—tape decksi. JUNE SPECIALS

MAGNAVOX 8WR speaker (f.c. 30-15,000 c.p.s, voice coil 2.7 or 15 ohms) and 1.9 cubic feet reflex cabinet. £t4/10/-. WHARFEDALE GOLDEN 10 or Goodmans Twinaxiom 10 speaker and 3 cubic feet reflex cabinet. £28/10/-, including In tbh underchattit view the trimmer dote to the centre it used as a line packing. control on the regeneration capacitor. The aerial terminal on the finished Cabinets are made of Jin ply to model was shifted to the top of the chassis. speaker mfrs. design. AH colours. First-class lacquer finish. fall by an appreciable amount at the that is necessary now is to adjust the "Make-II-Yourseir* cabinet kits high frequency end of its range. slug in the coil to make the dial read to suit all speakers, from £5 for Measurements taken with the proto- correctly at the low frequency end and 8ln. type, by feeding a signal into the aerial the trimmer to correct the high Stereo Amplifier, 8 watts, with terminal and varying the modulating frequency readings. It will probably be two 8WR speakers and Monarch or frequency, showed that it is possible to necessary to go over these adjustments Garrard stereo-monaural changer- achieve a response flat within 3 db to two or three times to get perfect track- player, £34. approximately 10 Kc. This was with ing. It may be necessary to remove the Stereo Amplifier. 10 watts, separ- minimum regeneration, and it should chassis from the cabinet when making ate treble and bass, two 8WR not be imagined that this order of band- these adjustments. speakers and Dual 1007A Stereo- pass could be used, other than in the To avoid this inconvenience, we sug- monaural player. £49/16/-. most favourable situation. gest two minor modifications if the set 8 Element TV Aerials. Highly is to be mounted in a cabinet. One is efficient and designed for weak sig- In most cases, adjacent station internal areas, for receiving stations as ference would almost certainly result, to replace the simple compression trim- follows. All capital cities, £5/5/-; particularly at night when interstate mer with a Philips concentric type, Ballarat, Goulburn, Valley, Can- stations are normally strong enough to mounted horizontally and facing the berra, Rockhampton, Townsville, produce severe "monkey chatter" and rear of the cabinet. This allows it to £5/15/; Darling Downs and N.E. lOKc whistles. However, in isolated adjusted with a suitable aligning tool Tasmania, £5; Central Tablelands cases, as when close to one or two while the chassis is in the cabinet. (N.S.W.) and Bendigo. £6/15/-; transmitters, individual readers may be The other is to drill a small hole in the Latrobe Valley, £4/10/-. able to get very good results from this bottom of the cabinet, so placed that a hi auimu simple tuner. lining tool may be passed through it to The speaker built into the set is a 4in engage the adjustable core in the RF Write tor Stereo Catalogue 15 ohm type. It may not do justice to coil. the amplifier but nevertheless is quite The only major adjustment is the H.B. RADIO PRODUCTS pleasant to listen to. The power supply initial selection of the feedback capaci- Manufacturers of Quality Radio used is the simplest possible consistent tor. This component may vary consid- and Radio Furniture for 33 years. with good results and the silicon diodes erably in value and is best selected by should have a very long life compared trial and error. The procedure is to initi- 103-105 Catherine Street, with a valve rectifier. An added advan- ally select the length of aerial, with no LEICHHARDT, SYDNEY. tage is the space saving achieved by the feedback capacitor fitted, which will give Telephone: LM5580. use of these diodes both in their own reasonable listening strength on local Radio, Television & Hobbies, June, 1964 YAMABISHI VARIABLE AUTO TRANSFORMER

An example of fine engineering is the Yamabishi Volt Slider, which is designed for any application where a continuously variable voltage is required for experimental or test purposes, or for permanent operation. The Volt Slider is an infinitely variable hand-operated Auto-transformer. Test results at different loads show that output voltage is very consistent with that registered by the scale over the full voltage range. Ease of selection is also ensured by the wide range of models available. Those normally stocked are suitable for 240 volt 50 cycle supply voltage, and variable from zero to 260 volt, with current rating 1 to 60 amps. Other input voltages and output ranges are available to order over a wide variety of special types, 10 amp 3 phase portable including oil filled and dual output models.

BENCH OR FLUSH SURFACE MOUNTING SWITCHBOARD TYPE MOUNTING 1 amp £7.17.0 £8.10 0 2 amps £10 10.0 Ell. 9,0 5 amps £16. 3.0 £18.12,0 10 amps £25. 0.0 £28.12.0 20 amps £62.10.0 £71.10.0 5 amp single phase portable Pri ccs plus 12.\°/a S/T nhcrc iipplicnbli'. VOLT SLIDERS IN STOCK PRODUCE AN OUTPUT VOLTAGE BETWEEN 0 AND 260 VOLTS WITH A 240 VOLT SO CYCLE INPUT Sole Austntlmn Ag«nfi —

ROWE & CO. PTY. LTD. MELBOURNE • SYDNEY • BRISBANE • ADELAIDE • PERTH • H0BART 10 amp single phase portable

0*^ R.C.S. C LOWfWtt1 ( & COMPLETE Quu/ry pQ || CONSTftUC/fOf// 30 WATT Y0URSCLF 12v. All Transistor PERSONAL P.A. AMPLIFIER No. 597—consisting cabinet, chassis, KITS TRANSISTOR RADIO front panel and hardware £S/4/. I Translitor, I Diod«. No. 598—Complete Kit of parts, to • First time in Australia • It's fun, it's guaran- No. 582—Do-It-YOURSELF Kit of Part* smallest screw. £27. No. 656—Wired teed to save £s • Build any of these in one even- for abov®, 49/6. ready to operate, £29/10/. Postage No. 593—Wir®d ready to operat®. 59/6. 597, 598 and 656, 10/ each. ing • Compactly designed, fully engineered Postage 582 , 593 I/. No C.O.D.i. • Comparable to the finest commercial sets TRANSISTOR COILS • Beautiful cabinet, high impact plastic • Every- thing included, even the smallest screw • Stan- AND IP'S dardisation — cabinet and parts interchangeable mm Pert No. • Minimum of tools required • New simple 174 Single Tuned IF 455 Kc 16/- adjustment technique • No technical knowledge 175 Single Tuned IF 455 Kc 16/- • No expensive test equipment • Everything fits. 176 Double Tuned IF 455 Kc 17/- Transistor 3 Complete Kit No. 644 £11 0 0 177 Double Tuned IF 455 Kc 17/- Transporta 4. Complete Kit No. 646 £15 IS 0 Transporta 6. Complete Kit No. 650 £20 0 0 * 178 Double Tuned IF 445 Kc 17/- Super RF Transporta 7. Complete Kit No. 640 £21 IS 0 179 Trentporfe IF 17/- Super RF Transporta 7. Basic Kit No. 641 £13 0 0 248 Osc. Coil 15/- Super 7 Portable-Car Radio Identical to 640. Extra switch and car aerial coil. Complete 249C Aerial Coil with rod £1 Kit No. 642 . .. .._ . . £23 0 0 CAR RADIO 252 RF Coil 16/- BASIC KIT CONSISTS OF: Necessary coils, I.F.'s, Printed No. 655—Batic Kit, consists cabinet, 253 Car Aerial Coil 17/- Circuit, Cabinet, Dial, Knobs and hardware. dial, 6 coils, choke, hardware and 221 Aer Coil Valve 17/- Postage 7/6. Battery 10/ extra. printed circuit. £ 12/15/. lNEW BATTERYl SAVERl KIT No, 654. Complete Kit of parts, to 223 Otc. Coil Valve 15/- i or 9v. She 3 /j"L « 2 /j"W i l /j"H. Replaces battery smallest screw. £26/10/. 118 IF Var. Freq. 445 Kc 18/- in your transistor radio. Operates from the power. Part Postage on 654 and 655. 10/. No. 457, Post I/. £2/19/ 119 Standard IF valve 445 Kc Part No. Sales Tax Included 17/ 624 PADDERLESS GANG COIL KIT £2 II C Radio 49 Padderless 3 gang £ I 13 C OROER BY MAIL 255 Ferrlte rod aerial £ I 0 C CHEQUE, POSTAL NOTE Ply. Ltd. 256 Std. aer. coil 17/- OR MONEY ORDER DIRECT R.C.S. 257 R.F, coil 16/- TO R.C.S. (add postage) 651 FOREST RD., BEXIEY, N.S.W. - IW3491, LWS385 258 Osc. coll 15/- 46 Radio, Television & Hobbies, June, 1964 may well be made up of a fixed and var- pins into the top and bottom edges of iable capacitor in parallel. each side. These should be about an NEW 1964 When using variable feedback control inch in from the front and back edges increase the value of the feedback cap- and in the centre. HI-FI GUIDE acitor till this heterohodyne whistle is The panel pins should just protrude evident. This value is then wired in series from the other side of the wood. Now with a 2000-ohm (or thereabouts) carbon spread a good quality wood glue along potentiometer, which will allow the de- the surfaces to be joined and, after gree of feedback to be easily adjusted. carefully aligning the pieces, nail them For the constructor who does not wish together. We used a plastic glue (Aquad- to construct a cabinet for this set an here) for this application and also when illustration is given of the speaker moun- fixing the speaker fabric. After nailing ted directly to the chassis. It would only the four pieces together use a square be necessary to fit a metal, or wooden to correct any lean on the cabinet and front panel to take the dial. When using put it aside for the glue to set. (About this type of construction it is essential half an hour.) to have sides on the chassis to prevent accidental contact with wiring when Next cut a piece of the moving the set. contact adhesive material to approxi- For those wishing to give a finished mately 36in long by 7iin wide. Check appearance, we have constructed a cabi- this against the cabinet where it should KEITH WINSER'S NEW YEAR give about a 2in overlap when wrapped BOOK FOR BETTER LISTENING! net which should be well within the around the cabinet and a lin overlap scope for the home constructor. at front and back of the box. When the Now yon can know what records Materials used for the cabinet were 5/16 glue has dried on the cabinet square make a basic good library, how to in plywood, contact-adhesive fabric, and know what is high fidelity equipment speaker fabric. off any uneven edges and thoroughly clean all surfaces. Slight rounding of the on the Australian market, testing The cabinet is simply a box measuring, methods, a buyers" guide to all speak- inside, lOin wide, 5 5/8in high, and co. nets may be an advantage. Strip the backing off the adhesive material back ers, tape recorders, etc. and how to 5 l/8in deep. In regard to the last enjoy stereo, etc. 7/6 all news- dimension, take care to add to it the one or two inches and apply the material to the bottom of the cabinet, at the agents. Also ready is the 4th Edi- thickness of the front panel, since the tion, TV Year Book. 7/6. latter fits inside the box. For maximum middle, making sure that the material strength, the top and bottom pieces are is square with the cabinet. MOTOR MANUAL fitted inside the end sections, the latter It is now only necessary to pull the being cut longer than the 5 5/8in backing off for small distances at a 351 ELIZABETH ST MELBOURNE dimension by twice the thickness of the time and smooth the material onto the material. cabinet. If necessary this material may The covering of the cabinet was a be lifted and refitted if a mistake is plastic contact adhesive material made. At this point there will be an LAFAYETTE available in several designs from various overlap at the front and back of the manufacturers. We selected a walnut cabinet. The corners of the material will TRANSISTOR finish marketed under the trade name have to be cut to allow a neat fold of "D.C. Fix." to be made. We would suetest that you Having cut the four sides of the do the back edge of the cabinet first ANALYZER KIT cabinet, carefully smooth all the edges to get the idea of the edge cutting. with a file or fine rasp and sandpaper. After this practice a neat finish should Take the side pieces and rule a faint be obtained with the front edges. line 5/32in from the top and bottom The front panel is inserted from the edges. This gives the location for the front and is fixed to two cleats attached panel pins used to hold the cabinet to the inside ends of the cabinet. Two I V Is S ^ together. Now drive three llin panel pieces of plywood 21 in by lin are cut | IF J •» - • . J

MADE KT-223 IN U.S.A. 6-IH-1 VALUE £13/9/6 • IN-CIRCUIT AND OUT-OF- « » CIRCUIT TRANSISTOR CHECKER • DIODE AND RECTIFIER CHECKER • SIGNAL GENERATOR ay • BATTERY TESTER • VOLTMETER • MILLIAMETER Lafayclto's KT-223 Transistor Analyzer checks all types of transistors includinK power typos, also diodes and rectifiers. The in- circuit test couples the transistor to an oscillator circuit within the tester for an actual torperformance is checked check. for leakageExternally and betathe gaintransis- in 3 ranges up to 200. The KT-223 makes trouble shooting transistor radios easy by supplying a 5kc test signal with harmonics C Rh iy and AF vt1221 * circuits, checkingu . transistor features radio a voltmeterbatteries usefulup to for12 volts and current drain up to 80 ma. Complete with test leads and slep-by-stcp instructions to make building this kit a Pleasure. Attractive black case with anodized aluminium front panel <9 O 1AFAYETTE I I 1 ' ELECTRONICS Division of This view shows one method of mounting the speaker to the chassis should Electron Tube Distributors Pty. Ltd. no cabinet be required. With this mounting a thin metal Irani panel could 3A WELLrHGTOH STREET, be fitted to accommodate the dial. PRAHRAN, 5.1. VICTORIA Radio, Television & Hobbies, June, 1964 47 Imported Stereo. Crystal Australian Made English PICKUP ARMS PICKUP CARTRIDGES MONAURAL CRYSTAL Less Cartridge. C/W Sapphire Stvlus. PICKUP CARTRIDGES C/W L.P. and Std. Sapphire Stylii. 9/11 Plus Pack, and Post. 6d. 25/- Plus Pack, and Post. 6d. 19/11 Plus Pack, and Post. 6d. PROJECTION STYLOVUE NEEDLE RECORDING TAPE MICROSCOPES INSPECTORS Checks Needle Famous IRISH Brand American Tape, Shows magnified image of object on .tin 900ft . 25/ -Iin 1.200 ft 30/ ground glass screen. Tip without removing from Cartridge. Sfin 850ft 25/ Also well-known GRUNDIG Tape in plastic Cassette 19/11 Plus Pack, and Post. fid. 19/11 Plus Pack, and Post. 6d. 5 j in 1200' 35/

WARBURTON FRANKI

LINE FILTERS TOGGLE SWITCHES Microphones Dynamic 10 amp. size—2 required. Bulgin S270—D.P.D.T. 5/11 HI-IMPEDANCE C'W cable, plug and built-in stand. 55/ " pair plus Pack, and Post. 2/6 Bulgin S259—S.P.S.T. 4/11 Plus Pack, and Post. fid. 35/- Post free. CHOKES i Henry 300 m.a, INTERCOMMUNICATION MICROPHONES CRYSTAL 12/6 Plus Pack, and Post, !/. SETS 2-way radio, combined with Locally made C/Wstand adapter 3 TRANSISTOR master station—C/W connecting wire. and flex. MANTEL RADIOS £10/19/6 20/6 Post free. Good volume and tone, Plus Pack, and Post. 3/6. TRANSISTORISED £7/10/ "Plus Pack, and Post. 1/6 MICROPHONE MIXER CONDENSERS Fnahlcs 4 microphones to bo used I mm one input Separate volume eomroK tor each 6 TRANSISTOR Can type 200 m.f.d./400V peak. channel, Anraciivc metal box bin x 2*4in x POCKET RADIOS 2'tin. Connections h> standard phone plug. C/W earpiece and carrying bag. 10/- each. Plus Pack, and Post. fid. V volt battery supplied. £5/7/6 Incl. post. £9/19/6 RECORD PLAYERS POTENTIOMETERS Complete record players in attractive New 2 Watt Transistor plastic case — 3 speeds—works from Audio AMPLIFIERS 25K., 100K, 250K Ohms. 1 /- each self-contained batteries. Plays any Completely encapsulated in cpnxv resin. Work* record anywhere. from voltages of 4'/2 to 12. Output impc W/Switch—250K. 1 /6 each p us dance 3.2 to 45 ohms. Leallei supplied shows PO /10 / A ' Pack. how to use as I -Stereo. Amplifier. 2 Plus Pack, and Post. fid. to/ 17 / 0 and Post. 3/6. Stereo. Converter. 3 • • Intercom. 4 P.A. Sys- PILLOWPHONES 5—Signal Tracer. Listen to your transistor radio without 2 STATION TRANSISTOR £8/7/6 Post free. disturbing others. Intercommunication Sets 19/11 Plus Pack, and Post, fid, Ideal for use between house and garage, betwen outhouses, etc. • SPEAKERS EXTENSION SPEAKERS 99/6 Post free. EXTRA SPECIALS 9in in attractive circular housing. Ideal 12in 10 watt dual-conc speakers. Fre- for boats, terraces, etc. 15 ohm im- quency response. 30 to 15.000 c.p.s. Voice coil impedance either 2-4 ohms or 12-16 pedance. IMPORTED ohms. £5/! 9/6 Post free Victoria. 69/6 Plus Pack, and Post. 2/6. RECORDING TAPE Please add 3/6 Post, other States. 8in 7 watt dual cone sneakers. Fre- 3in 200ft 6/11 3in 300ft 10/6 quency * response—.10-15.000 c.p.s. Voice CAR AERIALS 3 in 400ft 16/11 5in 900fl 23/6 coil impedance 2-4 ohms or 12-16 ohms. Disappearing type cowl mounting — 7in 1.800ft 46/11 £5/9/6 Post free Victoria. good quality—C/W lead. Plus Pack, and Post, fid reel. Please add 2/6 Post, other States. Empty Spools: 3 in 4/6; 5m 6/6; 7in 2 SPEAKER SYSTEM 69/6 Plus Pack, and Post. 2/6. Comprising 12in woofer and 5in tweeter, 8/9. Plus Pack, and Post, fid each. c. w 2 m.f.d, coupling capacitor. Overall response 50-14.000 c.p.s. Power handling capacitor—15 waits, Voice .coil impedance—-15 ohms £8/19/6 Post free Victoria. MOVING SHORTLY to 220 PARK ST., Sfh. Melbourne Please add 4/6 Post, other States.

LONSDAIE cn ST. S WF

MORNINGS

48 Radio, Television & Hobbies, June, 7964 to size and smoothed. Two holes are After the front glue has set, the edges drilled in the edge of these blocks, and back of the panel may be treated between the plys, about Tin from each with glue and the rest of the speaker end. These should be clearance holes fabric pressed into place, trimmed if "OXFORD" for two wood screws whose total length necessary, and secured again with staples should not exceed }in. Temporarily slide or tacks. the front panel into place and draw a When the glue has dried the edges INSTRUMENT CASES, pencil line on the interior of the two may be trimmed with a razor blade sides where the back edge of the front and where the speaker is to be, mounted CHASSIS AND PANELS panel reaches. the material should be carefully removed Remove the front panel, temporarily to allow the speaker to sit flat on the SPEAKER CASES slide in the chassis, and mark the sides panel. Next mount the speaker on the above the height of the chassis. The two front panel with four short wood screws. Round blocks may now be lined up within the If all the work has been carried out SP.3 3in hole 1 12 6 confines of the marked area to clear correctly it will be found that the front SP.4 4in hole 1 15 0 the chassis and support the front panel panel will press into the front of the flush with the front of the cabinet. Tack cabinet neatly and can then be fastened SP.5 Sin hole 1 17 6 and glue the blocks in place making sure with the woodscrews through the two SP.6 6in hole 2 5 0 that the panel pins used are shorter than blocks. SP.8 Sin hole 2 7 6 the combined thickness of the cabinet It will probably be found at this stage Plus 121% tax and the block. When the front panel is that the speaker fabric is a little loose. fitted it is only necessary to push the Oval four screws through the two blocks and With most speaker coverings this defi- screw them into the front panel. ciency is easily cured. Set up a radiator SP.53 5x3 hole 2 7 6 The front panel should be cut to slide on your work table and pass the front SP.74 7x4 hole 2 17 6 easily into the cabinet, making allowance of the cabinet back and forth across SP.96 9x6 hole 3 15 0 for the thickness of the speaker fabric the radiator, being careful not to scorch Plus 121% tax selected. Line up the front panel against the material. When heated the speaker the controls of the mantel set and fabric will shrink and tighten up appre- CRYSTAL DIODE NOISE mark the centres of the controls. ciably. GENERATOR Oct. 1963 Having drilled all necessary holes in The speaker wires fitted to the chassis Case MC4 15 0 Chassis and Plain PARTS LIST Front Panel 2 12 6 1 225-0-225 V 50 Ma transformer, 1 3-30 pf trimmmer Printed Panel 19 6 6.3V, 2 amps. 1 selected capacitor for feedback Engrave Panel 2 10 0 2 BY 100 silicon diodes. circuit 1 4" square 15 ohm speaker. Plus 121% tax 1 7000-15 ohm speaker transformer RESISTORS 2 9 pin ceramic valve sockets All ratings 1 watt unless otherwise PLAYMASTER 106 1 6GW8 valve specified Case ' 2 15 0 1 6AN8 valve 1 100 ohm Chassis 2 8 6 1 Miniature RF coil, broadcast. 1 150 ohm Printed Panel 19 6 1 Aerial terminal 1 180 ohm Engrave Panel 2 10 0 3 Change-over jacks and plugs to 1 2,700 ohm Dial Assemble 1 15 0 suit. 1 5,000 ohm, 5 watt 1 7 contact tag strip. 1 9in length 1 6,800 ohm Plus 25% tax miniature terminal strip. 2 10,000 ohm 2 Knobs 1 12,000 ohm MULTI METER, May 1963 1 Dial 1 39,000 ohm Case and Fittings 5 0 0 1 Chassis, 91x41x2 inches. 1 47,000 ohm Printed Panel 1 10 0 1 68,000 ohm Engraved Panel 3 5 0 CAPACITORS. 1 220,000 ohm 1 3.3 pf ceramic 1 270,000 ohm Plus 121% tax 1 150 pf mica 1 250,000 ohm C taper poten- 2 180 pf 200 VW plastic, or one tiometer or alternatively ALL GOODS PLUS FREIGHT only for varible regeneration. 1 250,000 ohm C taper poten- SLIGHTLY HIGHER FROM 1 470 pf 200 VW plastic tiometer with twitch AGENTS. 1 .0033 mfd 200 VW plastic 1 1 megohm C taper potentiometer Gerrard and Goodman Limited, or alternatively with twitch or alternatively 192 Rundle St., ADELAIDE. 1 .001 mfd 200 VW plastic (vari- 1 2,000 ohm carbon pot. and 8-0242. able regen.) 1 1 megohm, 1 watt resistor 2 .01 mfd 400 VW plastic Homecrafts Tasmania. 3 .022 400VW plastic MISCELLANEOUS 199 Collins St., HOBART. 1 .047 mfd 400 VW plastic Wire, solder, screws, nuts, flex, 3 2-2711. 2 50 mfd 12 VW electrolytics pin plug, solder lugs, shielded wire, Pakbar Pty. Ltd., 1 50 x 50 mfd 350 VW electrolytic contact adhesive fabric, 1'' plywood 38-44 Stone St., WEST PERTH. 1 Single gang tuning capacitor and speaker fabric. Tel. 28-2431. Martin De Launay Pty. Ltd., Darby St., NEWCASTLE. B4741 the front panel and smoothed all edges, sshould be left quite long. Extend these Broadway Electronics Pty. Ltd., it is ready for the speaker fabric. If a sspeaker leads with the chassis sitting 52a Keira St., WOLLONGONG. thin material or open weave material is tbehind the cabinet and solder them to 2-1402. used it is sometimes advantageous to tlthe speaker terminals. Now push the paint the front of the panel with black cchassis into the cabinet so the controls D. Irvine and Co., paint. We used a plastic black paint aare touching the speaker fabric. Part 401 George St, BRISBANE. 2-4310. mainly because it was available and tthe strands of the speaker material with Manufactured by: dried quickly. a small instrument, such as a pocket Cut the speaker fabric to size, allow- sscrewdriver, and push the controls ing a generous overlap on all sides, tthrough. If possible do not break the HEATING SYSTEMS Secure the material to the back of the tthreads of the speaker fabric as they top edges with several staples or small rmay run. Mark control shafts for the PTY. LTD. tacks. Now smear glue over the front ccorrect length, remove the chassis and of the panel, stretch the material tightly ttrim the length of these shafts. 97 MARRIOTT STREET, across it, and secure at the back of The final step is to align the adhesive REDFERN, N.S.W. the bottom edge as before. The glue we cdial plate correctly on the front panel 69-3764 69-7616 used is virtually colourless when set. :and check the calibration of the tuning. Radio, Tefevition & Hobbies, June, 7964 CLEARANCE SALE

EXCLUSIVE TO HOMECRAFTS

ALL GOODS MIST BE SOLD DY JUNE 30th EVERYTHING BRAND NEW! RUSH THESE WHILE STOCKS LAST

CLEARANCE OF DUCON POTS CERAMIC SOCKETS AERIAIAERIAL FOR TRANSISTOR Min. 7 and 9 Pin, Skirted . . 3/6 ea. PORTABLES ALL BRAND NEW 7in to 39in9 13/6 ea. IOOK With DPST Switch . . 7/11 ea, MIN. PLUGS & SOCKETS 4'"4in long "extends to 18ins . . 5/- ea. 1 MEG With DPST Switch 7/11 ea. 3, 4 and 5 Pin 2/- pr. Have doubledot thread to fit all makes of portables. 2 MEG With DPST Switch 7/11 ea. MIN. PHONE PLUGS 500 K With Push-Push Suitable for Transistor Radios, MINMINIATURE BANANA Switch 8/6 ea. Transistor Tape Recorders, PLLKPLUGS AND SOCKETS 1 MEG With Push-Push etc Switch 8/6 ea. 1/11 ea. 5 ColoursColours. 1/6 pr. 250 K Plain 4/11 ea. Tin TAPE SPOOLS —6/- All purposepurp 240V A.C, Solenoids. 500 K Plain 4/11 ea. 5in. Tape Spools 4/- ea. 20/- eo. (Weight 31b) 1 MEG Plain 4/11 ea. Fit all makes recorders. 6/- ea. 2 MEG Plain 4/11 ea. WIRE SHELVES 50 K Ganged 14/11 ea. NEON TEST SCREW-DRIVERS 110V to 380V 5/6 ea. 20in x 14|in 100 K Ganged 14/11 ea. Suitable Barbecues, Fridges, Display, 250 K Ganged 14/11 ea. Spare Neons 2/6 ea. etc. 2 MEG Ganged With DPST 17/11 ea. TERM BLOCKS 5/- ea. (Weight 31b) 2 Colours 1/6 ea. 3 Colours 2/- eaea. Brand-new J h.p. 240V 50C A.C, CLEARANCE OF NEW VALVES Motors, 1440 R.P.M. PACKED IN ORIGINAL CARTONS TEST LEADS £6/10/- F.O.R. 6E56 R.F. Amp 10/- With Banana Plugs. . . . With Small Pins 4/3 pr.' GENUINE ARMY PRISMATIC 6ET6 R.R. Amp 10/- With Alligator Clips. . . . 6J5/G Triode Amp 10/- 4/6 pr. COMPASSES. CARD TYPE 6U4G/T Booster Diode .. 10/- NEW ELECTROLYTICir 55/-:>J'- eo.eo- 6X2 H/W Rect 10/- C ensers 6CQ6 R.F. Amp 10/- 5o m,d. 3 ^ ,/... TAPE SPECIALS 6DB5 Beam Amp 10/. Tenm d 2251C \/ |» , l/1/ ea -2111 A IWUll l*lCb5MniiiiiimMimniniiniminiiii>i»Hiii»iiinmimiiiiiiiiiiiiitimii>iimiMiniiiii»»miiiniiMiniiniininmnniitiiiit 1 B Bott Turnover Crystal Cartridges, std. lin mount. 10/- ea. 290 LONSDALE ST., MELBOURNE. FB3711 Sapphire Style for above .. 3/- ea. Call or torlfe Note! Trade Supplied

Radio, Teleyisian & Hobbies, June, 1964 //Of

no m

OO Q O

V nW n % t

ABOUT

PHASE C? *?. DISTORTION I~]

A correspondent raises a question which is not altogether new to these a discontinuous step such as a square wave may turn into a number of minor pages but which is of sufficient interest to warrant further mention. He steps and the result sounds "fuzzy." is concerned that nobody seems to pay much attention to the matter Having demonstrated the importance of phase displacement in audio amplifiers and that this neglect is pre- of phase shift, the point of argument sumably causing us to tolerate poorer quality than need be. (question) I wish to raise is the apparent neglect of the importance of phase re- By Neville Williams lationships in your technical articles and in technical articles generally. THE correspondent, D. O'K., of Isling- also be free from "boom," resulting In the recording process, the bass is ton, N.S.W.. begins as follows: from loudspeaker cone and cabinet attenuated and the treble is boosted ac- Dear Sir, resonance. cording to R.I.A.A. specifications with In present HI-FI systems it is rela- There are one or two other points in inductive — resistive — ca pad live net- tively easy to obtain adequate frequency the par. which invite comment but, per- works. Now any passive electrical net- response and low distortion, leaving as haps. later. The letter continues: work which preferentially attenuates the principal criterion of excellence a Consider a square wave as representa- specific frequencies necessarily has an thing which is variously referred to as tive of a transient input. A system will inherent phase shift. A roll off of six "presence," "brilliance" or "transient re- have perfect transient response if it can decibels per octave corresponds to 90 sponse." Three of the expensive <£800- reproduce a perfect square wave input as deg. phase shift. £1,200) commercial radiograms I have a perfect square wave output. Now a If ive assume that the record is re- heard were characterised by excellent square wave is merely an infinite series played by a constant velocity pickup transient response. of a sine wave and its odd harmonics and is exactly equalised by passive net- Let's pause to register some puzzle- of the form sine X plus 1/3 sine 3X plus works in the preamplifier, the relative ment about this opening paragraph. The 1/5 sine 5X plus 1/7 sine 7X plus . . . phase of the harmonics is shifted back writer treats as synonymous three terms etc. This can be worked out from to the correct relationship. There exists which certainly aren't so in common no problem yet, although noting that six Fourier analysis. decibels per octave is 90 deg. phase usage. It is obvious that the higher order of "PRESENCE" is normally associated harmonics contribute little to the wave- shift, the equalisation must be very exact. with the tendency of equipment to em- shape and it is not therefore necessary What now happens when passive lone phasise voice or perhaps solo instru- to have infinite frequency response to control networks are introduced? These ments. Technically it can usually be produce an acceptable waveshape; but networks will introduce a spurious phase resolved into a prominent middle regis- the lower order harmonics must be pre- relation between the harmonics which is ter (1000 to 3000 cps). The now sent in the correct amplitude and phase, not characteristic of the original pro- common "Presence" control in guitar i.e., a system must be linear and have gram, and this modification must play amplifiers, for example, affects mainly zero phase shift over the frequency havoc with any transients in the record- this range of frequencies. range which contains sufficient funda- ed material. "BRILLIANCE" normally describes mentals and harmonics as are considered If you graphically plot the series for the general balance of sound, although necessary to produce a sufficiently good a square wave and then phase shift the individuals differ greatly in their assess- approximation. third harmonic by 10 degrees, you will ment of what is dull, normal or brilliant. If the amplitude of any of the har- easily see how important even small de- In technical terms, "brilliance" is likely monics is altered between the input grees of phase shift are. Of course, the to signify a treble response which is at (microphone) and the output (speaker), fundamental is phase shifted also and it best sustained but which possibly rises the square wave transient is proportion- is only the differential phase shift be- gradually with frequency, or peaks in the ally altered. Hence the need to have a tween the harmonics which is important. 8-10Kc. region. On this basis "brilliant" reasonably linear system. Now if the record is replayed by a reproduction may lack "presence." Hut the effect of phase shift of the crystal cartridge, the position is even TRANSIENT RESPONSE describes important harmonics is much more de- worse. The crystal cartridge equalises the ability of a system to reproduce vastating than any minor departure from the frequency bias of the recorded mat- percussive sounds faithfully. Good tran- linearity. If a low order harmonic is erial but, unlike the constant velocity sient characteristics require sustained phase shifted differentially with respect magnetic cartridge with passive treble response but the bass end must to the fundamental and other harmonics, equalising networks, it does not restore Radio, Television & Hobbies, June, 1964 B1 THE NEW ADVANCED STAR AMPLIFIER

24-Watt Stereo Amplifier pwwIB t

SA-30 r STEREO CONTROLS 3-Po$ition Selector Switch £55 ©4-Position mode Switch —Mono Left. Mono Right, Stereo, Reverse ©Dual Concentric Treble Control STAR SA-30 j ODual Concentric Bass Control ©Dual Concentric Volume/Balance Control Pilot Light Indicator •0 # ^ • # 3 Q Rumble Filter Switch Phase Reverse Switch X9" ©Speaker-Headphone Selector Switch

SPECIFICATIONS Power Output: 12 watts per channel stereo. 24>watts monaural operation. Frequency Response: 20-100,000 CPS ± Idb at 1 watt, 50-50,000 CPS Idb at 12 watts. Hum and Noise: Mag Phone—56 db below rated output, Tuner—73 db below rated output. Distortion: less than 1% total harmonic distortion at 12 watts (IKC), loss than .25% total harmonic distortion at 1 watt (IKC), Sensitivity: Low Level (Mag Input) 5mv at full output, High Level .6v at full output. Outputs: Dual 8 and 16 ohm impedance speaker outputs. Dual Tape outputs, Tuba Complement: Total of 8, 3-12AX7, 4-6GW8, 1-5AR4. Dual 12-Watt Stereo Amplifier ■■■■■ Coupled With a Versatile Stereo Preamplifier... Performance The Equal of Units 2 & 3 Times Its Power & Price.

CHECK THESE Brilliant Stereo Performer ... an amplifier with the wide-range frequency response, QUALITY FEATURES low distortion, low hum and noise characteristics you'd expect of amplifiers 2, even 3 times its power rating and many times its price. A full range ot control facilities have been provided to assure complete Stereo capability and flexibility. Two dual Stereo Headphone Jack concentric Bass and Treble controls provide separate and individual tone controls for. each channel. A dual concentric volume Control acts as an independent level Independent Concentric Bass & control (or each channel and allows precise channel balancing. Fast, easy operation between Stereo. Reverse Stereo, Monophonic Left channel and Monophonic Right Treble Controls For Each Channel channel Is furnished by a Mode switch. A selector Switch furnishes switching from Aux, Tuner or Phono music sources In addition slide switches ate included for: Concentric Volume Balance Control Rumble Filter (off-on) Phase (normal-reverse) and to lake full advantage of the front panel Headphone jack a switch is provided for speaker or phone operation. Paired Frequency Response: 20-100,000 CPS inputs located on the rear panel accommodate any of the ordinary stereo sound sources-inputs ate included tor magnetic, crystal ot ceramic cartridges; Tuner, ± 1 db at 1 Watt tape or auxiliary (high output) plus Tape Out jacks for recording through your tape recorder. Beautifully styled In a low silhouette enclosure, color keyed to do justice to any Hum ft Noise—73 db Below Rated Output decor. Ivory and gold front panel Is contrasted by gold metal knobs and enclosure. Complete with cage and legs. Size: 5V$Lxl27/»Wx8Vi"0. Shpg. wt., 20 lbs. High Sensitivity Allows Use With All Stereo Cartridges

AUSTRALIAN DISTRIBUTORS

MAURICE CHAPMAN & GO. PTY. LTD. Brisbane, Chandlers Pty. Ltd. • Adelaide, Neil Muller Ltd. Melbourne, V. Brull Pty. ltd.

52 Radio, Television & Hobbies, June, 1964 the correct phase relations. Any phase aas an oscilloscope trace — a line which shifting introduced by the crystal cart- aallegedly means nothing to the ear, ridge is arbitrarily related to the correct bbecause the ear is concerned only with situation, being a function of the equiva- ocomponents, not with their instantaneous THIS IS lent capacity and various mechanical aarithmetic sum. compliances of the cartridge. One point might have to be conceded, Other sources of phase shift arise in however.h Insofar as the trace or the TERRIFIC! the amplifier itself, the loudspeaker ggraph also indicates instantaneous dis- crossover network, and the spatial dis- Pplacement of the hearing mechanism, placement of the speakers in multiple eenvelope shape may produce auditory HO MORE TANGLED CABLES speaker systems. ddifferences if the amplitudes are such The phase shift of a valve amplifier aas to involve substantial physiological is, for all practical purposes, as good nnon-linearity. (Those who like to argue TEMPLE as its linearity. aabout audible beats may enter at this The same applies for speaker cross- ppoint!) over networks as for tone control cir- However, assuming this non-iinearity WIND UP CABLE REELS cuits, and spatial displacement of the t(to be an abnormal condition, our cor- loudspeakers is only important at high rirespondent's visual-graphical analysis of SOLVE THE PROBLEM frequencies. eenvelope shape lends no support to his While I realise that many of these ccontention that the effect of phase shift problems must result in a compromise oof the important harmonics is "much solution, many of them appear to be nmore devastating" that differential overlooked completely. I would appre- aamplitude changes. date your comments on the subject and would like to compliment you on the BY' WHAT TEST? quality of your magazine. I wonder also what subjective "proof" Yours faithfully, D. O'K. hhe has for the statement that a square P.S.: These arguments strongly favour wwave, disfigured ONLY bv differential a system having a constant velocity cart- Pphase shift, sounds "fuzzy." It might be ridge with exact equalisation, no lone rrather difficult to produce such a wave! controls, a very flat amplifier with very On this overall basis I am far from wide frequency response (2cps. to 100 bbeing convinced as I reach the line in Kc.) and a single loudspeaker or coaxial hhis letter "Having demonstrated the loudspeakers with mechanical crossover. ''importance of phase shift . . . etc." Motional feedback around the speaker Purely as an interlude, 1 might should also contribute much. nmention that the capacity of our ears Well now.. . tito locate the direction of sound is some- Let me lead off by saying that phase 'jtimes put forward as an argument that is a subject over which a great deal of 11the ear is extremely sensitive to phase. What it demonstrates is, in fact, confusion resigns. I suspect that much 1!. Wherever on extension flex Is required of it stems from failure to distinguish is that ears (plural) can compare and for the remote operation of electrical ap- between phase relationships in sound ^draw conclusions from the phase differ- paratus TEMPLE coble reels are tfie eence—and loudness—of any given signal answer . . . for garage, factory, work- external to the amplifier, and in equiva- a shop, home or business premises gener- lent electrical signals within the arriving at the separate ears. The signal ally. reproducing chain. ccan as easily be a pure sine wave. 1 hope to show a vital distinction. The observation has nothing whatever LIGHTWEIGHT, COMPACT Thinking first of native sound, there ^to do with the ears' evaluation of phase seems to be fairly broad agreement that onj an absolute basis nor with the PORTABLE, AVOID the ear is not sensitive to phase and that, ?differential phase relationship between TIME-WASTING TANGLES in the everyday acoustic environment, frequency_ multiples, which is the subject • Fully approved twin plug outlet with phase is a completely random quality. of present discussion. built-in double pole switching permits In short, it is hard to withstand evi- use of two pieces of electrical appara- Subscribers to this view point out that jdence that, at a purely acoustic level, tus at the same time with complete normal sound is a complex of frequen- phasen is a pretty random quality. Music- safety. cies, which travel by direct and devious aally, a great body of overtones are not • Interlock prevents reel being revolved paths from the source to the hearer's precisep harmonics at all and their rela- whilst apparatus is plugged In, thus safe- ears, undergoing random absorptions, ti guarding plugs and leads from damoge, tionship to one another is continually • Fitted with heavy duty 250 volt 10 amp reflections, reinforcements and cancella- cchanging. Those harmonics which are cable for AC or DC use. tions en route. Since these random pprecise multiples at the point of origin • Rugged steel frame protects spool and effects will differ for each individual aare subject to differential and random fittings from damage. harmonic in a complex wave structure, sshift from the acoustic environment. • Carrying handle and crank make rewind- the arithmetic waveshape at any given Chaos? ing for transport and storage simple and point of perception will inevitably differ No, certainly not. This is sound as rapid. from that at the point of origin. tl • Self lubricating bearings permit spool the good Lord made it. (Please pardon to revolve freely, removing drag from 11the cliche but you know what I mean). cable. SUBJECTIVE TESTS So we take its electrical equivalent According to literature on the subject, a MODEL CR240A WEIGHT PRICE as a signal from the microphone and 10ft cable Tib C 10 17 0 the point has been demonstrated by fifeed it through amplifiers and things. 50ft cabla 131b IIJ IT 0 inviting people to listen to multiple har- Now comes the big question: Because 100ft cabla 181b IIS u • monics, which can be shifted in phase p phase has been so random thus far, can MODEL CR240B relative to each over. The finding seems vwe continue to treat it as such? (Off cabla I2lb £ 13 0 9 to be that the subjective effect of the lOOff cable 2llb £18 0 0 mix is independent of relative phase; that Here I must appear to change sides. 200ft cabla 31 lb £21 14 0 the ear simply reacts on the basis that . I don't think we should — but not 300ft cabla 4llb £25 18 c because a certain state of randomness the complex sound contains certain fre- ^suddently becomes "sacred" at the am- TRADE ENQUIRIES INVITED quencies in certain relative amplitudes. plifier input. My reason is simply that Visually, the wave envelopes may look pphase and frequency response are sub- quite differend on an oscilloscope and sstantially interwoven. If it can be shown many find it hard to believe that waVe- tlthat there is something drastically amiss forms which look so different can j, in terms of phase, then frequency re- & CO. PTY. LTD. actually sound the same. However, ears pponse must be viewed with suspicion. and not eyes are the organs concerned ■Thus,] whether or not phase is important in this, and the findings are not so j,in itself, it is a pointer to something 428 ELIZABETH STREET, surprising, really, considering the way eelse that certainly is. MELBOURNE, Cl. in which the ear functions. No less important, the whole line of The graphical exercise described by tlthinking is substantially true in reverse. Phone 34-6539 oUr correspondent yields the same result IIf a reproducing system is adjusted to Radio, Television & Hobbies, June, 7964 A WHOLLY OWNED SUBSIDIARY OF MASTER ELECTRICS PTY. LTD. MOTOR SPARES LTD.

SPECIALS * SPECIALS * SPECIALS * SPECIALS 1. Miniature tools, made in Germany, ex- 18. Record cleaning brush can be attach- 36. Job Wire-wound Pots. 100, 500 and cellent for transistor, TV tuner and other ed to any pickup. Price 2/ each. 3,000 ohms. Price only .... 3/3 each. compact electronic equipment service. 19. 40 ma Power Transformers, vertical 37. Job PM104 6 volt Synchronous Vibra- 6AH Side Cutters Price 14/ mount manufacturers type. Primary 240 tors. Price only 5/9 each. 1011 Snub Nose Pliers 11/9 Volts AC, 50 C.P.S. Secondaries 180-0- 38. Wire-wound Resistors. Price 1008 Long Nose Pliers 12/11 ea. 180 6.3 volts at 2 amps. Two hole mount- 25 ohms 1 watt 6d each. 2. Adjustable wire stripper, made in Ger- ing. Brand new. Price only .. £1/9/0. 12, 21, 200, 450 ohms 3 watt .. 8d each. many can be preset for any gauge of 20. 50 ma power Transformer, vertical 125, 600, 700, 750, 800, 1000, 1250, 1500, wire. A handy tool for the Radio and mount manufacturers type, primary 240 3500, 6000, 7000 ohms 5 watt 9d each. Electronic Serviceman and Electrician. volt AC Secondaries 225-0-225, 6.3 volt 125, 1250, 1500 ohms 10 watt .. 1/ each. Price 17/6 ea. at 2 amps. Two hole mounting. Brand 5500 ohms 12 watt 1/ each. 3. ECT. 208 Condensers, 100 mfd, 10 new. Price only £1/10/0. 50, 75, 125, 150, 175, 200, 300, 400, 700, volt, 50 mfd, 150 volt plus 30 mfd 150 21. Imported Extension speaker in plastic 850, 4000, 5000 ohms 20 watt 2/ each. volt upright can type. Worth 15/. case with 4-inch diam. speaker. Voice 50, 75, 100, 125, 175, 200, 250, 300, 400 Only 2/ ea. coil impedance 3.2 ohms, very attractive ohms 25 watt 2/ each. 4. Germanium Diodes, well-known make. and complete with 18 feet flex and minia- 500 ohms 27 watt 2/ eacn. Brand new and perfect. Ideal for use in ture phone plug. Price only £2/10/0 ea. 100 ohms 40 watt 2/6 each. crystal sets, transistor portables, video de- 22. Tech Model TC2 Tube Tester. Will 120 ohms 80 watt 3/ each. tectors, etc. Price only 3/6 ea. test all modern type tubes, compact and 36 ohms 100 watt 3/ each. 5. Hinges for record players N.P. de- ideal for either portable use or on the 2000 ohms 150 watt 3/ each. tachable type. Price only 1/6 pair. bench. Price £15 plus 12}% sales tax. 39. Carbon Resistors. 470, 500, 2000, 6. Suitcase catches, ideal for portable 23. Spiral type TV indoor antenna with 10,000, 15,000, 25,000, 350,000 ohms } gramo cases, etc. Price, only 1/ base for use on top of receiver. watt 3/ Dozen, assorted. 7. Stereo Pick-up Arm complete with turn- Price £1/5/0. 25, 390, 500, 600, 700, 800, 850, 900, over cartridge with two sapphire needles 24. DX type Silver Ribbon antenna, can 1,200, 1,500, 2,000, 2,500, 3,000, 4,000, and pickup rest. Price only 33/ plus 25% be tuned to any channel and is unbreak- 5,000, 6,000, 7,000, 7,500, 15,000, 25,000, sales tax. able. For use on the top of receiver. 65,000, 75,000, 80,000, 280,000, 300,000, 8. Ceramic Cartridges. These will last in Price only £1/17/6. and 5 meg 1 watt . .5/ Doz. Assorted. any climate and are ideal for use in the 25. BM3 Microphone complete with cord 470, 800, 4,700, 25,000, 40,000, 50,000, tropics. They will fit any normal pick- and phone plug, inbuilt on-off switch. Can 100,000, 200,000, 250,000, 400,000, up arm and have a standard needle and be screwed to any type stand or used as 470,000, 500,000, 2 watt .. .. 9d ea. diamond L.P. needle. Frequency response hand mike. Price 54/ each. 3,000, 6,800 ohms and 3 meg 3 watt 40 to 15,000 cycles. 26. 7C7 Valves ideal for use as pentode lOd ea. Mono Cartridge £2/6/11 plus 25% sales R.C. amplifier in radios and other equip- tax. ment. Price only 2/6 each. 40. CONDENSER BARGAINS Stereo Cartridge £2/12/10 plus 25% sales Loctal sockets to suit 2/3 each. Capacity Volt. Type Price tax. 27. Selenium Rectifiers, DC output 12/15 .00008 mfd 2.000 Mica Block . .. 1/ 9. Jemco Multimeter Model MT114. Sen- volts all brand new. Ideal for battery .00017 mfd 4,000 Mica Block . .. 2/6 .001 mfd 5,000 Mica Block . ., 3/ sitivity 4000 O.P.V. Dimensions 3i x 4| chargers, etc. .005 mfd 1,750 Mica Block . .. 3/ x 1J inches. Weight 91b. Ranges DC 2} amp 31/ ea. .01 mfd 2,000 Mica Block . .. 3/ Volts 0-10, 50, 250, 500, 1000. AC Volts 5 amp 49/6 ea. .02 mfd 1.000 Mica Block . .. 3/ 7} amp 74/3 ea. .01 + .005 0-10, 50, 250, 500, 1000. DC Current + .001 mfd 600 Paper Block . .. 2/ 0-250 microamps, 0-5, 250 ma. Resistance 28. Power Transformers for Battery .01 + .01 mfd 2,000 Paper Block . .. 2/ 0-20,000 ohms. 0-2 meg. ohms. Decibels Chargers. Primary 230/240 volts 50 cycles .5 mfd 600 Paper Block . .. 1/6 Minus 20 to plus 22 db. plus 20 to plus Secondary 8.5, 10, 11.5, 17 volts at 4.2 1 mfd 500 Paper Block . .. 1/9 amps. Suitable for use with above rec- 1 mfd 1,000 Paper Block . .. 1/9 36 db. Usual price £4/17/6. Reduced 2 mfd 400 Paper Block . .. 2/3 to £3/3/0 plus 12}% sales tax. tifier. Price £2/16/9. 2 mfd 600 Paper Block . .. 2/6 10. Tape printing machine ideal for mak- 29. Silicon Diodes, ideal for use as a 4 mfd 600 Paper Block . .. 4/ ing self adhering nameplates for ampli- power rectifier. Peak inverse voltage 400, 4 mfd 800 Paper Block . .. 4/6 S + 5 + 5 110AC Paper Block . .. 3/ fier and radio equipment, switchboards, average rectified current 500 ma at 70 deg. 16 mfd 400 OH Filled Block . ,. 10/ etc. Price £8/18/0. N.S.T. Spare reels of C. Worth 12/. Our price only .... 6/9 .001 mfd 400 Mica . /9 tape all colours 13/4 plus 12}% sales tax. 30. Hioke SE37B Multimeter with push- .002 mfd 400 Mica . .. 1/ 11. Nibbling tools made in the U.S.A. button switch system. With this meter .01 400 Mica . .. 2/ These are ideal for cutting any type of required range can be selected quicker .02 400 Mica . .. 2/ hole, round or square in metal chassis. and with less risk of damage to meter 4 mfd 350 Electrolytic .. /9 Price £3/15/0. than with any other type of meter. Sen- 41. Multi Electrolytic Condensers, 20 mfd 12. Collaro 240 Volt AC Motor. Has sitivity 20,000 O.P.V. DC and 8000 O.P.V. 350 PV plus 40 mfd 200 PV Plus 200 part of mechanism to allow for 3 speeds AC, DC volts 0-1, 10, 50, 250, 500 and mfd 40 PV plus 20 mfd 40PV. to be obtained. Worth £4/10/0. Price 1000. AC volts 0-10, 50, 250, 500 and Price Only 7/6 ea. only 39/6 ea. 1000. DC current 0-15. 10, 50 ma. Resist- 42. Metal Rectifiers 100 volts AC at 5 ma, 13. Single magnetic ear pieces, 8 ohm and ance 0 to 5K. 500K, 5 meg ohms. Capa- suitable for Dry Battery re-activation, 16 ohm, complete with cord and minia- citance 250 pf to .02 mfd. Price only meter rectifiers, etc. Dimensions 7/Sin ture phone plug. Usual price 12/6. Re- £7/19/6 plus 12} % sales tax. long x }in diameter. Pigtail connections. duced to 5/9 ea. 31. Metal speaker boxes. Ideal for public Price only 2/ ea. 14. 815 Twin beam power output RF address systems in Halls, Hotels, etc. Avail- 43. Bakelite Handles, suitable for record amplifier tubes. Can be used as AF able in 5, 6 and 8-inch sizes. All brand players, suitcases, tape recorders, etc. power amplifier and modulator class AB2 new and less speaker. 5-inch, price Cream or Brown. Price only .... 2/6 ea. to give 54 watts output. Brand new and £1/7/6. 6-inch, £1/8/6; 8-inch. 44. Miniature 455 Kc I.F. Transformers, boxed. Price only 10/ ea. £1/12/6. complete with mounting clip. Brand new. 15. Adjustable Padder Condensers, capa- 32. Miniature push-pull transistor ampli- Price only 7/6 ea. city approximately 420 pf maximum. Suit- fier. These amplifiers are supplied on print- 45. 2A3 Valves in original car- able for 455 KC oscillator circuit. Price ed circuit board and are ready for build- tons 12/6 ea. only 1/ each. ing into transistor radios, record players or 46. 6N7G Valves in original car- 16. Type A chassis punch set. Screw for use on midget P.A. systems supplied tons 10/ ea. type—sizes 16 m/m, 18 m/m, 20 m/m less volume control, speaker and battery, 4 47. Meter Rectifiers 1 MA Type, complete and 30 m/m. Price £2/17/9 a set N.S.T. transistor price £4/16/; 5 transistor with Mounting Screw. Brand New. Price 17. Type 821 H Radio Tool set, contents: £7/10/. only 30/ ea. 2 screwdrivers, I spintite, 1 tweezer, 1 33. Rofo Transistor. Ignition coil, 300 48. CRC 2.26 Water repellant in 16oz tape reamer, 1 set files, I combination to 1 Ratio for RH Transistorised Ignition. pressure packed can. Displaces water and pliers, I long nose pliers. I side cutter. £4/15/- plus 12}% sales tax. moisture, protects metal surfaces, lubri- Price only £3/19/6 a set. N.S.T. 34. Job Carbon Pots available in the cates, etc. For use on electrical equipment ! following values: 20,000, 25,000, 50,000, of all kinds, including radio and TV, re- SPECIAL NOTICE , 100,000. 150,000, 250,000, } meg. and 1 stores equipment after total immersion in All parcels sent Rrghtercd Post unless other- j meg. Price only 1/6 each. water, cleans and lubricates switches, wise stated. Postuae or Freiahl must be 35. Job Carbon Pots with Switch. } meg variable controls, etc. A must for the TV included with order. and 1 meg. Price only 5/9 each. Technician. Price 30/ can. 547 ELIZABETH STREET, MELBOURNE — Phone 30-0271 BRANCHES THROL'GHOL'T VICTORIA AND RIVERINA

54 Radio, Television & Hobbies, June, 1964 give a flat response from microphone to haps of necessity, chooses to play his tributes of piezo-electric pickups in speaker there or every chance that its records at low volume but with boosted strong contrast to his championing of phase relationship, output to input, will bass and treble? Who is to tell him mechanical cross-over for loudspeakers, be linear for frequencies within the "flat" that, even if he likes it that way, he If phase relationships are random and region. mustn't enjoy it because of what he their effects are bad in pickup "mech- Broadly, this is the concept behind the has done to phase? anics," then surely they must be no less design of most wide - range amplifier There's another aspect of our cor- so in speaker "mechanics." equipment, including our own "Play- respondent's letter that I view with con- And here we get into waters deep master" series. Phase response character- siderable misgiving. He admits the enough for any amount of argument, istics are not ignored; they are looked almost automatic relationship between There are all kinds of unresolved after, more or less automatically, along frequency response and phase in elec- arguments about what happens to phase with the frequency response. trical networks but he goes on to con- in electrical filter networks. In fact, as we have stated at some demn piezo-electric pickups, as a class, There is a tendency to overlook phase length in past years, the vagaries of the on the basis that they produce frequency as a by-product of mechanical manipula- two come in for a lot of attention in response characteristics which are un- tions and shapes. connection with negative feedback loops related to phase displacement. Do you realise, for example, that and stability margins in the supersonic To be sure, piezo-electric pickups tend tweeter cones in twin-cones speakers can region. In studying square wave response to exhibit more irregularities in response be positioned and shaped to phase out with an eye to overshoot, ringing and than magnetics but largely because the the mid-frequency peak of the main instability, we are, in fact, studying the emphasis in their design is on output cone just behind them? This, in addition transient response of the basic amplifier, and economy rather than smoothness to their prime function. So we have the What is more, the system we have at any price. If they are open to criti- example of "single unit" speakers always tended to favour is one using a c'sm in terms of "ultimate fidelity," the actually delivering anti-phase signals constant velocity (magnetic) pick-up, a condemnation needn't be confined to from their two cones, pre-set equalising stage, a minimum of phase. We have manufacturers who strongly arbitrary "tone control" and a basic am- But barring obvious resonance effects, favour single unit speakers, plifier with a wide, flat frequency re- which are undesirable on any count. Manufacturers who as strongly push ponse. what grounds are there for claiming the claims of coaxially mounted speakers. Almost certainly, the "satisfactory" that response and phase are randomly Manufacturers who prefer to separate amplifying systems referred to by our related because they have to do with their sound sources on the basis that, correspondent in his first paragraph cartridge capacitance and mechanical this way, they can concentrate on each would have been along these lines and compliance? Unless 1 miss my guess, separately and achieve lower inter- not radically different from our own 'he relationship would be as valid here modulation. "prestige" designs. as in a passive electrical network. Strangely enough, the best examples Two points should be stressed which What's more, I would expect to find of all the different techniques can sound might easily be overlooked. that an accurately compensated piezo- very good, irrespective of any dreadful The first is that an optirwum amplifier electric P'ckup would give frequency things that might have happened to of this general type, will show marked and Phase relationships indistinguishable phase. phase rotation between the pick-up in- fronl an accurately compensated mag- Could it be that the signal, having put and loudspeaker output terminals. net' wave.) Combination of a Ledex rotary solenoid with anl)2r| Why have tone controls? Simply be- array of 8, 10, 12, 18, 20 or 24 position Oak-type cause people like the facility. switches for the remote control of predetermined ^vTjr If the controls can be set to a strictly level position, they should not modify the phase relationships of signals passing Other Ledex products are ready to work as compact solutions to your through them. If properly designed in circuit switching applications. Write or phone for literature mentioning other respects, their presence should not applications to .. . make any material difference to the sound as heard. But if a listener decides that certain MANUFACTURERS SPECIAL PRUDUCTS PTY. LTD. records sound better with the controls 47 York Street, SYDNEY. 2 0233 in other than the "level" position, he Mslbourne: Amalgamated Wireless (Australasia) Limited. Brisbane: Chandlers Pty. can hardly be condemned. There is a Ltd. Adelaide; Newton McLaren Ltd, Perth: Atkins (W.A.) Ltd. Carlyle & Co. (1959) chance that in so modifying balance, he Pty. Ltd. Hobart & Launceston: Amalgamated Wireless (Australasia) Limited. may be compensating a deficiency in the original recording chain and actually restoring proper phase relationships. And what of the enthusiast who, per- Radio, Te/ev~~'on & Hobbies, June. 1964 A FULLY PROTECTED V w&r~~

~~IkM 20,000 OHMS/VOLT ViO'-/ "riST-BSii~~

~~MULTIMETER 0 PART TWO~~

as a VTVM-muItiplier combination, so that measurements made on the new instrument will have the same relevance .4 as those made with such a combination. In order to use the 990 Meg multiplier we have had to make the EHT range 0-60 KV instead of the more usual 0-30 KV, but we fee! that the slight decrease in reading convenience and accuracy is Last month we discussed the factors which caused us to embark upon more than offset by the improved avail- the description of a new protected multimeter, and discussed some ability, reduced cost and lower circuit of the desirable characteristics of a modern instrument of this type. loading. An inspection of Figure 1 will show This article continues the discussion, progressing to a descfiption of the how the various DC voltage ranges have various ranges provided on our new unit. The construction of the been provided. The diagram shows the instrument will be described in the third and concluding article, which basic voltage measuring circuitry abstract- will be presented in the next issue. ed from the main circuit. The protected meter circuit shown last month is connected to the input terminals By Jamleson Rowe via the appropriate multiplier resistance for each of the eight internal ranges. HAVING discussed the meter scales and the relationships between the various The meter resistance and diode protective ranges last month, let us now turn to the ranges themselves. How many and resistance are taken into account in the which ranges should the modern multimeter provide? calculation of the multiplier values. We will answer this question in parts, dealing with each type of measurement For EHT measurements the external in turn and seeing how our new instrument provides the desired ranges. probe is plugged into the closed-circuit Perhaps the ranges most often used in electronics are those mediating DC jack, disconnecting the rest of the cir- voltage measurement. We will accordingly deal with these ranges first. cuit. The protection circuitry is still con- DC voltage ranges having a full-scale span of from 10 to 1,000 volts arc neclcd — not so much to protect the sufficient to permit accurate measurements to be taken in the majority of valve meter during EHT measurements (for circuits. This span was that provided by our previous multimeters, which had 0-10V, 0-50V, 0-250V and 0-1,000V ranges. With our revised 3-1 range ratio, this means that our new instrument must have at least five ranges, to cover nv the same span—0-10V, 0-30V. 0-100V, 0-300V and 0-1,000V., ISK To make accurate measurements in transistor circuitry, -AV/- 6IK one should have voltage ranges considerably lower than the MAT ALSO BE USED FOR 0-10V range, however. For bias measurement, it is often -AW—MV- DIRECT CONNECTION desirable that voltages of the order of 100 millivolts be 200K TO PROTECTED METER read with accuracy. + -AW- With this in mind, we have provided no less than three O- 'VWV—' i I instrument provides three new low cur- 200K l i rent ranges—the basic 0-50uA of the IOOV l I meter itself, a 0-100 uA and a 0-300uA r 63K J ! range. Oov A Am ii i In circuits employing power transistors, currents larger than 250mA or cr 300mA are quite common, so that SS * I5K ranges higher than this would be quite \iIOV useful. However, the provision of such ranges may involve problems due to switch and terminal current ratings, etc. With our new instrument we have compromised by providing a single addi- MAY NEED ADJUSTMENT tional upper range—0-1 A. This extends FOR LiNfcAPISiNS the usefulness considerably yet keeps and or calibration terminal and switch requirements within reasonable bounds. There are thus 10 At left. Figure 2: The AC voltage 5x049/ ranges of the new instrument, again abstracted from the complete circuit. The two lowest ranges are com pen-. sated for rectifier non-linearity. Fig. A C. VOLTAGE RANGES 3, below; The current ranges, which are quite conventional. former tests, they often find use in audio 5Q|jA output and frequency response tests. J I oca" For general electronic work ranges f d 30(VA covering the span of 10-1000 volts are o quite sufficient, provided that a capacitor q I m A is fitted so that output measurements may — 3mA be made in circuits having DC voltages q I OmA present. Thus the basic requirement of _ our new instrument is that it have five HlOOmA ranges — 0-10V. 0-30V. 0-100V. 0-300V 100 mA T and 0-1000V, and an optional DC block- ing capacitor. As Figure 2 shows, the unit provides the five ranges and capacitor, and also adds a sixth range—3V. The additional range permits measurements to be made in transistor and other low impedance DIRECT CURRENT RANGES equipment. All AC voltage ranges use the same 0-10 and 0-3 scales used for nnoted here is that, in common with the direct current ranges in all, allowing the DC measurement. nmajority of multimeters intended for user to read any current between one Switch and circuit capacitance together eelectronic work, our new instrument microamp and one amp. with rectifier diode noise detection effects ddoes not provide alternating current The 50 microamp range is the only makes it impractical to use the full sen- r;ranges. one which cannot be read directly from sitivity on the meter on the AC voltage The AC ranges are omitted mainly the scale markings. For this scale the ranges. For this reason we have arranged tbecause they are rarely needed in most 0-10 numerals must be mentally multi- on AC volts for the meter to be shunted aapplications. Omitting them also lowers plied by five to give the actual current down to an effective sensitivity of one- tlthe cost of the instrument considerably value. This is a very easy task, and tenth that for DC volts — 2,000 ohms aas, to provide them, a rather costly cur- saves having to add another row of per volt. This sensitivity is still quite rrent transformer must normally be used. numerals to the scale to spoil its sim- adequate for the majority of AC voltage Should the user wish to make alter- plicity. measuring applications. nnating current measurements, there is no Note that two switch functions are Apart from lowering the sensitivity, rreason why an external current trans- used in current measurement—an input the shunting is arranged to allow for fformer and rectifier could not be used. switch and a meter switch. This is the 0.9-times average value-RMS value SSuch a combination would be connected necessary because if only a shunt ratio. This ratio normally necessitates tito the meter with the switches set to selector switch were used the resistance the use of either shortened AC scales, tlthe 0-1 mA DC range. of the switch contacts would be effective- non-standard multipliers or special Direct current ranges are, of course, ly in series with the shunt across the shunts for the DC ranges. a different matter, for there are many meter, and would make readings un- The two lowest ranges are linearity ooccasions when it is required to meas- reliable. Radio, Television & Hobbies, June, 1964 57 METRIMPEX PORTABLE TV TESTER TR.0809

~~lightweight - compact - tests every stage~~

Designed for servicing TV receivers the TR-0809 is a compact, light and portable unit which provides test facilities for every stage of a TV receiver. This instrument, which is of high accuracy, is suitable for use in fixed locations — laboratory and service sections — also in the field. The TR-0809 is housed in a metal case fitted with a leather carrying handle and finished in hammertone lacquer. A leather carrying case with shoulder strap is also supplied. Sections incorporated in the TR-0809;— HF Signal Generator (5.2Mc/s-220Mc/s) Valve ) DC: 50mV-1000 Volts (7 ranges) Pattern Generator with sync pulses Voltmeter ) 100V-20K.V with probe FM Intercarrier Generator (5.5, 6.5Mc/s) ) AC; 50mV-300V (6 ranges) RF Signal Generator (200Kc/s-6Mc/s) ) Resistance: 0.1 ohms- Crystal Oscillator (5Mc/s) ) 1000 Megohms (7 ranges) Audio Generator (1000 c/s) Mixer circuit for calibration and measurement

ACCESSORIES Assembled co-axial cable Mains Connector, 6 spare fuses Measuring Lead Leather carrying case with shoulder strap Balancing Transformer Operating Instructions H.T. Probe (up to 20KV) Soldering Iron (24V — plugs into unit) Ground Clamp Set of Tools (Screwdrivers, pliers, etc.) The accessories are stowed in a strong fabric holder which is housed in the leather case accom- modating the main equipment for transport purposes. This assembly thus makes a complete and convenient set-up for servicing in the field.

~~PRICE £135 F.LS. all capital cities with all accessories (plus tax).~~

~~JACOBY, MITCHELL & Co. Pty. Ltd. 469-475 KENT STREET, SYDNEY (MA8411) MELBOURNE ADELAIDE 15 ABBOTSFORD STREET. 77 WRIGHT STREET, NTH. MELBOURNE. 30-2491 ADELAIDE. LAS1)7~~

58 Radio, Television & Hobbies, June, 1964 By using the two switches, contact over a larger range in battery voltages resistance is prevented from having by varying the effective meter sensitivity appreciable effect upon readings. The rather than altering the total circuit re- resistance of the SI contact is external sistance. to test circuit, while that of S2 is in The adjustment range of the control series with the meter itself—where it has been deliberately restricted so that World-famous has far less effect because of the latter's the meter cannot be zeroed once the relatively high resistance. battery voltage has fallen below 0.8 of miniature The final ranges to be discussed are its nominal value. As battery voltages Soldering0 Instruments those concerned with resistance measure- below this level give readings having ^ ment. A thorough discussion of all the unacceptable error, restricting the con- aspects; of resistance measurement in trol range forces the user to replace the multimeters would be very lengthy, and battery before it degrades the accuracy is unfortunately out of the question here. All we can do is show the actual resis- Despite this restriction, it will prob- S l|MH tance measuring circuit of the new ably be found that battery life will not S /////////jv

~~«I0K- I l5V .1+ l.5.OK K-F 2x]N2858~~

~~I800> SOMA^N ? 2K(V~~

~~1N1764 W~~

FINAL RESISTANCE RANGES // NO SWITCH Figure 4: The resistance measuring ranges, including the small ISO-volt power // NECESSARY supply used for the highest range. Batteries can be used in place of the power supply but they will prove an expensive alternative. Note that a // WITH ORYX — shunt-type zero control is used to maintain greater accuracy with battery ageing. Highest range reads to 20 megohms. / The element is I rated for meter (Fig. 4) and briefly discuss where bbe very different from earlier multi- it differs from previous designs. nmeters. This is because the use of a 7 continuous There are six resistance ranges, as sishunt control extends the allowable I running, thus opposed to four on previous instruments, r;range of battery voltage for a given This extends the measuring range in the oorder of error. f avoiding switch upward direction so that high-value re- The four lowest ranges use a 1.5-volt troubles and sistors may be measured with ease. ccell, while the fifth range uses a small This will be of advantage particularly 115-volt photoflash battery. The highest warming-up delays. in television work, where high value re- r;range poses something of a problem, as sistors such as those in boosted HT it requires 150 volts. circuitry must be checked for drift in Although single dry batteries and value. The highest resistance range on bbattery combinations are available which the new instrument has a centre-scale pprovide this voltage, they are very costly 11 Weighs less than reading of 1.5 Megs., so that resistors aand have a shelf life which would make K 1 oz. yet does the work up to 20 Megs, may be checked quite hhigh resistance measurements (which are easily. nnot too frequent) work out at about of heavy irons. Long-life ele- The lowest range has a centre-scale 110/ a time! ment and replaceable bits reading of 15 ohms, and permits frac- Rather than suggest that constructors tions of an ohm to be read quite easily, uuse batteries for this range, we are sug- ensure years of service. Thus the total useful span of the six ggesting that they use the small regulated There's an ORYX designed resistance ranges is from a fraction of an ppower supply shown. Admittedly this ohm to 20 Megs. This is comparable meansn that the highest resistance range to meet your precise require- with the most elaborate commercial in- ccannot be used where the power mains ments. struments. aare unavailable, but this should be a A ustralian Uistrihntor.s The measuring circuit is basically that rminor disadvantage. of the series ohm-meter, with subsidiary And with that observation we must shunt standards on the three lowest tbring this article to a close. In the third MANUFACTURERS SPECIAL ranges. The zero adjustment control is aand concluding article we will describe PRODUCTS PTY. LTD. a shunt type rather than the usual series tthe complete instrument and its con- type which was fitted to previous units, sstruction. 47 York St. Sydney. 2 0233, Ext 279. The shunt control maintains accuracy (To be contimied) Radio, Television & Hobbies, June, 1964 FIRST AGAIN!

VOLTAGE DOUBLING TRANSFORMERS PRIMARY AC M.T. OC OUTPUT- L.T. 'FERGUSON, TYPE NO. VOLTS SECONDARIES VOLTS VOLTS mA ■ 2S0 120 310 n i PVDIOO TAP 240 TAP 110 OR 285 80 6.3V-3A C.T. Li ■ Lu " 230 " 100 " 240 250 145 380 A COMPLETE PVD101 TAP 240 TAP 135 OR 355 80 6.3V-4A C.T. " 230 " 125 " 330 RANGE OF 250 120 310 PVD102 TAP 240 TAP 110 OR 285 100 6.3V-4A C.T. " 230 100 " 240 250 150 380 VOLTAGE PVD103 TAP 240 TAP 140 OR 355 100 6.3V-5A C.T. " 230 " 130 " 330 250 120 310 6.3V-3A C.T. PVDS04 TAP 240 TAP 110 OR 285 125 4-3V-3A DOUBLER " 230 " 100 " 260 250 TAP 146 380 PVDIOS TAP 240 " 136 OR 355 125 6.3V-3A CT. POWER " 230 126 " 330 6.3V-3A 250 172 450 TRANSFORMERS PVD106 TAP 240 TAP 162 OR 425 125 6.3V-3A C.T. " 230 " 152 " 400 4.3V-3A 250 124 310 PVDlll TAP 240 TAP 114 OR 285 150 6.3V-3A C.T. " 230 " 104 " 240 6.3V-3A C.T. 250 146 380 PVD107 TAP 240 TAP 136 OR 335 ISO 6.3V-3A C.T. " 230 " 126 " 330 6.3V-3A 250 173 450 PVD108 TAP 240 TAP 143 OR 425 ISO 6.3V-3A C.T. " 230 " 153 " 400 6.3V-3A 250 146 380 PVD109 TAP 240 TAP 136 OR 355 180 6.3V-3A C.T. '* 230 . " 124 " 330 6.3V-4A ■ 1 250 193 500 PVD110 TAP 240 TAP 183 OR 475 200 6.3V-3A C.T. " 230 " 173 " 450 6.3V-4A. 'Volfogc i are for 2 X 100 M.F.D. capacifaton uting 2 lilicone diodei PTY. FERGUSON TRANSFORMERS LTD. 331 HIGH ST., CHAT5W00D, NSW. 400261 HEBOUBNE: A. H. Nicholls & Co., 22 Elizabeth St. East ADELAIDE: Wm. T. Matthew, 95 Grenfell Street Bentleigh XU4252 8 7021 BRISBANE: Keith Percy & Co. Pty. Ltd., Waterloo St. PERTH : Athol M. Hill, Durham House, 842 Hay St. Newstead. 2 1757 21 7861

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r Please send a Ferguson Catalogue to:— POST NAME ADDRESS TO-DAY! 60 Radio, Television i Hobbies, June, 1964 »r~m*

1£mt T&did Ckiwe*

in the detector itself can be amplified CHAPTER II: Limitations of simple receivers. to the point where it produces a continuous background hiss. And in mains- The RF amplifier stage, its operation and use. operated receivers, very slight 50-cycle Neutralisation and unilataralisation. Gain control of TRF receivers. or 100-cycle voltages, coupled into the detector circuit from heater and power The Superheterodyne principle, its operation and advantages. supply, can produce an audible hum Autodyne converters and modifications to the from the loudspeaker. Last, but not least, flight variations in basic superheterodyne receiver. high-tension supply voltage, caused by plate current variations in the output WHILE a beginner may concentrate of radio broadcasting, many domestic valve, can be fed back as a spurious initially on building small re- receivers were of tbjs general type. signal to the plate of the detector. If generative receivers of the type discussed For domestic use, however, such re- regenerative, this feedback can cause an in the last chapter, he must inevitably ceivers have certain basic limitations. effect called MOTOR-BOATING, evid- wonder about the design of larger re- In the first place, performance depends ent as a regular pop-pop-pop noise from ceivers. In this chapter, we explain the very largely on proper use of the re- the speaker. basic idea behind two well-known types action (regeneration) control. If it is too While all these problems can be mini- of receiver, the 'TRF" and the "super- far advanced, the set oscillates, produc- mised by careful design, they do set a heterodyne." ing whistles in its own loudspeaker and limit beyond which the detector-plus- In an article of feasible length, it is in neighbouring receivers tuned to the audio idea becomes rather impractical. not possible to discuss individual circuits same station. This limit was reached very early in in detail—the how and why of every If the reaction control is not suffi- the history of broadcasting, and de- resistor and capacitor. The reader will ciently advanced, perhaps to limit vol- signers had to find other means of im- have achieved something, however, if ume, selectivity is likely to suffer to proving the performance of their re- he can understand the general idea be- the point where two or more signals are ceivers. Since additional stages could hind these circuits, particularly the heard together. not be added after the detector, the superheterodyne. only alternative was to add stages Having grasped the basic idea. it HARD TO USE AHEAD of the detector and to amplify should be possible to enlarge upon it While this is no special problem to the incoming signal at its own frequency. later by studying the circuit and design anyone who understands what the con- Such stages were known as RADIO- information on actual receivers which trols are for and how they are sup- FREQUENCY AMPLIFIER stages or are described from time to time in these posed to be adjusted, it did prove an simply RF stages. pages. embarrassment in the early days for Now an ordinary valve will not am- The TRF and, later, the modern non-technical members of the house- plify radio freqeuncy signals very ef- superheterodyne receiver, came as a hold. Some less critical arrangement was fectively if merely coupled to the fol- natural development from the desire to obviously desirable for general use. lowing stage by a resistance-capacitance produce receivers which were more sen- Another difficulty with simple regene- network or by some kind of audio trans- sitive, more selective and more suitable rative sets lies in the fact that there is a former. for use by non-technical members of an practical limit to the amount of ampli- It will give a great deal more ampli- ordinary household. fication one can provide afer a detector. fication if coupled to the following stage Their story is really a continuation of Thus, while one or two audio stages by means of a circuit tuned to the in- the story told in the last chapter about can usefully increase gain and even coming signal frequency. small receivers and it must inevitably selectivity (the latter by roundabout Figure I shows the essential details read like a piece of radio history. means), anything more than this can of a TUNED RF AMPLIFIER. As we pointed out in the last chapter, lead to difficulty. The incoming signal is fed thorugh a receiver having a regenerative detec- Slight vibration in the detector valve, a tuned circuit to the grid of the RF tor followed by two audio stages is cap- causing slight changes in plate current, amplifier valve. This first coil, connected able of receiving a great many stations, can be amplified by subsequent stages to the aerial, is normally referred to as both on the broadcast and short-wave to produce what are known as MICRO- an AERIAL COIL. It is connected bands. PHONIC effects. Tapping the valve, or directly to the grid of the valve, with- By using a power valve or transistor even normal vibration, may produce out any capacitor or resistor, because in the final stage, such a set can operate thumps and ringing noises from the the valve is intended to operate as an a loudspeaker at good volume on the loudspeaker. amplifier, not as a detector. stronger stations and, in the early days Then again, noise due to electron flow For the same reason, it is provided

~~iVi~~

~~X >~~

Figure 1: The circuit of an RF amplifier stage using a Figure 2; The transistor equivalent to the circuit of Fig. triode valve. The connections for a pentode are shown 1. The transistor requires a base bias voltage divider and dotted. Input and output are both tuned. has a slightly rearranged output cicuit. Radio, Television & Hobbies, June, 1964 PEX

~~Fine-Line F-44 Series~~

~~PRECISION~~

~~Tape~~

~~Recorders~~

MODEL F4453 mounted in a walnut cabinet. Speeds 3% & 7i2 IPS. Frequency Response: 3% IPS; 50-10,000 a: 2 db, 7"2 IPS; 50-15,000 — 2 db. Signal-to-noise Ratio; 48 db at 334 IPS. 50 db at 7V2 IPS. Wow & Flutter; Under .2% at 3% and 7V2 IPS. Output 1 V. from Cathode follower. Universal voltage: 105 V. to 260 V.. 50 cycles. Dimensions 13" x 15" x 71/2". Weight 36 lbs.

A 4-track stereophonic and monophonic recorder/player priced for home use with performance characteristics to meet professional standards. Plays 4-track stereo tapes PORTABLE MODEL and monophonic tapes (full, half and quarter-track). Records 4-track stereo and monophonic tapes. MODEL F4463 the basic tape deck which mounts into a specially built luggage case lor portable use. Deck can be removed from FEATURES: "Fine-Line" alignment of tape from reel to case for use with built-in system. Specification reel—micro-milled, die-cast frame—professional recorder as for F4453. electronics — separate narrow track erase, record and play-back head—master selector switch. ADVANTAGES: Rugged frame and precision positioning of all tape tracking guides on this frame assure finer alignment of tape past narrow track heads. The result For turthef particulars please contact —inter-channel and bass rumble cross-talk eliminated, Engineering Products Division: frequency response and signal-to-noise ratio improved. AMALGAMATED WIRELESS Separate dual-channel record and play-back electronics (AUSTRALASIA) LIMITED provide greater fidelity for recording and reproduction. 47 YORK ST.. SYDNEY. 2-0233 Master selector switch, selective erase head. 2-stage EXT. 253 automatic shut-off. precision recording level meter and tape counter all assure greater control—easier switching MELBOURNE BRISBANE PERTH HOBART 67-9141 ■1-1631 28-3426 3-3836 from mono to stereo—simplified operation on record and LAUNCESION ADELAIDE WELLINGTON. N Z play-back. 2-1604 51-0111 43-191

62 Radio, Television & Hobbies, June, 1964 with the cathode (or grid) bias necessary matter a great deal, but in RF stages, lowed the pattern shown in the block to ensure operation as a class A ampli- with both grid and plate circuits tuned schematic diagram of figure 4. fier. to the one frequency, the feedback tend- Before we discuss this diagram, bow- Signal output current from the plate ed to cause oscillation. One low-gain ever, it should be noted that the principle circuit flows through the primary wind- triode RF stage was practicable (even if of neutralisation has been given a new ing of a second coil assembly, and is barely so) but two such stages were al- and important application of late—in coupled into a tuned secondary winding, most unmanageable. transistor receiver RF (and as we shall the two windings forming what is com- A temporary answer to the problem see, IF) amplifier stages. It has proved monly referred to as an RF COIL or was found in the so-called "Neutrodyne" worthwhile to use neutralisation in RF TRANSFORMER. principle, which enjoyed some popularity many transistor tuned amplifier stages, The two secondary windings, with in the late twenties. The basic idea is because the transistor is very similar to their associated capacitors, must be cap- shown in Figure 3(a). the triode valve in that it has collector- able of tuning over the entire broadcast The primary winding of the RF coil ''ase feedback capacitance, band. To receive any given station, both was centre-tapped so that a signal volt- As may be seen in figure 3(b), the tuned circuits should be set to the fre- age appeared at the lower end similar neutralisation system used with many quency of that station. to but out-of-phase with the signal volt- transistor amplifiers is very similar to Under these conditions, the signal age at the plate end. A small variable that used with triode valves. The only from the desired station is selected and capacitor was connected from the lower difference is that quite often it is possible passed to the RF amplifier grid, in pre- end of the primary ference to other singals which may be to grid and adjusted " ———————— present. It is amplified by the RF am- to have the same plifier valve and passed through the value as the grid- second tuned circuit, which also favours plate capacitance of f aLA the desired signal and tends to reject the value. _ | I signals on other frequencies. Being connected T ' I " I / T In other words, the use of a tuned in this fashion, this c> J 2 _L RF stage not only provides amplffica- so-called NEU- L g i \G/ K S £ tion, but it also increases selectivity. TRALISING capaci. o) o | ■ o< o I This was—and Is—a most important tor fed back to the r S 1 ' *[1 i__r S__l point. grid a signal equal J. X | X An RF amplifier stage employing a to and out-of-phase ~ 1 transistor is very similar to the valve with that fed back +' type, as may be seen from the circuit from the plate, so (a] of figure 2. The differences between this that the two cancel- xrrv circuit and that of figure 1 are due to led out. As a re- > ' ____ —T_ the rather lower impedances of the tran- suit, the tendency to T 1 ~ sistor, making it necessary to tap the oscillation was over- i X base and collector across only part of come and two triode J | X o their respective coils, and to reverse the RF amplifier stages (c, T *? (_ ' B role of the two RF coil windings. There became practical. o J. r~ 2 is also the need to supply the base of The early "Neu- J ~ ~ f*, y ».base the transistor with forward bias from trodyne" receivers <3 o \ the resistive voltage divider comprising were, therefore a J S . . WINDING R1 and R2. Cb and Ce are bypass capa- special type of TRF X. 'It < arranged citors, effectively earthing the lower end receiver, employing " S 5; -v T TO give of the coil and the emitter as far as the the principle of neu- "5 T -i- . OPPOSITE radio frequency signals are concerned. tralisation. that at Since an RF amplifier stage feeds into In point of fact, > N.C. R I COLLECTOR a circuit tuned to the signal frequency, neutralised TRF re- ^ this is the only frequency which it can ceivers did not en- 3 - lb) — amplify properly. Because there is no joy a lengthy period load resistor in the plate or collector of popularity be- Figure 3: The application of neutralisation feedback to circuit and no audio transformer, it can- cause vaWe de- valve and transistor RF amplifiers. The neutralisation not amplify or pass on signals within signers came to light feedback cancels the internal feedback of the triode and the audio range. Therefore, it is not transistor, to give stable and improved amplification. nearly as susceptible as an audio stage to with the screen-grid transistor, to give stable and improved amplification. hum, hiss, microphony or motor-boating. principle. Applied This, too, is important. in RF tetrodes and pentode valves, to arrange that the RF transformer Many early receivers used one triode it almost eliminated grid-plate capaci- secondary winding provides a suitable RF amplifier stage, a regenerative de- tance, and therefore, eliminated the out-of-phase voltage to which the tector and two audio stages. There were major source of instability in RF stages, neutralisation capacitor NC can be con- the first "TRF" receivers, the letters in- As a result, it became possible to nected. This makes it unnecessary to dicating the use of a tuned radio fre- achieve high figures of stage gain, and, add special windings or extensions to quency amplifier stage. further, to use two high-gain stages in windings. Such receivers were generally better sequence. Nor was there any great f" addition to capacitance, transistors than earlier types without the RF stage. trouble with instability. By shielding the also, have a collector-base feedback They had better gain and selectivity valves and coils and adopting a layout RESISTANCE which can upset the and therefore relied too a lesser extent which kept input and output leads reas- amplification of a tuned amplifier. How- on critical setting of the reaction con- onably apart, such a set could remain e^r.er' 11.18 possible effectively to cancel completely stable, even under full gain '"'s resistance along with the feedback trol. And because there was an amplifier capacitance by wiring a resistor R stage between the detector and the aerial, conditions. . i ui -j .k (shown dotted) of suitable value in series the reaction setting was not affected so With such gam available and the se e^ with lhe neutraIising capaCitor. This much by the type of aerial in use. tivity afforded by three tuned cir u ts, more elaborate form of neutralising is For all that, the basic problem re- reaction became unnecessary and the called UNiLATERALISATION. As it mained that there was still a reaction familiar reaction control therefore large- of S • onl a inal improVement control to set, and attempts were made ly disappeared from se s of 4the day over 0 rdinary neutralisation, unilateralis- to produce, receivers with two RF am- By carefully match "8 " ng ation is often not attempted in receivers, and adding TRIMMER capacitors across , f nance is required plifier stages ahead of the detector, but zi r» V* *>mnH i— i 111 vi/#1 anlf he b per on with no reaction. each tuned circuit, designers were able irrespective of complication. Here designers came up against the to gang together the three tuning capaci- full measure of a problem which was tors and operate them from a single Let us now return to the block diagram mentioned in Chapter 6 of this series. tuning dial. This done, domestic re- of early valve TRF receivers shown in They found that, because plate and grid ceivers became really simple to operate figure 4. , . , , in a triode were side by side, there was for the first time—one dial to select the The incoming signal was fed by the considerable capacitance between them station and one knob to control the aerial to the first RF amplifier stage, and energy was being fed back from volume t'len Passec' 'o the second Rr amplifier plate to grid as a result. JRF receivers reached their heyday stage and thence lo the detector. This In detector or audio service it did not about 1930 and their general design fol- was followed by a single audio stage. Radio, Television & Hobbies, June, 1964 m i!

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Radio, Television & Hobbies, June. 1964 but, using a sensitive pentode valve, niques, the superhet receiver quickly quency components in the output, due to which gave high amplification as well established itself in popular favour, and the presence or generation of harmonics, as ample power output to operate a loud- has remained in undisputed leadership but we can afford to neglect these as be- speaker. ever since. ing incidental to the main effect. Power to operate all these stages But how does the superhet work? At As we already know, stations on the came, in mains receivers, anyway, from this point, we can drop the semi-histori- broadcast band transmit on allotted fre- a power supply built on to the same cal sort of discussion and settle down to quencies between the limits of 550 and chassis. This included a power trans- some straight theory. This is appropri- 1,600 Kc/s. To tune and amplify them former, a rectifier, a filter choke of ate, because the superhet principle does on a TRF receiver involves the use of a some description and two or more filter not yet belong to history. Practically ganged capacitor tuning two or three capacitors. every modern broadcast, communication matched coils. The volume control in such receivers and television receiver uses the principle, There are difficulties in the way of usually took the form of a potentio- including those using transistors. tuning more than about three coils in meter connected at one end to the two As the name suggests, the superhetero- this way, so that the performance of a RF amplifier cathodes, and at the other dyne receiver utilises a method of hetero- TRF receiver is largely limited by the selectivity and gain which can be achieved with three variable tuned circuits. But, in the superheterodyne, the designers utilise the heterodyne principle to change the frequency of any and every FIRST SECOND DET- AUDIO desired incoming signal to a new, pre- RF AMP ECTOR POWER arranged and fixed frequency. This is RF AMP AMP. passed to and amplified in a section of the receiver, which can employ a greater number of fixed tuned circuits. The new frequency is usually lower T VOLUME than the signal frequency but still well POWER SUPPLY above the audio spectrum, which is per- CONTROL AND RECTIFIER haps the reason why it is commonly referred to as the "Intermediate" frequency — shortened to "IF." ,iC a nt te Figure 4: The block diagram of an early TRF receiver using valves and two . ^t^H Kv Jhi H^onir8 . RF amplifier stages. The yolumo control alters the bias on the RF stages and ^ rements ,f hi h ain and extreme also acts as a yar.able shunt across the aenal e.reu.t, selectivity is the object he may choose to the aerial terminal. The adjustable dyning or beating two signals together, jn intermediate frequency of about 200 tapping went to earth. Let's explain this. Kc/s. But with such a low frequency. With the moving arm towards the It has been found that, when two great care has to be exercised to avoid cathode end, the RF amplifier valves signals are fed into a non-linear cir- receiving the same signal at two pc nts operated with minimum bias and maxi- cult, they combine to produce signal on . the dial called two-spotlmg' • mum gain, while the amount of resist- voltages at frequencies additional to owing to unwanted heterodyne effects, ance between aerial, and earth was too and distinct from either of the An intermediate frequency of more high to make any real difference to its original input frequencies. Further, like 2,000 Kc/s minimises double-spot- efficiency. Adjusting the control the that these new frequencies are equal ting, but requires greater attention to the other way applied high bias to the RF. to the sum and the difference of the design of the tuned circuits, if gain and amplifier cathode and reduced the stage original frequencies. selectivity are not to be sacrified. gain; at the same time it shunted the Consider, for example, two frequencies A compromise figure, which is aerial to ground and therefore reduced which we shall designate as fl and f2. widely employed in this country, is the signal input. It might be thought that the evolution of this standard kind of TRF receiver would have largely halted receiver development in that it provided good gain and selectivity with plenty of acoustic output and simplicity of operation. I.F. AUDIO DET- POWER But it didn't. AMP ECTOR AMP. About the same time, .many new stations were coming on the air, crowd- ing the broadcast band and ever increasing the demand for selectivity. The POWER SUPPLY limitations of the simple TRF soon be- OSC- AND RECTIFIER came apparent, particularly for the more ILLATOR difficult reception areas. (OR BATTERY) To add yet another RF stage or yet another tuning circuit gave only limited improvement at the cost of much greater Figure 5: The block'diagram of a superheterodyne receiver. Most modern complexity and with the attendant risk receivers, both valve and transistorised, are of this type. The more sensitive of instability. What was more there designs have an RF stage between the aerial and the mixer to improve the didn't seem to be any obvious way of sensitivity, selectivity and noise performance. making tuned circuits much more efficient. To resort again to reaction If fed into a non-linear amplifying stage, an intermediate frequency of 455 as an aid to selectivity was unthinkable it would be possible to detect output volt- Kc/s or thereabouts, to a commercial designer. ages, as expected, having the original Assume that a desired signal is on As a result, they began to look for frequencies fl and f2. But, in adition, 1.000 Kc/s. The first obvious require- other basic methods of receiver design, we would find that output voltages were ment then, is for the tuned aerial input and the one which seemed to hold the present at frequencies equal to fl-plus-f2, circuit to be resonated to this figure. This greatest promise was the superheterodyne and fl-minus-f2 (assuming fl to be the is accomplished by tuning the aerial in- principle. This was not new. having higher numerical value). put coil with a variable capacitor, exact- been employed, in a limited way, for Taking an actual case, we may feed ly as in an ordinary TRF receiver, many years. But with new valves and signal voltages at, say, 2,000 and 1,500 The desired 1,000 Kc/s signal is then new methods it might be capable of Kilocycles into a non-linear stage. Both fed into the "mixer" or "frequency chan- transformation from a very cumbersome original signal frequencies would be pre- ger" valve. In the output, remember, one system to something much more manage- sent in the output, plus additional fre- desires a frequency equal to the selected able. This, indeed, proved to be the case, quencies of 3,500 Kc/s (2,000 plus 1,500) intermediate frequency, which one may Designed around the better valves and 500 Kc/s (2,000 minus 1,500). assume to be 455 Kc/s. available, and using modern circuit tech- In actual fact, there may be other fre- Essential for the frequency change is Radio, Television & Hobbies, June, 1964 6S Make no mistake! Heath test gear is indeed the world's finest yet it comes to you at surprisingly low cost because of the modern and economical production methods which are employed! And, because it's in kit form, you save still more by assembling yourself! Heathkits are as easy to buy as to build — all may be purchased on low deposit and easy weekly payments from WF OR by taking advantage of WF's convenient "ADD ON PURCHASE PLAN!" For full details contact your nearest WF office!

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Produce up to one billion different R/C combinations with these new Heathkit Decades and Substitution Boxes. 3-DECADE CONDENSER 6-DECADE RESISTANCE KIT (IN-11) Precision accuracy in this laboratory-type Designed for laboratory use, this extremely ac- capacitance decade provides convenient curate resistance decade will provide any re- switch-selection of capacitor values from sistance value from 1 ohm to 999,999 ohms. You can add or subtract as little as 1 ohm in critical Ideal for use in substitution tests, tuned circuits with i of one per cent, accuracy! circuits, bridge circuits, filter networks Valuable for laboratory applications such as 1 and many more applications where a multiplier, shunt, substitution resistor, or as an arm for AC and DC bridges. Ideal for tant ,en l 15 asler an< eas er ,0 use with the IN-21 capacitance decade where ^ ' f ' ' an extremely wide range of values are necessary using the IN-21 than to make cal- for making resistance and capacitance networks. culations. The 1N-2I uses precision one per cent, silver mica capacitors rated Range switches have make-before-break action at 350 volts DC continuous; 500 volts DC intermittent; and 1000 volts DC test. for smooth switching without opening or short- High quality ceramic wafer switches have positive detent action. Price £17/19/- ing the circuit. Price £25/8/-

HEATHKIT RESISTANCE SH^heathkit condenser substitution SUBSTITUTION BOX K^SggV BOX KIT (iN22) Radio and TV technicians Using silver-mica and plastic moulded tubular type condensers, the IN22 provides convenient selection of individual substitution values. An 18- determining desirable re- position panel switch provides individual selection sistance values and for al- > of any one of 18 RTMA standard condenser values tering circuit operating characteristics quickly and ranging from 0.0001 mfd to 0.22 mfd. All capacity values are rated at easily. The IN 12 provides convenient switch selection of any one of 36 RTMA I-watt standard 10% 600 volts with the exception of the three largest which arc 400 volts. resistors ranging from 15 ohms to 10 megohms. Measures 5il in. L x 3i in. W x 3 in. H. Flexible 18 in. leads with The attractive bakelile cabinet measures 5iJ in. alligator clips furnished. Price £5/12/* L x 3(1 in. W x 3 in. H. Price £6/1/- are delivered FREE in the metropolitan areas of Adelaide, Brisbane, Melbourne, MAIL ORDERS Sydney and Perth. Send your cheque or money order to your nearest WF office.

SYDNEY; 307 K«nt St. 25-1111. NEWCASTLE-WEST: 854 Hunter St. 61-4077. WOLLONGONG; 60 Keira St. 2-5444 ADELAIDE: 204 Flinder, St 6-1711. BRIS- BANE: 13 Chester St., Fortitude Valley 5I-SI2I MELBOURNE: 355 Lonsdele St, 47-8351. PERTH: ^ WARBURTON FRANKI Touqh Instrument Service Co., 553 Hay St. 21-5747. HOBART AND LAUNCESTON: Associated Agencies Ply, Ltd. Radio, Television & Hobbies, June, 1964 an oscillator valve, which delivers a are fully effective in discriminating locally generated signal voltage to the against unwanted signals. mixer stage. To obtain the desired result, For example the desired signal may the oscillator would be tuned to 1,455 be on 1,000 Kc/s with an adjacent and Kc/s — a frequency higher than the in- interfering signal of 1,010 Kc/s. The coming signal frequency by just 455 single tuned circuit ahead of the mixer Kc/s. valve could not discriminate effectively At the output of the mixer stage, one against a signal only 10 Kc/s removed would expect frequency components from the desired one, so that a substan- of 1,000, 1,455, 2,455 and 455 Kc/s. But tial 1,010 Kc/s signal may reach the the mixer valve plate invariably feeds input of the mixer valve. directly into a tuned circuit, which would In the output of the latter, there be resonated permanently at 455 Kc/s. would, therefore, be the desired TW30: Latest and world's best Twin 12- This one frequency is, therefore, selected heterodyne frequency of 455 Kc/s, plus watt all-transistor. 240V.A.C. and 12- and passed on, while the first three men- another heterodyne produced by the un- 18V-D.C. PRE-MAIN AMPLIFIER, i tioned above, together with all other wanted carrier at 445 Kc/s. But, with I £122 incidental harmonic frequencies, are four or more circuits to negotiate, all | W45A! Twin 18-watt pre-main stereo- suppressed. tuned to 455 Kc/s, the signal on 445 mono deluxe amplifier with all tape and If the desired signal were on 1,020 Kc/s would have little chance of reach- other attachments £96/10/- Kc/s, then it would be necessary to in- ing the detector at troublesome level. 1W38: AM/AM/FM SW Twin 14-watt crease the local oscillator frequency by Thus, even though the average pre-main amplifier-tuner with all attach- another 20 Kc/s to ensure the output at domestic supcrhet uses only a two- ments £129 455 Kc/s. , gang tuning capacitor, there are IW50: AM/AM FM SW Twin 24.watt Thus, in a simple snpcrhet, there actually five tuned circuits to dis- • pre-main amplifier-tuner with all attach- are two variable tuned circuits. One criminate against unwanted signals— ments and refinements £176 gives initial selection at the signal as against two tuned circuits provided IW24: Twin 10-watt push-pull stereo- frequency, and the other adjusts the by a two-gang capacitor In the TRF I amplifier £58 local oscillator frequency to a figure arrangement. which differs from the signal fre- The double-tuned IF transformers quency by the selected intermediate provide higher gain and efficiency into frequency. the bargain, and their isolation from one In the earliest "superhets" the aerial another adds greatly to the flexibility of and oscillator circuits were controlled by the individual circuits. separate capacitors and tuning dials. But, Another reason for improved selec- Bookshelf Speakers, 20" x 111" x 7" in all modem sets, the coils are accur- tivity in the superhet is the basic fact Response 40-16,000 with 25-wali R.M.S. ately adjusted and the oscilator tuned that the frequency is changed to a lower power. Handling without break-up 16 circuit provided with a "padder" capaci- value. As shown in the example above, ohms . £75 the difference in frequency between "Auditorium" floor type, ,16" x 70" x 8" tance, so that they maintain the required Response 30-16,000 with up to 60-watl frequency difference automatically. the wanted and unwanted station—10 R.M.S. power handling without break-up Alternatively, a ganged capacitor hav- Kc/s in this case—is retained when the 4, 8, 16 ohms £230 ing specially-shaped and smaller rotor frequency is changed. However, relative STA 15 Amplifier £116 plates on the oscillator section is used. to 455 Kc/s, 10 Kc/s is a greater change, Control unit £78 Such a capacitor is called a "padderless" in terms of percentage, than is the same gang, as the padder capacitor is no change relative to 1000 Kc/s. Thus, assuming tuned circuits of equiv- longer required. IX C C11 Speakers: With either method, turning the one alent "Q", the one at 455 Kc/s will be H. I^ELV "Celeste" better able to reject the unwanted signal model. dial selects the desired input signal and Compact, maintains the required frequency differ- than the one at 1000 Kc/s. It will also 18" x 103" ence between the signal and oscillator be understood why some circuits use x 63", 241b, 15 ohms, 15 watts and 30 tuning circuits. even lower frequencies, 175 Kc/s and watts peak, Bass Unit. Flux 10,500 with The new intermediate frequency gen- even 50 Kc/s being employed where total flux 137,000, Maxwells H.F. unit erated at 455 Kc/s from the broadcast very high selectivity is required. 15,000 and 53,500 Maxwells. Capable1 carrier retains the original modulation, The output from the IF amplifier stage of extremely High Frequencies. Bass so that it can be amplified and passed on ultimately feeds into a detector, which Driver in this small enclosure is very to the detector in the usual way. may be any one of several varieties. The smooth from 600 down to 40 eyes. 62gn.. It is here that the advantage of the output and power supply arrangements superheterodyne principle becomes evi- are exactly as for a THF receiver. SPECIAL dent. Since each selected signal is auto- Figure 5 shows the sequence of stages Local enclosure for Floor or Book- matically transformed to a constant in a typical superhet in block schematic shelf 24in x 15in x lOin with Celeste frequency (which we have assumed to be form. The aerial input signal is fed to Tweeter and Bass Driver Response 455 Kc/s), the IF amplifier channel may the mixer or frequency changing stage, smooth down to 30 eyes. Tweeter be provided with any desired number of where it is mixed with a signal generated above 16,000, complete . . £80/5/ circuits, permanently tuned to the by the in-built oscillator. selected intermediate frequency. The resultant or intermediate fre- Celeste Tweeters £16/18/6 Coupling coils between valves may quency is then amplified in the IF stage Celeste Drivers £29/13/4] have both primary and secondary tuned, and passed on to the detector, where K1 Baffles, complete £75 instead of the secondaries only, as in the audio component is extracted. This Dual 1009 Turntables, ordinary TRF practice. No variable tun- is amplified in the audio stage and ap- from £47/15/- ing gang is necessary for this purpose, plied to the loudspeaker. and the coils may be designed for com- At first, the functions of mixer and All brands speakers, pickups, pactness and efficiency, and thoroughly oscillator were entirely separate, as indi- turntables, cabinets available. shielded for stability. cated in Figure 4. Intermediate frequency (IF) tuning The oscillator, generally a triode. oc- Write, phone or call for circuits are frequently resonated by cupied an appropriate position on the quotation or demonstration. J' means of small compression type mica chassis, with its associated components. 6RAHDECK TAPERECORDERS £24/10/- | trimmers, adjusted with a screwdriver. In the absence of other specialised Alternative and common practice nowa- types, the mixer valve was a triode and days is to have a fixed mica or ceramic later a tetrode or pentode, when these tuning capacitor and to vary the induct- became available. ASDIC STEREO SPECIALTY ance of the coil by a small adjustable The mixer was normally operated iron core. under very high bias conditions, as em- 166 GLEBE ROAD, GLEBE, K.S.W. Most ordinary superhets employ one ployed for a detector. Hence, the mixer TEL MW1014 stage of IF amplification, involving two valve in these early superhets. was com- double-tuned IF transformers — and, monly referred to as the "first detector." therefore, four tuned circuits. Larger sets The normal detector for demodulation BRISBANE AGEHCIES may use two IF amplifier valves or tran- naturally gained the title of "second- 16 CTAKLEY STREET, SOUTH BRISBANE, sistors with three IF transformers, and, detector." therefore, six tuned circuits. In the inevitable trend to simplifica- QUEENSLAND, TEL 4-5466 These tuned circuits in the IF channel tion, it was found possible to obviate the Radio, Television & Hobbies, June, 7964 MULTIMETER CT500 popular models Specifications

from a 0C/V: 2.5V 10V 50V 250V 500V 5D00V (20,00rVV) range of 7 AC/V: 10V 50V 250V 500V 1000V (10,000!VV) DC/A: 5/iA 5mA 50mA 500mA OHM: O-m!-' 0-1201(0 0-1.2MO 0-12MO Scale Centre: 600 BOOH Bk'-' BOkO db: - 20 db to + 62 db (5 ranges) Battery.- Internal 1.5V x 2 Appro*. Size: SVV * 3%" * W

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DC/V: 5V 25V 50V 250V 500V 2500V (201000!-'/V) AC/V; 10V 50V 100V 500V 1000V Peak multimeters are available for the reading of (10,000! VV) T V AC and DC voltages from a range of 0.25 volts to '• V ' OC/A; 50/iA 2.5mA 250mA 5kV. In strong and durable moulded cases they OHM: 0-60KS.' 0-6M

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68 Radio, Television & Hobbies, June, 1964 separate oscillator valve, and the first detector was made simultaneously to fulfil the function of oscillator by connecting it to the oscillator tuned circuit. This arrangement, employing general- BY THE SOUND OF IT... ly the 57 or 6C6 pentode, was widely used around 1932. Known as the "autodyne" circuit, it proved quite efficient and adequate until the demand for dual- it s best to choose nmnm wave sets emphasised its non-suitability for such receivers. Ultimately, the trend to superhet. circuits, the popularity of dual-wave receivers and adoption of automatic volume control, led to the evolution of special valves for use as frequency "DERAM" CARTRIDGE changers. I'l 'X, iKi The revolutionary Decca These vary a good deal in structure "Deram" ceramic cartridge is from one type to the next, but normally fitted with a diamond stylus for have a triode oscillator and a screen- Price: Autochange, £5/5/-* stereo or mono records. Trans- grid mixer section within the one en- Price; Transcription, £6/6/-* cription or Autochange models. velope. For all intents and purposes, they are treated as a single valve. With the advent of transistors, the autodyne principle has been revived with the first transistor acting as both local oscillator and mixer. It is also commonplace in valve circuits to have one or two diode elements, DECCA "DERAM" UNIVERSAL TRANSCRIPTION ARM serving as detector, in the same envelope as the IF amplifier or audio power valve. Specially designed for the "Deram" cartridges, Because of such economies and other this arm will improve the performance of many circuit developments, it is now possible other pick-up heads. Precision construction, to make perfectly serviceable domestic viscous damped. Price: Arm only. £8/19/6* superhet. receivers incorporating only four valves in all: Frequency-changer, IF amplifier and detector, output valve, rectifier. Receivers intended for specialised communication work invariably use the superhet principle, because of the high gain and high selectivity which it offers. DECCA PROFESSIONAL STEREOPHONIC PICK-UP In such case, economy is of only secondary importance and it is com- Th is model combines the ffss Mark II stereo monplace to use two or even three head and the professional arm. It is the latest intermediate frequency stages. These refinement of a design that has established can be arranged to give high overall itself as the world's finest. Price: Complete, £50/3/9* pain and the high selectivity necessary to separate weak individual signals coming from distant transmitters. Many such receivers, in fact, use what is known as a "crystal filter" in the IF amplifier to achieve extreme degrees of selectivity. The heart of the circuit is a quartz crystal ground to resonate mech- DECCA "DERAM" ANTI-RUMBLE INTEGRATED PICK-UP anically at the intermediate frequency. A sensational development in pick-up design, The provision of this and other faci- the AR1 arm achieves automatic attenuation of lities at the fixed intermediate frequency motor rumble. Supplied with the transcription is something which could not reasonably stereo head, the ARI arm will accommodate be duplicated in any TRF design. the other Deram pick-up heads. Price: Complete. £15/5/6* At the same time, most high performance superhet receivers do use at least DECCA one RF amplifier stage ahead of the frequency changer. STYLUS An RF stage ahead of a superhet circuit makes a minor contribution to CLEANER gain and selectivity and also helps ex- clude from the frequency changer strong Suitable for use signals at frequencies remote from with any pick-up: the desired station. In special circum- helps to keep re- stances such signals may cause spurious cords and stylus in beats with harmonics of the local oscil- excellent condition. lator and penetrate the IF channel. Price: £1/11/3* The main advantage of an RF stage however, is that it has a lower inherent DECCA MICROLIFT noise level than a frequency changer. Fit a Microlift and avoid damage to stylus and By amplifying the incoming signal some- records. Gently and accurately the Microlift Write for free des- what before its frequency is changed, a lowers the stylus onto the record at any point criptive literature more favourable signal-to-noise ratio can you choose . . . and just as gently lifts it clear. and name of your be obtained. nearest Decca Dis- Modern television receivers also use Price; £2/3/3* tributor who will the superhet principle. The problem in Sole Australian Agent: gladly demonstrate this case is not to get extreme selectivity this equipment. but a specific amount of selectivity— BRITISH MERCHANDISING no more and no less. To meet this re- m. LTD. quirement in the variable tuned circuits Retail prices throughout of a TRF would be very difficult but in 60 Clarence Street, Sydney. Telephone 29-1571 VV Australia; effective 1/4/64 the IF channel of a superhet it can be provided without any special difficulty. I Radio, Television & Hobbies, June, 1964 A READER BUILT U!

~~Circuits and devices which we have not actually tested in our laboratory but published for the general interest of beginners and experimenters.~~

~~TWO-MANUAL VERSION OF ELECTRONIC ORGAN~~

Although the supply of components for the Strom- berg Playmaster electronic organ has been inter- I , ^ ft 4 rupted by liquidation of Stromberg-Carlson (A'sia), interest In the design still persists. From a reader at Traralgon, Victoria comes information and pictures of a two-manual version, which he constructed some time ago. The information is reproduced herewith for the guidance of those who •Jft h may want to build or modify such an organ, supply problems notwithstanding.

THE reader in question is Mr N. V. Teychenne, of 20 High Street, Traralgon. Victoria. The articles on which he based his design appeared in this magazine from Novem- ber, 1961, to June. 1962, inclusive, with supplementary information in August, 1962. and May, 1963. Describing the project, Mr Teychenne writes;

~~■ ■ ) . i :~~

•ar* w W\ Xk l v m \ "I have been a constant reader of Pictured above is the arqan constructed by Mr Teychenne. The two gener- 'R., TV and H.' since about 1940 and ators tit one above the other, the height of the cabinet being increased from time to time, have built some of slightly to accommodate them. The tone filter system and voicing tabs are your projects. Of these, by far the most above the upper manual, the filter components being attached to tagboards interesting to me, personally, was the and interconnected with busbars. The manuals are staggered by one octave. series on the Stromberg-Playmaster Electronic Organ. "1 had been toying for a long time with the idea of building an electronic organ, but was not game to start. Need- less to say, after reading the first of the series on this particular design, I could not start fast enough. "I decided to build a two-manual unit, using the basic Stromberg-Carlson parts. This I have done, using a separate set of oscillators for each manual. "The bottom manual I have left as a standard unit, and, by working out a chart of components (mainly by trial and error) for the top manual oscillators, I was able to produce each note one octave higher, using the normal set of chokes. 1 have enclosed a copy of the chart." This is a sample sector of the control channel, showing a tab and spring, the [EDITOR'S NOTE: With the system contacts and a couple of filter components mounted on tagstrip, resting in of oscillators used in the Stromberg- vertical sawcuts. This was all made from scrap materials.

Hadio, Television & Hobbies, June, 1964 Playmastcr organ separate tone genera- KEY C C C C C C R tors are virtually necessary for each No. Name Osc 201 203 204 205 206 207 207 manual. Sharing the one set of oscilla- _ _ tors would involve serious difficulties and compromises. 48 E 16 .001 .0022 .0047 390 82 180 330K Commercial organs equivalent to that 47 D# constructed by Mr Teychenne appear to 46 D favour oscillators of the same basic 45 Cff 15 .001 .0022 .0047 470 82 180 330K footage for both manuals. One has two 44 C long keyboards with no relative offset. 43 B Others have two shorter keyboards (37 42 A# 14 .0015 ! .0033 .0068 680 82 220 330K or 44 note), some keys and oscillators 41 A simply being omitted from the bass end 40 6# of the top manual and the treble end of 39 G 13 .0015 .0039 I .0082 750 180 300 270K the bottom manual. The idea of stag- 38 Fff gering two 48-nofe manuals and raising 37 F the coverage of the upper manual by 36 E 12 .0022 .0068 .0082 .001 180 680 270K one octave may or may not appeal.] 35 "The output from each set of oscilla- 34 D . tors goes to separate banks of filters and 33 C#ll .0022 | .0082 .01 .0012 470 560 220K is then mixed through a manual balance 32 C switch, similar to the solo switch in the standard single-manual organ. 31 B 30 A#*- 10 .0056 .01 .01 .0015 .00075 .0018 220K "The stop tabs and switches were 29 A made from scrap radio cabinets, piano movements, etc, A sample switch is 28 G"S enclosed. Behind each switch I fitted a 27 G 9 YELLOW .0047 .012 .012 .0018 .00075 .0015 180K small oblong piece of matrix board on 26 Fff edge, on which each filter circuit is 25 F wired. Running the full length of the 24 E 8 YELLOW .0047 .015 ,015 .0022 .00082 .0015 180K bank of filters, but under the filter 23 D* boards, are the busbars from the Com- 22 D plex line, Flute line, Earth, and Output 21 C* 7 YELLOW .0062 .015 .015 .0022 .001 .0025 150K from the filters, so that each filter circuit, 20 C when set in place, is a separate unit, 19 B which is then soldered on to the bus- 18 A* 6 YELLOW .0082 .022 .27 .0033 .0012 .0030 150K bars. 17 A "I have enclosed some photographs 16 G* of the completed organ so you can get 15 G 5 .01 .033 .033 .0039 .002 .0039 150K an idea what it looks like. 14 F4F "I am using reverberation, which I 13 F think is very necessary—also the four- 12 E 4 .01 .033 .047 .0047 .0018 .0027 120K foot tones, which are on the top manual 11 D»4f only at the moment. 10 D "I have made some modifications to 9 C# 3 .018 .047 .047 .0056 .0027 .0056 120K the pedal circuit so that I could have 8 C two bass tones controlled with the tab 7 B switches. To do this I took the 47K 6 A#* 2 BROWN .022 .047 .068 .0068 .0027 .0062 resistor .22 and .01 capacitors out of the 5 A pedal oscillator box and wired them on 4 G* one of the filter boards together with 3 BROWN 022 .047 .1 .0082 .0027 .0056 100K another filter as shown. 2 F#

"The output from these two filters is watt amplifier for use in larger halls. then taken to the vacant end of the I find the normal unit is a shade small pedal volume control through a 100K for this use."' resistor thus avoiding the necessity for N. V. (DICK) TEYCHENNE. an extra lead back to the amplifier. "The tone of the extra bass tab is of a much bolder nature although some MEN AND WOMEN r i Make up to £?(> a week for a few slight switch clicks are at times notice- hours' light work in your home. Full able. or part-time. All suburbs and country. "Some time ago we performed on our Write now to Director NEW local TV station with this organ. My DEPT. RH2t, BOX 5070, 0J>.0.. SYDNEY FILTER wife who played it won the best act Please send Sd stamp for reply. No envelope of the night. please. V4 .01■■ "At the moment I am building a 35- mmm lOOK^ I00K AEGIS RED. VOL. A Powerful Asset! ON PANEL Our* ranranqe of line filters includes types designed to eliminate interference «3nd noise thril's carried through the Mains from such things as lifts, refrigerators, etc. We* also have a special power lead inductor/capacitafor To give two pedal tones, the original filler to cope with similar electrical interference at filter components were transferred T.V. frequencies. to the tab panel, an alternative filter added and the selected tone fed Aegis Manufacturing Co. P./L. (—v) down to the amplifier via the pedal 347 Darebin Rd., Thornbury, cdtaunut volume lead. The original pedal Victoria. 'Phone 49-1017 20. volume preset was disconnected. A Radio, Television & Hobbies, June, 1964 ElECTROme HKLOPIENTS PTY. LTD.

AUSTRALIA'S URGES! VARIETY IN KITS OF KITSETS TOP QUALITY COMPONENTS AT LOWEST COST CONTROL UNITS I HI-FI AMPLIFIERS TRANSISTOR 71. Transistor 7 INSTRUMENTS conf. 1. Playmaster No. 8 (MONAURAL) AMPLIFIERS (stereo) 72. Transistor 8 91. 1962 Wide Range 2. Playmaster No. 9 23. Hf-Ft 3 47. Transistor IW 73. Transistor (3-Band) 8 Audio Oscillator 3. Playmaster No. 10 24. Mullard 3-3 48. Transistor 2W TUNERS 92. Transistor Signal 4. Transistor Low Noise 25. Mullard 5-10 49. Transistor 5W 74. Playmaster No. 3 Tracer (Monaural) 26. Mullard 5-20 50. Transistor 10W 75. Playmaster Program 93. Transistor Pattern 5. Transistor Low noise source Generator (stereo) HI-FI AMPLIFIERS TAPE AMPLIFIERS 76. Transistor High Gain 94. V.T.V.M. 6. 4 Channel Audio (STEREO) 51. R.TV A H No. 3 77. Transistor Mod. Gain 95. Millivoltmctcr Mixer 27. Mullard 2-2 52. R.TV A H. No. 4 78. Mullard Wide Band 96. Distortion, noise A 28. Mullard 3-3 53. R.TV A H. Stereo 79. Philips Wide Band Millivoltmctcr CONVERTERS 29. Mullard 10-10 PREAMPLIFIERS INSTRUMENTS MISCELLANEOUS KITS 7. S/W 1 (Batt. or A.C.) 30. Playmaster Unit 1 54. Transistor Mono 80 R.TV A H. 3" Cm. 97. Light Beam Relay 8. S/W 2 (Batt. or A.C.) 31. Playmaster Unit 2 55. Transistor Stereo 81. R.TV A H. 5" Cm. 98. Flasher Unit 9. ALLWAVE 2 (A.C.) 32. Playmaster Unit 3 RECEIVERS 82. R.TV A H. R C 99. Regulated 9-Volt 10. Transistor 2 band 33. Playmaster Unit 4 56. D'xers 1 (Batt or Bridge Supply 11. 50 Mc/s. 34. Playmaster 101 A-C) 83. R.TV A H. Electronic 100. Universal Battery 12. 144 Mc/s 35- Playmaster 102 57. D'xers 2 (Batt or A-C) Stethoscope Charger 13. 50-144 Mc/s x'tal 36. Playmaster 103 58. D'xers 3 (Bait or A-C) 84. R.TV A H. Swp. Gen. 101. Intercom Unit Locked 37. Playmaster 105 59. S/W 3-Band (A-C) 85. R.TV A H. Patt. 102. Stereo Phone Amp. 14. D.D.-D.C. 40 watt 38. Playmaster Twin 10 60. Little General 1961 Gen. 103. Stereo Phone 15. D.C.-D.C. 60 watt 39. Playmaster Twin 17 61. interstate 5 86. R.TV A H. 6V A Adaptor 16. D.C.-A.C, 40 watt 40. Minniwatt Twin 10 62. Dual Wave 5 I2V Tachometer 104. Porta-Playcr 63. Dual Wave 6 87. R.TV A H. G.D.O. 105. Porla-Gram 7 GUITAR AMPLIFIERS P.A. AMPLIFIERS 64. 1962 Stercogram Adapt. 106. Transporta-Gram 7 17. Golden Scries 12W 41. Standard 12W 65. Fremodyne 4 88. R.TV A H. Valve 107. Diode Noise 18. Golden Scries 20W 42. Standard 25W 66. Transistor 1 and Transistor Tester Generator 19. Standard Series I2W 43. Standard 35W 67. Transistor 2 89. Transistor Wave 108. Decade Boxes 20. Standard Series 25W 44. Standard 100W 60. Transistor 3 Meter 109. Wide Band (Cro.) 21. Standard Series 35W 45. Transistor I0W 69. Transistor 4 90. Standard A udio Preamplifier 22. Standard Scries 50W 46. Transistor 30W 70. Transistor 6 Oscillator 110. Remote VFO IF YOU CANNOT SEE YOUR PROJECT LISTED—WRITE FOR A QUOTE, WE HAVE MANY OTHER UNITS AVAILABLE OR IN DEVELOPMENT

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Get this booklet FREE by filling in coupon. j TRITON TAPE Co.. Box 4854, G.P.O.. Sydney. > I Please send me a free copy of the 16-page booklet "HOW I TO MAKE QUALITY TAPE RECORDINGS IN YOUR HOME." I TRITON TAPES I NAME— I I ADDRESS available only by mail MAKE OF RECORDER GC/12 at these discounts 74 Radio, Television & Hobbies, June, 1964 Though, superficially, tape is still tape, and tape machines are still tape gain in the high end is less important if you plan to record at higher speeds— machines, there has been sufficient development in both fields for the natch) hut the fad remains that at this current products to outstrip completely their early counterparts. Not year's hi fi show the tape was all over without reason have there been references to the "tape revolution". the place — easily recognised by its peculiar silvery grey colour. And, more- THE AMERICAN C.B.S. Laborator- Here again, the pressures are the same over, there were new heads to match, ies are generally credited with hav- —a finer gap and closer tolerances in the already trickling in. ing started the tape revolution with their replay head and finer, more uniform and What does this mean? research into miniaturised tape systems, more evenly deposited magnetic par- For those with existing tape record- which would compress music into nar- ticles on the recording tape. ers. modern thinner, smoother and finer rower tracks on slower-moving tapes, It was against this background that grain types will continue to provide a without sacrificing accepted standards of Edward T. Canby, writing recently in bonus in the way of longer playing, re- frequency response, noise and distortion. "Audio" magazine, recorded his observa- duced head wear and possibly C.B.S. demonstrated their proto- tions about the "tape revolution." some small improvement in upper fre- type miniaturised system in 1960 and, Speaking of tape heads, he recalled quency response and noise level, where according to the story reprinted in our the "incredible problems" earlier of these limits are not being set by the November. 1963 issue, were ready at mechanics and electronics of the record- that dale to launch their brainchild on er itself. to the commercial market. Though the By Neville Williams For the more enterprising, there is story focused a lot of attention on the the possibility of fitting better heads to cassettes and the ingenious tape chang- an existing recorder — as and when ing mechanism, the real challenge of maintaining fine head gaps by "air-gap" they become available — though there the whole exercise lay in the head/tape techniques or those involving spac- is the attendant problem of modifying geometry. ing materials. These techniques are now the circuitry to provide the new and When tape recorders made their first giving away to deposition methods, some requisite order of compensation. big impact on the audio field, the gap of them borrowed from the new solid- However, the important products of in the replay head was measured in frac- slate physics, which allow physical gaps the research will be in new, complete tions of one-thousandth of an inch and to be created and measured if need be. recorders and. here, the tape revolution manufacturers took some pride in being in molecular rather than "inch" units. has already begun. Elsewhere in this able to quote a design-centre gap width Parrellel to these new head tech- issue, for example, the Brennell tape of a "quartcr-thou." niques is the development of finer and deck carries heads with a claimed re- Because playback cut-off occurs at a still finer tapes. I can do no better than sponse to 6Kc at a speed of 1 7-8 ips frequency where the wavelength on the quote directly from his observations in and, among the new generation of removing tape equals the gap width, high- "Audio." corders, this kind of figure is more the quality-tape systems had to operate at a Thus 3M's new lull-size tape, already rule than the exception. tape speed of 15 or even 30in per second. sold in initial experimental form during It is safe to say that the process Good domestic quality demanded 7} the summer as LR 1278, is, as I write, will continue for some time yet, with ips and it was an early rule of thumb on the point of standardisation, as 3M's frequency response limits going up as that the top audio frequency in Kc/s 202. Those who have tried it speak of tape speed comes down, with noise and would roughly equal the inches per sec- its extremely fine grain, reduced hiss distortion staying within the limits that ond figure. Thus 7i ips would give a res- level ("more than 4 dh and it sounds seem to be adequate for home music ponse to 71 Kc/s; similarly for the two even better") and measurably lower dis- reproduction. lower speeds, with 1-7/8 ips being very tortion. Also improved head wear quali- To be sure, we are in the middle of much in the "speech only" class. ties. and of course, a gain in the highs a tape revolution. The only thing that The problem which faced C.B.S. at slow speed, allowing the significantly stops tape from superseding the disc is engineers was therefore one of improv- improved performance. All these points the fact that discs themselves are so ing this response/speed ratio by at least are debatable in detail (and the possible jolly good all round! four times and this involved a new approach to head dimensions and manufacture, as well as a substantial refine- REPLACEMENT CRYSTAL CARTRIDGES ment in tape coatings. ACOS In fact, C.B.S. engineers were certainly not alone in striving for objectives. Other GI'67-IG. A high-quality monaural turn- manufacturers had similar ideas about over cartridge .with an extended frequency tape cartridges. response and excellent tracking capabilities. No less important, those concerned A standard replacement crystal cartridge for with the then revolutionary idea of re- most players and changers. Replaces HGI'37 cording video on tape, faced the same and GP65 series. Standard 1" mounting kind of problems at a different arith- bracket. Price: £2/18/6. metic level, in trying to cram megacycles of bandwidth on to tape travelling at still manageable speeds. Their achievements HGP39. Crystal cartridge. Available for in this field are now history, with both standard or L.P. recordings for use with monochrome and colour television being HGP20 and HGP40 Pick-up Arms. so recorded very successfully on the tape Price Single Sapphire Stylus, £3/12/6. medium. Single Diamond Stylus, £5/13/6. More recently, a lot of research has gone into recording video on tape at a Sole Australian Agents: home entertainment level. While it still appears that certain of these schemes were overpublicised in terms both of per- AMPLION (A'SIA) PTY. LTD. formance and economy, there seems little doubt that home video recorders will be Victorian Diitributon: forthcoming at marketable, if not econ- E. W. Cornelius Pty. Ltd.. 5 Northumberland Street. South Melbourne. VICTORIA omy prices. Radio, Television & Hobbies, June, 1964 75 Choose a Goodmans

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Radio, Television & Hobbies, June, 1964 Ferrari's Overture to "The Secret of Susannah." Among the more frankly popu- hr items, in which sophisticated listeners ^ v ^ might interest their children, are Ander- son's "Syncopated Clock," Coleridge Tay- or's "Demand and Response" from his i-evieivs "Petite Suite de Concert." Eric Coales' ^5 By JULIAN RUSSELL "Ldndon Suite," Gillis' "Ranch House Party," and Scott Raymond's "Toy Trumpet." This list still leaves unmenlioned a rich residue of works of general — and Piano Concertos — Bath, Mozart sometimes unusual — interest, among them Dvorak's "Golden Spinniitg- Bach—Concerto in D Minor for Three a novelty—I know of no other recorded Wheel." Enesco's "Roumanian Rhap- Pianos and Orchestra, BWV1063. version—while others might well find it sody, No. 1." Ibert's "Ports of Call," Italian Concerto in F Major, an attractive starting-point on which to Kabalevsky's "Colas Breugnon" Over- BWV971. build a collection. Certainly no Mozart ture. Respighi's "Pines of Rome." Rirn- Mozart—Concerto in F Major for Three library would be complete without it. sky-KorsakofTs "Capriccio Espagnole" Pianos and Orchestra (K.242). The Casadesus family play it as if and the March from "Le Coq d'Or," Robert, Gaby and Jean Casadesus they were-—as they probably are—all Sainl-Saens' "Introduction and Rondo (pianists) with the Philadelphia trained by the famous father, Robert. Capriccio," Tchaikowsky's "Romeo and Orchestra conducted by Eugene Their temperament is cool, their articu- Juliet" Overture, and Wagner's Over- Ormandy. lation elegantly smooth, their pace un- tures of "Rienzi" and "The Master- Kalian Concerto with Robert Casa- hurried. In short, they play ideally. desus only. singers of Nuremburg." CBS Stereo SBR-23046. The orchestra under Ormandy betrays And to keep the collection pleasingly The famous Mozart authority Alfred a little of the lushness of the romantic varied will be found such tried and Einstein was extremely destructive in 19th century in those passages in which proved favourites as "Four Hungarian his comments on the F Major Triple the pianos are silent, though they adopt Dances." (Brahms). "Espana" (Chabrier). Piano Concerto, relegating it to per- a matching 18th century style whenever "Rhapsody in Blue" and "Concerto in F" formance by "lady amateurs" and affix- the pianos enter. (Gershwin). "Grand Canyon Suite" ing to it the condescending label "galant." Bach wrote on the title page of his (Grofe), "Sabre Dance" (Khalcha- But the concerto, written when the com- Italian Concerto; "Composed for Music turian). "Midsummer Night's Dream" poser had just turned 20, is always en- Lovers to Refresh Their Spirits." It still Overture (Mendelssohn) and many others joyable even if, admittedly, it fails to does so and I have no doubt that the too numerous to list here. measure up to •those Mozart produced composer himself would not have From this abridged list it will later. objected too strenuously to the way it be noticed that no great skill would be Its "galant" style sounds nowadays a sounds transferred to a modem piano- needed to build several well-designed little facile to ears accustomed to the forte. That is, in all the passages except programs for many an evening's enter- profundities of the later concertos but those where Robert Casadesus is just a tainment, programs which include some- few would deny its courtliness and, if little heavy-handed. But otherwise the thing to appeal to everyone with taste its rare passages of warmth are devoid playing is generally very sprightly and of passion, well, they fit perfectly into alert even if the tempo of the first Mozart's modest scheme of things. Few movement is slightly faster than bracing. will agree with Einstein, that ... we The Bach triple concerto displays this shall not concern ourselves further with heavy-handedness only here and there in purely "galant" music. Since I have the slow movement. Elsewhere every- EKCO-STYLUS acquired this disc I have played it thinfl is as it should be. Unlike the several times, without wearing out my balance in the Mozart, the orchestra in Sapphire and Diamond response to its charm, while aware that the Bach is placed a little too far behind this feature might be labelled a little the piano solois:s so that one some- glib. times misses ingenious string counter- NEEDLES Those with the full recorded comple- points. This, however, was the only fault ment of Mozart Piano Concertos in their 1 could find in an eminently enjoyable, libraries might well welcome this one as and unusual, disc. • "DI-FI" for HI-FI! The Premier Diamond Needle for the discriminating MUSIC Everyone's Concert Favourites LOVER. Everyonc's Concert Favorites. 12 rec- side these last include Bizet's • PROFESSIONAL DIAM- ords plus one free one issued by "Farandole" from "L'Arlesienne Suite," Readers' Digest RCA at £14/10/. Granados' "Intermezzo" from "Goyes- ONDS for the CONNOISSEUR In an album with booklet. cas," Grieg's "The Last Spring," Hump- Used by: Once again Readers' Digest offers a crdinck's "Dream Pantomime" from feast at bread and butter prices — a "Hansel and Gretel," Mozart's "The Broadcasting Stations and feast with a tempting menu efficient- Sleigh Ride." Tchaikowsky's "Polonaise" those who KNOW! ly served. This new set is obviously de- from "Eugene Onegin" and Wolf- signed to extend the "taste range" of A superlative, ultra-fine those who bought the last Readers' needle; ideal for Expensive Digest issue which confined itself mostl Hi Equipment. to what might be described as "stanid- ard classics." AVAILABLE AT ALL GOOD MUSIC HOUSES "Everyone's Concert Favorites" adds to this many compositions of more recent Use our l4eedlc Clinic for FREE date — though modernism is carefully examination of your Needle eschewed if one omits Stravinsky's "Fire- bird." Debussy's "La Mer," and Ravel's Retipping a Specialty "Spanish Rhapsody" and "Alborado del Gracioso" from that category — in programs that might be heard in entertain- ments ranging from light music recitals ERNEST KUENZLI to symphony concerts. The 13 discs even offer some interest- PTY. LIMITED ing pieces that the owners of well-stocked record libraries might find difficulty in 60 HUNTER ST.. SYDNEY obtaining on other labels. On the lighter N.S.W. Phone 28-6991 Radio, Television & Hobbies, June, 7964 77 // % DIAMETER

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Impedance: Dual—50 and performance, with rising response Frequency Response: 50—17,000 150 ohms (matches all low im- to 6,000 cps. cps. pedance inputs 50 to 250 ohms). Impedance: (>ow. Impedance: Dual — 200 ohms and Diaphragm: Shure Duracoustic Diaphragm: Shure Duracoustic high. Diaphragm: Shure Dura- £88. £49/10/. coustic £41/10/- PTY. AUDIO ENGINEERS LTD. 422 KEKT ST., SYDHEY. 29-6731. 44 WARREN ST., THE VALLEY BRIS. 2 6754. Radio, Television & Hobbies, June, 1964 cultivated to appreciate sound more sages and so relegates the singers to a passages with undue hurry and even sophisticated than that originating in background position not at all in keeping when he and his band reach their usual Liverpool nowadays. with the tradition of Italian opera of high standard of performance, the vapi- Some of the orchestras used are fam- this type. dities of the second work provide them ous — the Royal Philharmonic is one For the perfect wedding of singers and with poor material to work on. Both — while others are not so well known orchestra in this work I remind readers works are suspected by scholars as being to record buyers. But the playing on of de Sabata's old mono recording, still not wholly composed by Mozart. And all the discs is generally of a high, and obtainable, but a little the worse for Enesco'a anachronistic cadenzas make never less than an extremely competent, wear as far as the sound in concerned. the melange still more unsatisfactory. 1 standard. The same goes for the con- De Sabata generated even more excite- can only think that Menuhin included ductors, with Massimo Freccia (recently ment than Karajan in the orchestral part them because of his adoration for his in Australia for the A.B.C.) and Rene without, however, impinging on the sing- former teacher. Leibowitz heading the team. ers' privileges. You will find an occasional movement The engineering is R.C.A.-Dynagroove Many of the passages that Karajan — the Andante Cantible of the Fourth which is as good as most available to- takes forcefully are magnificently effec- Concerto, is one — during which you day, and though my review set is in tive — the agitato opening of the An- can relax and respond effortlessly to the stereo, mono sets are available for those gelotti motive, is one. But when he comes charm of the music. But these treats who have not yet set up two-channel to the rich ensemble writing of the first are much too rare. equipment. The accompanying booklet act finale, the voices in the Te Deum re- ★ ★ ★ contains all relevant information neces- treat most ineffectively behind Karajan's Vaughan Williams—Symphony No. 5 in sary about the composers and their too heavy orchestral accompani- in D Major. Philbannonia Or- works. Occasionally, but, I must stress, ment. The Sacristan's music, too, is very chestra conducted by Sir John Bar- only very rarely indeed, one strikes an fussily phrased though this, to some ex- birolli. HMV OASD508. inch or so of prickly surface, but that tent, may be excused since it distracts might happen in any volume of 13 rec- the attention from the curious hiccuping Those listeners who own, or remem- ords, however highly priced. delivery favoured by Italian character ber, Boult's performance of this sym- This set is not cheap and nasty — it singers when they seek to portray a feeble phony, recorded for Decca under the is cheap, all right, but very good, and I old man. composer's supervision, or rather, with highly recommend it to those about to Having said all that, I can go on to start a collection of well-played, well- describe the new "Tosca" as a very fine recorded discs. job indeed — with one other exception. ★ ★ ★ Di Stefano's voice, in the role of Cav- RADIO DESPATCH SERVICE Puccini — To sea. Complete Opera aradossi,- sounds as if it were due for a Leontyne Price (Tosca); Giuseppe long rest. To say that the bloom is off 869 GEORGE STREET, di Stefano (Mario Cavaradossi); it is to be kind. Nowadays he has to Giuseppe Taddel (Scarpia); Car- strain after top notes he used to take SYDNEY lo Gava (Angelotti); Fernando Cor- with ease, and displays rough ena (Sacristan); Piero de Palma spots throughout his whole register. R WISH TO ANNOUNCE (Spoletta). The Vienna Philharmon- However, he still has such good musical ic Orchestra and Vienna State manners abd knows the role so well TO ALL OUR VARIOUS Opera Chorus conducted by Herbert that, despite his present handicap, he von Karajan. RCA Red Seal LDS- manages to get by without anything too D CLIENTS AND CUSTOMERS 7022. dreadful happening. A recent issue of 'The Gramophone" Leontyne Price is in glorious voice SThai after 30 years out devoted a long article to Herbert von throughout and is careful not to ham a 'Phone numbers hare been Karajan under the title of "Portrait of role that lends itself so alluri'ngly to changed to the following the Conductor as Celebrity." It described the practice of tearing a passion to tat- 211-0816 211-0191 him driving sports cars at high speed, ters. She is a rich-voiced, dignified, fiery piloting his own light aircraft, and Tosca — an actress, a lover, and a The independent wholesaler ski-ing in the Alps after more prudent loyal conspirator, all at the same time. sportsmen had decided to turn it up. Giuseppe Taddei is a highly efficient open Saturday morning In all a very forceful character. Now, Scarpia, better in the more brutal fea- there is no reason why any conductor tures of the role than in those aspects shouldn't be as glamorous a public figure that demand a silken, aristocratic as Karajan. Many of them are. And villainy. some of his colleagues are reputed to be But the outstanding performances just as hard taskmasters as Karajan come from Price and Karajan. And I shows himself to be by his work in must admit that though I resented some opera houses, concert halls, and on of the latter's instrusions in the first records. act there were later scenes —■ the ris- No one could have been a more de- ing tension in Act 2, the beautiful play- manding martinet than the late Arturo ing of the Vienna Philharmonic in the Technical Transfers Toscanini, who exercised rigid discipline Prelude to Act Three, and the final cli- over all the performers he was directing max of the opera, that had even a dis- FOR PROFESSIONALLY MARKING AND — singers and players alike. However, illusioned old critic like myself quite TITLING INDUSTRIAL, SCIENTIFIC AND when Toscanini was conducting a typical breathless with excitement and admir- AMATEUR EQUIPMENT singers' opera like "II. Trovatore," or for ation. By using Teknj-Cals it is easy to pro- that matter Puccini's "Tosca," he care- A verv handsome book indeed accom- duce factory- finish markings and titles fully kept the orchestra in its rightful panies the boxed set. on your prototype and home-built equip- place, in the background, and in the case ★ ★ ★ ment at low cost, without the aid of of 'Trovatore," he did this despite the Mozart — Violin Concerto No. 4 in special devices. care he lavished on obtaining from his Tekni-Cals are supplied in book form, D Major (K.218). Violin Concerto each book covering a particular subject: band a perfect accompaniment. No, 6 In D Major (K.217a). Yehndl Audio, Hi Fidelity, Transmitters, Re- But it remained an accompaniment, MenuUn with the Bath Festival ceivers, Instruments, Oscilloscopes, while Karajan, in 1962, received highly Orchestra. HMV Stereo OASD567. V.T.V.M. and Decade Boxes, Workshop critical notices for his performance of The absence of a conductor's name and Dial Sets. "11 Trovatore" in Salzburg — which I in the title paragraph means that Menu- Write TODAY for a Free Catalogue. happened to hear — for the manner in hin himself directs the orchestra as well which his orchestra intruded between the as playing the solo part. While this tends singers and the audience — and that to produce a unified interpretation of included Karajan himself, too. the works, it is achieved at some slight CUT AND MAIL — — — — The same state of affairs is to be expense to precision in the orchestral Elactronic Supplies, noticed, admittedly to a lesser degree, in part from time to time. And on the Box 417. P.O., Crown St.. Sydney. N-S-W. the first act of the new RCA "Tosca." whole I think it can be fairly stated that Elsewhere the balance is better. But in neither Menuhin nor his orchestra are, the first act Karajan supplies an accom- on this occasion, right up to the top of paniment of almost Wagnerian strength their form. to some of the more interesting pas- Menuhin attacks some of the fast Radio, Television A Hobbies, June, 1964 his blessing, some years ago, might find Barbirolli's undoubtedly fine account of WHen we released the ADC-3 cartridge about a year ago, the work a little too less intense for their taste. But whatever your prefer- we claimed, that it represented the best value of any Hi-Fi ence in the way of interpretation, the new recording is way out in front in component ever offered in Australia. Our claim has been the matter of engineering. HMV's sound is splendidly open and more than substantiated by the undeniable fact, that the resonant and, in the stereo version, ad- mirably distributed between the two ADC-3 Is outselling any other magnetic cartridge available speakers. To compare the Boult and in this country. Barbirolli performances side by side, as I did, is to reveal the tiniest divergences imaginable. But how important such AND NOW. WE MAKE A SIMILAR CLAIM FOR THE SUPERB trivia can be when one's likes and dislikes are in question! There are small differences in tempo. Boult, for instance, takes the Scherzo a shade faster than Barbirolli, though ADC-40 Boult is always more tightly organised, which, in itself communicates a sense of greater speed. In the first movement of the Barbirolli reading serenity only just manages to win its struggle against doubt, whereas in the Boult that issue PRITCHARD TONE ARM is never so markedly at stake. I prefer the animation that Barbirolli manages to get into the Passacaglia to which we are also placing on the market as a promotional Boult's less vivid account of this movement. Perhaps, summing up the whole item at the low, low price of only £16.10.0 (It retails in the work, Boult's treatment is a trifle more U.S.A. for 44.50 dollars). To say, that this is splendid spacious than his rival's. But the differences between the two readings are too value for money, would be an understatement. intangible to be put down in print. Morover much will depend on your This high-grade, professional intrument has been acknowl- personal preference. I would be happy with either interpretation. And, as I edged throughout the world and will track unlmpeachably wrote above, the new sound is a great at ^ gram, when used with the famous ADC-1 and ADC- improvement on the earlier. ★ ★ ★ Point Four cartridges, for which it was specially designed. Bruckner — Symphony No. 4 (The Romantic) in E Flat. Vienna Symphony It is, indeed, the most advanced pick-up arm available Orchestra conducted by Franz Kos- anywhere today and is made to complement the new breed witschny. Festival Stereo FDS197. The Fourth Symphony is the most of playback heads, immediately appealing of all the Bruck- ner symphonies — that is, if his music SPECIFICATIONS: speaks to you at all. It is, at any rate, his best known. Konwitschny's performance advertises a deep love for the MOMENT OF INERTIA: Lower than that of ony other work, which he never allows to betray p.u. arm. him into juicy relishing of the many beautiful cadences that pass from time SIDE THRUST; Eliminated by side thrust compensator. to time. BEARING FRICTION; Virtually unmeasurable. The romantic remoteness of the horn call that opens the work establishes the SHOCK SENSITIVITY; Very low, as orm is balanced in climate for all that follows. The slimly all planes. built second subject is supported by firm bone structure under its rosy flesh. And EXTRANEOUS RESONANCES: Completely suppressed Konwitschny uses tempos that keep the by specially treated walnut body. work moving smoothly without drag. Nor is pompousness permitted to mar the HEAD SHELLS: Interchangeable. lyrical musings of the following slow LENGTH: 10^" overall. movement. The scherzo, with its hunting calls, PIVOT TO STYLUS TIP: 9". is effectively contrasted against a trio section that is rustic in a different, more REAR OVERHANG; U" maximum. feminine way. Bruckner probably had a FUNDAMENTAL RESONANCE: 6 cycles per/sec with little girl in mind, since during most of his adult life he tried to find a partner ADC-) and ADC-Point Four cartridges. many years his junior. If the composer's tautological style does not weary you The instrument will accept most cartridges with standard fixing too much you will come across much centres. The system comes completely assembled and wired, and is to admire in the Finale. The conductor, provided with a cable assembly ready to plug into amplifier. by ringing subtle changes on the repeats, skilfully avoids what often threatens to become tedium and offers a movement that is as massive in execution as it is J. H. REPRODUCERS in conception. The sound could be a little brighter, especially in the brass section. A little 10q PINE AVENUE, ELWOOD, VICTORIA more snap in the tone would help largely to dissipate a good deal of the Telephone 91-4583 chorale-like qualities of some of the Exclusive Importers and Australian Representatives for ADC, U.S.A. brass passages. But against that can be set even distribution of the sound that goes far to lighten the thickness of the scoring. Radio, Television & Hobbies, June. 1964 Kindly Light," "Rock Of Ages," "Fairest Lord Jesus' and "Now The Day Is Over." Technically, the quality throughout is excellent, with balances and diction both VARIETY FARE well preserved. There is only one reser. vation — a noticeable sagging of the Neville Williams pilch in "God Of Our Fathers." It could be the choir itself at fault but I am ^ Jamieson Rowe more inclined to blame a brief speed variation in the master tape or disc. Some may not even notice it but. in any Keith Jeffcoat case, it isn't sufficienl to cancel the merits of the disc on every other track. If you like simple hymns, well sung, this record is well worth a hearing. which they have built up since their (W.N.W.). commencement in 1951. * * * 0pimttanal "Slabat Mater Dolorosa," "O Quam HANDFUIS OF MUSIC. Joe and Tristis Et Afflicla," "Fac Ut Ardeat Cor OLD TIME RELIGION. Jimmy Little, Marion Talley, with the Dick An- Meum." "Quando Corpus Morietur," Vocal with Orchestra. Mono, Festi- thony Choristers. Stereo, Word "Ave Maria," "O Vos Omnes," "Bene- val 4SEP, FX-10783. (Gospel Film Ministry) WST.8I28- dictus." "Duo Seraphim." "Kyrie," "Sanc- Interest: Popular religious. LP. (Also available in Mono.) tus' 'and "Agnus Dei." Performance: Matter of opinion. Interest: Gospel musical. The jacket notes give the Latin text Quality: Normal mono. for each. Jimmy Little, now so prominent on Performance: Spirited. the Australian vocal scene, seems fated Quality: Well up to standard. To anyone who has heard earlier to present me with problems. Last time Stereo: Routine. Japanese popular records, the sound of it was an early and very poor LP disc Joe and Marion Talley, with their II- the electones — Japanese electronic organs—is unmistakable, although cer- that should have been buried at sea year-old son Paul, are a musically gifted rather than be re-released to unsuspect- family who travel as a Gospel musical tainly not unpleasant. Up to three are ing buyers. This time it's a 45F.P about team, assisting at rallies and crusades. used, by the way. to gain a multi-rank which I can't generate much enthusiasm. Typical of such teams, their presentation effect. Singly, the numbers might fit well enough on the platform is designed for immedi- The choir itself is extremely good and, into the hit parades but, heard one after ate impact and majors on "busy" ar- by and l-arge, would not suffer by com- the other, they are just too stereotyped rangements of well known Gospel parison with the Vienna Boys Choir, —or should I say "mechanical"—to be melodies. Unless I miss my guess, the with whom they have made joint ap- really enjoyable. music here is simply an audio record pearances in Japan. Just occasionally Or perhaps it's just that I'm not suf- of their platform routines. there is a tendency to shrillness which ficiently steeped in the currently popu- Not surprisingly, the music isn't dis- might have been better controlled. lar idiom to appreciate Jimmy's efforts tinguished by any special subtlety of Whether the program will appeal is to use it as a vehicle for his undoubted- polish but, in the realm of Gospel enter- something which con only be an in- ly sincere religious beliefs. Best you tainment. the Talley family must be dividual decision. However, if it does hear it for yourself. judged as successful. Joe Talley is the appeal, you need have no worries about The titles: "Old Time Religion," "I outstanding performer on trombone, the presentation. Technically, the disc suffers from Am On The Battlefield." "The Church banjo and guitar while 11-year-old Paul enough stray surface clicks to remove In The Wildwood" and "Life's Railway shows more than usual talent for his it from the "dead quiet" group, while it To Heaven." age, as an accordionist. also sails close to the limits here and Technically speaking, the quality is The track titles: "Since I Hove Been quite okay. (W.N.W.) Redeemed," "New Name In Glory," there, in terms of tracing distortion. On "What Though Wars May Come." "Jesus the credit side, the stereo is very good, Loves The Little Children." "God Will as are most of the King recordings. Take Care Of You," "Still Sweeter (W.N.W.). \ Stage and Screen J Every Day," "Sometime Soon" and * * * "Saved By Grace." "I Never Walk THE GOOD OLD HYMNS. The Roger THE GONDOLIERS. Gilbert and Sulli- Alone." "The Fight Is On," "1 Was There Wagner Chorale, Conducted by van. The D'Oyly Carte Opera Com- When It Happened" and "When The Roger Wagner; Soprano Soloist pany with Chorus and Orchestra, Saints." "Moment By Moment." Maurita Philips; Baritone James conducted by Isidore Godfrey. Re- On the technical side, the general Tlppey; Produced by Ralph corded under the direction of Brid- balance of some of the tracks could have O'Connor. Mono, Capital W-1923. get D'Oyly Carte. Decca Ace of been improved, I feel, but balance is (Also available in Stereo SW-1923.) Clubs 12in mono, 2-disc set, ACLA so often a matter of opinion. Other- Interest: Hymns, unembellishcd. 1151-2. wise. the sound on the stereo copy, which Performance: High standard. Interest: Economy G. and S. I was given for review, is well up to Quality: Good, with one reservation. Performance: Authentic. standard. Disc and jacket, by the way. There is a great deal of truth in the Recording: Satisfactory. are both original American productions. jacket notes, which point to the merits This two-disc mono recording of (W.N.W.). of simple hymns, uncomplicated and Gondoliers on Decca's economy label ★ * ★ composed for congregational singing: should interest all who are searching for AN ALBUM OF SACRED HYMNS. hymns which reflect the many aspects and a recording of the opera at a moderate Tokyo Boys and Girls Choir. Con- convictions of the Christian faith. cost. An authentic, disciplined perfor- ducted by Shln'ichi Hasegawa, It is in this spirit that the Roger mance, it offers good value for money. Father Paul Anovilh. Eleclones, Wagner Chorale sings "The Good Old The principals should be familiar to Hidcrai Saito and His Group. Stereo Hymns" — in parts and without instru- followers of the D'Oyly Carte Company Festival SFL-931256. mental accompaniment. Apart from a —Leonard Osborn, Alan Styler, Muriel Interest: Traditional, c h i I d r e n's few excellent solo interpolations and the Harding, Yvonne Dean, Richard Watson, choir. changes in tempo inherent in the parti- Martin Green. Ella Halman, Margaret Performance: High standard. cular items, no attempt is made to em- Mitchell and Henry Goodier. The sing- Quality: Good but not perfect. bellish the presentation. To some, the ing. as one would expect, is of a very Stereo: Excellent. result may be rather dull, but it certainly high standard—particularly in terms of Through their handling in Australia of won't be to those who have an innate diction, which is often a stumbling- "King" records, Festival have highlighted regard for these famous old hymns: block with G. and S. performances. the capacity of Japanese artists and "Jesus Loved Me," "The Old Rugged The recording is good, apart from a groups to produce "western" type music Cross." "In The Garden." "Bringing In slight touch of overload distortion dis- of a very high standard. We have had The Sheaves," "What A Friend We Have cernable in some of the choruses. Sur- electronic organs, orchestral. Hawaian, In Jesus," "God Of Our Fathers," face noise is quite low. vocal and jazz; now we have a children's "Nearer, My God, To Thee," "In The The two discs are coupled, i.e., one choir singing excerpts from a repertoire Sweet Bye And Bye," "Abide With Me," has sides 1 and 4 and the other 2 and of Gregorian, Renaissance and Baroque "The Little Brown Church," "Lead, 3. However, the sleeve information is Radio, Television & Hobbies, June, 1964 81 PROFESSIONAL. TURNTA8UE MODEL. 605L.

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6 Railway Walk, Camberweil, Victoria. 82 1256 82 Radio, Television & Hobbles, June, 1964 slightly misleading as it describes a non- tortion and negligible surface noise. For mental recording of the first eleven coupled layout of sides. those in need of an abridged recording fugues of Art of the Fugue. As the in- To sum up, this would seem a good of the operetta, a high-quality perfor- formation given above the "nutshell choice as an economy mono Gondoliers. mance well recorded at a bargain price. summary" shows, it is played by the The performance is good and on all but (J.R.) Fine Arts Quartet and the New York the highest grade equipment the touch ★ ★ ★ Woodwind Quintet. of distortion will probably not be obvi- INDIAN LOVE CALL. Rudolf Friml As transcriptions for strings and ous. (J.R.) plays and conducts the Friml Or- woodwinds the fugues seem rather chang- ★ ★ ★ chestra, "Donkey Serenade," "Vaga- ed. The different voices are more bond King," "Rose Marie," clearly differentiated from one another LEHAR: THE COUNT OF LUXEM- "L'Amour Toujours L'Amour," than when played on an organ or harp- BOURG. (abridged). Victor Reins- "Some Day," "Song Of The Vaga- sicord, but slight timing variations seem hagen conducting the Chorus of the bonds," "Indian Love Call," "Sym- to make them more mechanical. The State Theatre, Zurich, and the Ton- pathy," "Only A Rose," "March Of later ones almost assume the features of halle Orchestra. Rupert Glas- The Musketeers," "Giannina Mia," a huge Heath Robinsonian machine, or witsch (tenor), Willy Schoneweiss "The Mountles." Westminster, perhaps a tonal "Strasbourg Clock" — (baritone), Hugo Kratz (tenor), Nora Mono. WC.31,102. with lots of intricate thematic mecha- Jungwirtb (soprano), Wanda Von Interest: Lasting popular. nisms going on currently, but separately. Kobierska (soprano). Decca Ace of Performance: Smooth and dreamy. This doesn't seem to happen with a Clubs 12in mono, ACL 195. Quality: Very good. keyboard version, perhaps because the Interest: Lehar operetta. Rudolf Friml is probably best known single person "in control" is more in- Performance: Good. for his light operas. In 1912 he rose tegrated in his actions, bonding the parts Recording: Good. to success with "The Firefly" and in the together. As an economy abridged version of 1920s, probably his richest years, he The playing is excellent. Scholarly, Lehar's Count of Luxembourg, this re- composed such notables as "The Vaga- perhaps, but with feeling. I was taken cording represents good value for money. bond King," "Rose Marie," 'Three Mus- aback at first with the speed at which The singing is of a high standard and keteers" and "L'Amour Toujours the fourth fugue is played, but after a the orchestra plays with admirable crisp- L'Amour." The numbers on this disc few repeat hearings I think I even pre- ness. The pieces played are "Introduc- are enduring favourites drawn from his fer it that way. In all, a jolly fine per- tion"; "Chor-Sc liri liri"; "Wir bummeln most successful light operas. formance. —Ja doppelt schmckt's dem Bubchen"; The Friml Orchestra is mostly strings, On the technical side the disc is great. "Ich bin verliebt—Funfmalhundert- piano, rhythm, and enough brass and Crisp, clean recording, negligible distor- tausend francs"; "Unbekannt, deshalb reeds to make it interesting. Their style tion and very low surface noise. nicht minder intressant"; "Finale Act I"; is best described as "straight" and, as To the Bach lover, and more particu- "Hoch, Eroc, Angelc—Madel Fein—Pol- might be imagined, this combination larly those who are keen on Art of the katanzer"; "Lieber Freund man greift makes for good background or dinner Fugue; recommended. (J.R.) night nach den Sternen"; "Trefle incar- music. ★ ★ ★ nat"; "Finale Act 2"; and "Leibe ach du The quality of the disc is good — a LIST PLAYS LISZT. Piano Concerto Sonnenschein" (Act 3). clean sound, nice balance and, in places, No. 1 in E Flat, Malediction for The recording is fine, with low dis- a fairly wide dynamic range. (K.W.J.) Piano and Strings, Hungarian Rhap- sody for Yiolln and Orchestra (or- chestration by Hubay). Eugene Instrumental, Vocal and Humour List, piano, Carroll Glenn, violin, with the Vienna State Opera RENAISSANCE FESTIVAL MUSIC. Stereo Quality: Fine. Orchestra conducted by Gyorgy The New York Pro Musica For those unfamiliar with the work, Lehei. Universal Record Club 12in Ensembles directed by Noah Green- Bach's "Art of the Fugue" is a series stereo SUC-545. berg. Universal Record Club 12-inch of some eighteen fugues based upon a Interest: Liszt piano, violin. stereo, SUC-541. common root melody and arranged in Performance: Sparkling. Interest: Renaissance music. order of increasing theoretical elabora- Recording: Excellent. Performance; Recreative. tion. It was the composer's last work, Stereo Quality: Ditto. Recording: Excellent. and was intended as a permanent record Liszt lovers should find this recording Stereo Quality; The same. of his mastery of the fugal form. It by pianist List and his violinist wife was never completed. Carroll Glenn quite irresistible. The Still more from Noah Greenberg and To me it always seems faintly surpris- playing by both soloists and orchestra is his band of enthusiasts, this time playing that musical compositions which splendid, they are playing quite popular ing a collection of dances, canzons and have been rigorously "brewed up" in this Liszt pieces and the recording is really other pieces of the Renaissance. As way—almost mathematically—can sound fine. usual, the playing is of a very high expressive and pleasing to the ear. Or In the somewhat halting first allegro standard and it is obvious that the per- more specifically, to many ears (includ- of the Piano Concerto List and the or- formers were striving to recreate the ing mine). And yet they do, as Art of chestra play with a confident sparkle music as it was originally heard. the Fugue demonstrates. which to me does full justice to the The first side has a collection of seven The answer is, I suppose, that the composer's "maestoso" indication. In dances taken from a "Music Book of things in music to which we human be- the slow section which follows. List plays Little Dances" published in 1551 by ings respond are the very relationships with wonderful timing and continuity, one Tielman Susato. of Antwerp. These between tones, tone combinations, periods seemingly wringing all the expressiveness are followed by a canzon—"La Pado- of silence and so on that feature in the that wrought from this delicate sequence. vana," by Lodovico Viadana, The second scientist's and mathematician's descrip- The final section repeats the zest and side has pieces by Giovanni Gabrieli, his tion of the world. We LIKE regular sparkle displayed in the first movement. uncle, Andrea Gabrieli, Giovanni Bat- arrangements of tones and silences, On the second side the Malediction tista Gritlo and Florentio Maschera, ascending and descending series of tones, gives List the opportunity to display his The recording quality is excellent, with interlocking patterns of melody-series, considerable technical virtuosity and negligible noise and distortion. The and so on. And since this is so, it talents of expression, and he accepts the stereo is well balanced and without should be just as logical to arrive at a challenge. My only criticism here is exaggeration. pleasing musical piece by a rigorous of a faint coldness which he seems to For Pro Musica followers and other assembly of the theoretical "building display—but then I must confess that to lovers of early instrumental music, a blocks" as it is by a "this sounds good" me the piece is rather austere at best. real treasure. (J.R.) elaboration of a given or accidentally To round off the disc there is the ★ ★ * hit-upon initial melody. Rhapsody for Violin, which was origin- J. S. BACH—ART OF THE FUGUE. After all, we are told that electronic ally written with piano accompaniment Contrapunctl I-XI, inclusive. The computers and "music synthesisers" are but here played to the orchestral accom- Fine Arts Quartet and The New quite capable of composing musical paniment adaptation made by Jeno York Woodwind Quartet. Univer- works of considerable beauty, and these Hubay. Miss Glenn displays great con- sal Record Club 12-inch stereo, machines can hardly be said to use the trol over her Guarnerius instrument in SUC-498. "this should sound nice" approach. this piece, and receives staunch sup- Interest; Art of the Fugue. Even so, it still seems faintly sur- port from the orchestra. Performance: Scholarly, with feel- prising . . . Technically the disc is excellent. The ing. Anyhow, the disc which set me off on recording is well balanced both tonally Recording: Excellent. the foregoing rumination is an instru- (Continued on Page 86.) Radio, Television & Hobbies, June, 1964 NEW

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Radio, Television & Hobbies, June, 1964 Now available in Australia! VARIETY FARE- Cont and stereophonically; there is negliciMc distortion or surface noise, and the treble register is crystal-clear. The soloist microphones have been placed neither too far away, nor so close that they pick up breathing and other noises. All in all, a really splendid recording and a treasure for Liszt enthusiasts. (J.R.) ★ ★ * MUSIC TO HELP YOU STOP SMOK- TAPE RECORDERS ING. The Living Strings, Stereo. "THE CHOICE OF PEOPLE WHO KNOW" R.C.A. Camden CAS-821. (Also available in mono.) Here from Britain—brilliant in design, engineering, per- Interest; Melodic mood music. Performance: fairly routine. formance! Here—for you—the absolute fidelity of repro- Quality: Satisfactory. duction that has made "Brenell" so great a name around Stereo: Of no special consequence. the world. What a silly title for a record! Even if it can be explained, it's still silly, because a title shouldn't need a MARK 5 SERIES laboured explanation. Having duly disposed of the above re- TYPE "M" MODEL action, I can report that the disc is a fairly normal presentation by Cam- ...A Brenell's outstanding newcomer den's "Living Strings" orchestra. Musi- ™ tW. —"the recorder that makes cally, nothing very special is attempted ENTHUSIASTS," and meets the or achieved, the, main purpose being to **' A fllO exacting demands of. profes- generate a pleasing sound which will fit rS O ■ _ \ sionals. Four tape speeds—15, in with dining or relaxing. '9 ® • '• 7i, 3i, 1J i.p.s.; frequency re- The titles, some arranged in medleys, * sponse 40-20,000 ± 3dB; three include "Autumn Leaves," "April In motors; hysteresis synchronous Paris," "The Night Is Young . . ." "In type for capstan drive,- separate The Night," "If There Is Someone Love- recording and replay head and lier Than You," "Clair De Lune," "Yel- amplifiers enabling tape monitor- low Bird," "Theme From Carnival," ing; pause key and superimpos- "Penthouse Serenade," "If Ever I Would ing facility; recording level Leave You," "Love's Old Sweet Song," meter,- adjustable rotary tape "Piano Concerto In B-Flat Minor." guide. "Polonaise In A-Flat." Models priced from £183-17-3 The quality is to normal standards and the stereo variable, being sometimes quite obvious, at other times the reverse. I wondered about this until I noticed that the various tracks are arranged and conducted by four different MODEL STB1 people. , ^ 9^ A mono/stereo recording and But why worry if the objective is soft replay unit, with three motors, lights and sweet music? (W.N.W.) — \ hysteresis synchronous type for ★ ★ ★ , ^ capstan drive,- four speeds—15, FAMOUS MARCHES FROM THE • \ 7i, 33, li i.p.s,-. four heads,- CLASSICS. The Band Of The frequency response 40-20,000 ± Grenadier Guards Conducted bv 3dB; replay facilities for both i Captain R. B. Bashford. Decca 12- ^ f ^ * and 3 track for mono/stereo inch mono, LK-4S38, tapes; mixing and tape monitor- Interest: Band classics. ing facilities,- twin recording am- Performance: Drilled. plifiers and twin replay pre- Recording: Good. amplifiers suitable for connection Admirers of military bands and the to external hi-fidelity amplifiers. Grenadier Guards Band in particular Priced from £269 13-4 will probably find this disc irresistable. With their usual disciplined yet expressive playing they march with austere MONO/STEREO DECKS AVAILABLE FROM £64 0 0 pomp through the following 11 tunes: "Entry Of The Boyards" (Halvorsen. Mail fhe coupon below fo your nearest RCA dealer for arr. Winterbottom); "Turkish March" brochures giving details of all models. (Beethoven, arr. R. Bashford); "Hun- garian March" (Berloiz. arr. C. God- frey); "Procession Of The Sirdar" Please send me detailed brochure on (Ippolitov-Ivanov, arr. D. Godfrey); □ Model STB 1 "Radetsky March" (J. Strauss sen., arr. □ Mark 5 Type "M" Richardson); "March Militaire" (Schu- bert); "Aida Grand March" (Verdi, arr. □ Mark 5 Series 2 S. Rhodes): "Tannhauser Grand March" Tick os required (Wagner, arr. J. Hartmann); "March From Karelia Suite" (Sibelius, arr. N. Richardson); "Coronation March" RCA OF AUSTRALIA PTY. LTD. (Meyerbeer, arr. T. C. Brown), and An Assocloie Company of Radio Corporaiion of America "Pomp And Circumstance March No. 1 —Land Of Hope And Glory" (Elgar, SYDNEY: 221 Elizabeth Street. 61-8541 arr, Retford). MELBOURNE; 2 Stephenson Street, Richmond. 42-4586 The recording is very good, with low BRISBANE: 173 Ann Street. 2-7884 noise and a very low level of distortion. PERTH: 280 Stirling Street. 28-1459 Recommended for band lovers, then. RC.l I4.I02GA^ (J-R.) Radio, Television & Hobbies, June, 1964 THE KSgT^G,LOF5l!SS AUSTRALIAN FOLK SONGS OrchestraI conducted by Kurt i AUSTRALIAN FOLK SONGS, Don BBurrows and classical bassist s Grmunke.Graunke. Festival 12-Inch stereo, I Volume one and two. Marian Lyn CChristie to accompany Miss ' SFL-931,091. Henderson vocal and guitar with Henderson on the discs and I think ! | Interest: Trumpet solos. Don Burrows, flutes; Lyn Chris- he made a wise choice. These two ;; Performance: Majestic. fie, bass. "Old Bark Hut," work in well with Miss Henderson's Recording; Good, but noisy. "Peter Clarke," "Botany Bay," style, particularly as there was a ;' Stereo Quality: Good. "Springtime, It Brings On The very limited rehearsal time available My colleague Keith Jeffcoat reviewed Shearing," "Euabalong Ball," to them. 11 the mono version of this recording some "Van Diemen's Land," "Waltzing In her rendition of "Van Diemen's time ago, and confessed himself rather Matilda," "Jim Jones of Botany Land" there is a slight tendency to ; j unimpressed with it. As a jazz musician Bay." Pht, Mono. PX-006 and stray from the true notes, but we and a trumpeter he was certainly not PX-007. understand that this number was ■ convinced that Mr Mendez was the Interest: Authentic folk music. recorded at the conclusion, of a tiring !: "greatest trumpeter in the world," nor Performance: Good. session after the musicians had !; was he "electrified" as predicted by the Quality; Good. departed the studio and it is therefore ;; sleeve notes. Marian Henderson has only been unaccompanied in any way. ;' singing folk songs for about two At the price these discs are offered ll Now my knowledge of trumpet-play- years but has already risen to some to the listening public I would con- 1; ing and its difficulties is effectively non- fame in the field, particularly as a sider them to be an excellent bargain ; existent in comparison with that of KJ. performer of authentic Australian and I feel that they could well be- ;; (himself a player), so it would be quite ballads. Miss Henderson has a soft, come collectors' pieces in the realm ; pointless for me to venture an opinion well modulated voice and, from her of authentic Australian folk music. < regarding Mr Mendez' rank in the performance on these new E.P.s, 1 Technically the disc is very good, l! trumpet-playing hierarchy. would say she has a genuine feeling there being only a slight trace of !; As a naive listener, however, I must for her chosen artform. distortion on "Peter Clarke," the in- ;; confess myself somewhat impressed with Well known jazzman Ray Price side track of the first side of Volume * Mr Mendez' playing, although it's pos- ■, chose clarinet soloist and flautist one. (K.W.J.) sible that I would have been just as im- V*********************************** pressed with the same stuff played by fr0ln the original atmosphere and en- someone else. The track which par- vironment. such records turn out to be Popular Jazz Ucutarly took my fancy was the one remarkably un-funny. where Mr Mendez apparently plays with- The opening quips in this perform- RHYTHM. BLUES and BOOGIE out drawing breath for some three or ance, recorded directly from the stage WOOGIE—Hit performances from four minutes—"Moto Perpetuo,'' of the Theatre Royal, Haymarket, Lon- Ella Fitzgerald, Sister Rosetta I don't know how it's done, I'm sure, don, did little to reassure me—so heavily Tharpe, Nat King Cole, Lionel To me it would seem that he must have did they depend on local colour, Hampton, Blllie Holliday, Count either been wearing a diving schnorkel gut the misgivings were short-lived Basle, Louis Jordon and Pete John- r a son. Universal Record Club, Mono. ?both„ blow andtrumpet suck. which Perhaps, sounds as theon an(launchedj> as sooninto theiras Flanders specific andnumbers. Swann I UJ-546. title of the tune suggests, he is a robot fourKi myself laughing along with the Interest: The Boogie Era. and doesn't need to draw breath. Performance: Generally good. original audience. Quality; Variable. The tunes played are "Aria from ImImportant,ortant frfromm the viewpoint of the Tosca'' Moto Pemetiin " "T nnrfnn P . 9 viewpoint of the The roiiing left-handed style of piano derrv ' Air ' ^ev^Hia^ Aria From ^ 5Uyer' ? that the Presentat,ion playing which is a characteristic of 1 pend 18 s ccess on |0 e Tagliacda "Fascinatton" Clavelitos ^il .l " ll ■ 'j ®! Boogie Woogie was originated, so .7o °" „ '' „ tJfvcmos, wh,ch can so easily become stale. Some claim, by the great Tazz pianist, 311 Farewe11 GraniKhfuranaaaGranada (Granadinos)turanaainos).turanadmos).fGranadinnst" Flandersx-iaiiucrsat the grand inm hisinspiano wheel-chairwucci-tnaii are ta|en tedanaand and awannSwann sea- orMeade not Luxis probably Lewis. WhetherWhetfterunimportant, this ISisbut true I lecnmcally the disc is good apart soned performers who can turn music. was a |itt|e surprised to find that Lewis from a rather ngh tape hiss level on monologue, satire and nostalgia to their does not have a place on this disc which some tracks. The stereo is well spread, own ends, with equal facility. features the art of Boogie. The reason for their successful seasons Lewis or not, however, the disc does * * * in London, America and Canada is ap- feature some well-known and very fine MOVIE MEMORIES. Jeanette Mac- parent. performers and the compilers of the al- Donald, Nelson Eddy. Mono, On the technical side, I had reason bum have obviously gone to some trouble H-CXA. Gold Standard Scries 45 for rating the stereo quality as "pecu- to select numbers which were very EP, EPA 5113. liar." During bursts of applause, the popular in their day. > Interest; The performers. stereo spreads the audience across the The numbers featured are, "Swingin^ Performance: Good in its day. room in a most realistic manner, aided The Blues," "Floyd's Guitar Blues, " Quality; Strictly "78" standard. by wide, clean frequency response. But "That Ain't Right," "I StilJ Love You/ For those ladies subject to fits of mid- the performers at times are separated— "Confessin' The Blues," "627 Stomp," thirty nostalgia, Nelson Eddy is present- even dismembered—when they should "Hamp's Boogie Woogie," 'Flying ed in two solos, "Rose Marie" and "The be together and I found myself vaguely Home," "Let It Roll," "Don't ^ Take Mounties." On the other side, the annoyed by the effect. However, while Everybody To Be Your Friend," "Satur- Romeos can listen to Jeanette MacDon- 1 mention the point as a matter of tech- day Night Fish Fry," "Ain't Nobody's aid's "Lover Come Back To Me" and nical interest, don't let it stop you buy- Business If I Do." "San Francisco." iring the record if you feel so inclined. Many of these numbers have been re- But how dated it sounds—the orches- 0(W.N.W.) recorded countless times on various tral accompaniment and the limited r quality of the original 78 r.p.m. recording._ So take my tip; Indulge your nostalgia alone; the children will never understand. (W.N.W.) RCA RED SEAL A ★ AT THE DROP OF ANOTHER HAT. Michael Flanders and Donald SOUND TAPE Swann. Stereo, Pariophone PSCO 3052. (Also available in Mono PMCO 1216.) RCA OF AUSTRALIA PTY. LTD. Interest: Comedy dialogue, music. AN OCIAJI COMPANY OP TMl RADIO CORPORATION Of AMtRlCA Performance: Polished. Thr most trusted name in sound Quality: Excellent. SYDNEY: 7?1 Elizabeth St , 61-8511 Stereo: Peculiar. MELBOURNE: 2 Stepheneon St., Richmond 12-1586 It is with some reservation, these days, BRISBANE; 1/3 Ann St, 2-/881 that I settle down to review a humorous PERTH: 280 Stirl.nf St , 28-1150 record; so often, to a listener remote Radio, Te/ev/i/on & Hobbies, June, 1964 labels, but these are the original hit performances and, as such, they represent a vital cross-section of American popular music and would provide a nostalgic thrill of recaptured experience to those old enough to remember. TV The quality of the disc is, as we mentioned earlier, variable. Many of these numbers were recorded quite a long the best pick-up arm in the world time ago and, as such, could hardly be called "HI-FI." But, in this case, it's the music that counts. (K.W.J.) * ★ ★ ODETTA—ITS A MIGHTY WORLD. "Come a Lady's Dream," "Sweet Potatoes," "Chevrolet," "Love Proved False," "One Man's Hands," "Got My Mind On Freedom," "It's f a Mighty World," "I've Been Told," Mi » "Reminiscing," "Hush Hush Mamie," "Camphorated Oil,'' "Bull Jlne Run." RCA "Dynagroove." Stereo. LSP-2792. Interest: Folk Singing. Performance: First class. ■ss Quality: Excellent. Stereo: Nicely spread. When I first heard Miriam Makeba sing "Forbidden Games" I thought that, in the folk singing field, this would take a lot to top. Listening to Odetta's performance of "Got My Mind On Free- dom" I now feel that Miss Makeba has at least been equalled; and that's saying something. Odetta's career as a folk singer has not been a long one. little more than seven years but, in that time, this unique performer with the powerful, two octave TOATHOWI3HT voice has left many an audience stunned. In this latest release Odetta turns in an absolutely first class performance and iQ y- iry thus provides a recording which js well 10 »)2 worth a place in the library of any folk singing enthusiast. The technical quality is right up to RCA's fine "Dynagroove" standard and the stereo is evenly spread. Balance is > Illustrate^ above Is an amazing ultra excellent. All in all—a fine disc. \ Vv.Tur -\., V 3 Z ^' light shell from S.M.E. weighing only (K.W.J.) \ :V ★ * * 6 grammes, and with 120 peforations. THE GREAT HAMP AND LITTLE _]. h,V - - fA Developed especially for cartridges T. Lionel Hampton and Charlie having a compliance of 20 and upwards Teagarden. Coral, Stereo. SCL- t : '•'£—•—- r,..T^?r and offering a valuable saving in mass 931,163. Interest: Mainstream Jazz. , w 1 V it at the point of greatest effect. Performance: Excellent. a! V r'f ».v S.2.W/9 with companion balance weight Quality; Good. for model 3009 Series II or S.2W/I2 for Stereo: Separation emphasised. Lionel Hampton and Charlie Tea- model 3012 Series II. £4/3/6. S.2. ultra garden are products of the same musical light shell (can only be used with environment and have been pursuing the companion balance weight) £2/4/6. same end in jazz since the late 1920s. In spite of the fact that they have seldom played together, it is therefore not surprising that they manage to create, in this album, a close style which is very reminiscent of the early Benny Goodman Sextet. The numbers played are: "Hamp's Vamp," "Memories Of You," "Silver Slipper," "I Can't Get Started." "410 East," "Dancing On The Ceiling," "Blues For Little T," "September In The Rain," "The Beacon And The Elder," "How High The Moon," "Masked Grandma," Newly ernved and exclusive to Master "Sermonette." sound. The fS.M.E. S.3 ultra-light plastic The style of this group is interesting, headshell is now available for dcmonstattion sometimes exciting, but always listenable (or phone for full details). and in these days of pernicious obscur- antism evident in the playing of many younger jazzmen, it is a pleasure indeed to hear the clarity of expression and communication which these "old timers" can produce. Quality wise it is a good disc, par- I INDUSTRIES, ticularly in the balance achieved between LIDO HOUSE, 400 KENT STREET, SYDNEY. 'RHONE 6X15)27- individual musicians. Worth a place in any jazzman's library. (K.W.J.) Railio, Television A Hobbies, June, 1964

~~I TRADE REVIEWS~~

~~AND RELEASES~~

BRENELL DECKS NOW AVAILABLE FIDELITY Hi-Fidelity tape recording enthusiasts will be interested to learn that R.C.A., Australia, have recently released a range of English "Brenell" tape decks, a unit of which is illustrated below. These decks are the same as U.RaD's "Cadet" used in the Brenell semi-professional tape recorders and have features and a performance that is quite outstanding for the price. HI-FI STEREO nPHE decks are available as two basic \ SYSTEM units—the Mark 5 Series 2 for SJin \ spools and the Mark 510 Series 2 for lOiin \ offers a spools—and each deck can be fitted with f ★ Frequency Range any of six different head arrangements to \ - ^\ suit individual requirements. The unit il- \ ' \ of 40-15,000 C.P.S. lustrated is a Mark 5 Series 2 fitted out \ \ for stereo use with a 2/4 erase head, a 2/4 \ JV > ★ Push-Pull Output. record head and a 2/4 playback head. \ ★ Harmonic Distortion The basic deck is a three motor unit of \ "A 0 Brenell's own design with speeds of 1 7/8, \ m -mt W of only .25 o at 6 watts 3 3/4, 7 1/2 and 15 inches per second. \ ^^0*^ Two interchangeable brass bushes, of dif- \ per channel R.M.S. ferent diameter, are provided for fitting on V ★ Inputs for Radio Tuner the capstan motor spindle, the smaller giving the first three speeds and the larger . , . and Tape Recorder. the last three. A three position speed con- The weight of the complete deck is 1711171b 1 trol on the deck is marked for both ranges, and it is designed to be mounted in theth Other controls include a record/off/ horizontal plane. The faceplate of thetn * THE SYSTEM COMPRISES. playback switch with a safety interlock to model submitted for our reviewv was attract-attracl prevent accidental selection of "record;" a ively finished in a grey vinyl'nyl aluminiumaluminiui 1 - Rogers Cadet Stereo Am- pause button which disengages the tape laminate with impressed black lettennjlettering. from the capstan, a superimpose button Such a panel should stand up well to wearwea plifier and Control Unit. which lifts the tape from the erase head; and tear and would be easily cleaned,cleaned. and a fast forward/rewind switch which can Fitted with suitable amplifiers, the deckdec I-Dual 1009 Auto/Manual be operated only when the R/P switch is in can be expected to give record/replay nre- Transcription player with the centre (off) position. sponse figures as follows: 15 ips., 40 c/sc/ Track sense of the decks is to inter- to over 20Kc20K.C plus or minus 3db; 7 1/1/2 balanced arm and lb. national standards (tape movement left to ips., 40 c/s to 18Kc plus or minus 3dl3db; turntable. right). Wow and flutter figures are as 3 3/4 ips,, 40 c/s to 13Kc plus or mintminus follows; Less than 0.25 per cent at 1 7/8 3db; and 1 7/8 ips., 40 c/s to 6K.c6Kc pitplus ips; 0.15 per cent at 3 3/4 ips; 0.1 per or minus 3db. In our previous checks

TTWfTFfiOT KELLY SPEAKERS SOUND SMOOTH IGNITIONS Mark 14, Breakerless system. Com- pletely eliminates distributor points. • ■i Fits most makes, 6. I2v, + or — earth. £40. Postage 10/. Free de- scriptive literature. imw TRANSISTOR CONVERSION KITS: mm Everything for building conversions. Includes 15 amp power transistor, insulated point kit for + gnd., 30 kv coil and ballast diodes, resistors, heat sink. £18/10/. Post 10/. Separate parts available: Power Transistors, 15 amp, 40/; ballast resistors, i, i or 1 ohm, 12/6 ea; 30 kv ignition coil for transistor, £6/18/. Silicon rectifiers, 18 amp. 200 P1V, 35/ ea; insulated distributor point kits, 12/6; quick connect M. and F. and insulators, 6/ doz. All parts prices post free.

~~QIK FIRE SYSTEMS musm 917-919 Forest Rood Lugarno, N.S.W. 53-9377 Hill -IVJli! IV 1H« 1"~~

~~lABEL X'~~

NEW LONG-LIFE TOOL LINE-UP ^^90^ for £aSy Trimming, Easy Aligning. The newest, toughest injection moulding material, polypropelene, is used to give greater durability to these new JABEL tools. Assembly line tests prove they far outlast ordinary plastic tools.

~~-JABEL WT8-~~

~~WT5~-A double-end tool with moulded-in, non-ferrous tool tips. Blade for all screw-adjusted Trimmers, slotted stem cores, etc., plus slotted tip for all spade- MJ end stem cores. Length 5".~~

SWITCH FROM MSP | WT6—A universal tool for all hexagonal bore cores with long hex and screwdriver blade incorporated for slotted cores, plus i" tip for double-core aligning. Manufacturers Special Products Pty. Ltd. Length 5". has recently introduced a new range of miniature rotary switches, as pictured. Designated type F, the switches have a diameter of 1-5/16 inches and are available in switch contigurations similar to the

~~WTft—A hexagonal socket tool for Philips trimmers etc., plus {" tip for double- core aligning. length 7".~~

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~~WT9—A tool for the miniature slotted cores with phosphor-bronze blade for through- y slotted hole types, plus end-slotted hole types. Length 7". %~~

I| FROM RADIO SUPPLY STORES EVERYWHERE distributedwell known throughtype H. tradeThe switcheshouses butwill en-be .Tax Exempt ' or from FACTORY DISTRIBUTORS quiries may be directed to Manufacturers Special Products Pty. Ltd., 47 York St., WATKIN WYNNE PTY. LIMITED 21 Falcon Street, CROWS NEST, N.S.W. Svdnev. Radio, Television & Hobbies, June, 1964 TRADE-InBrief: TV ANTENNAS ni A series of multi-band television aerials HI f| has been announced by Channel Master Pty. Ltd., suitable for use in all Australian MM capital cities. Designated the "Valiant" series, the aerials cover channels 0, 1, 2 and 6-10. Model 638A is an 8-element unit, 636A a 6-element, 635A a 5-element, while model 310 is a simple 3-element design. The range of aerials and the possibility of "stacking" gives a wide choice for areas of differing signal strengths. (Channel Master Pty. Ltd., 752 Pittwater Road, Brookvale, N.S.W.) PRECISION TAPE RECORDER A new professional tape recorder announced by Ampex is claimed to give the exceptional signal-ratio of 70db, recording full track, on modern tape, at 15 ips. The recorder uses "nuvistor" type valves, of industrial/military grade, which are claimed to have a failure rate far smaller than that of normal valves and half that of germanium transistors. Designated as model MR-70, the recorder can be fitted with different head arrangements and is available with either of two speed combinations: 71/15 or 15/30^ ips. (Ampex Australia Pty. Ltd., 8 th Floor, N.R.M.A. House, 26 Ridge Street, North Sydney, N.S.W., Australia.) BENDIX-TECHNICO Bendix-Tecnico announce the appointment of Mr R. H, Adair as manager and chief engineer. A Bachelor of Mechanical and Electrical Engineering, Mr Adair has held prominent research and engineering posts at Aeronautical Research Laboratories, Mel- bourne, and Weapons Research Establish- ment, Salisbury. Mr Adair was a member of the 1948 Australian Scientific and Technical Mission to Germany, and later became Engineering Adviser to the Scientific Research Branch New from America . . . the V.15 stereo dynetic cartridge with of the British Foreign Office in Europe. bi-radial elliptical stylus, producing sound perfection never heard His appointment adds considerably to the engineering and managerial strength of outside audio laboratories. The unique stylus and 15° tracking Bendix-Tecnico. angle, combine to reduce I.M. and Harmonic distortion to an all OSCILLOSCOPE AMPLIFIER time low! The price at £.47/15/6 is an investment in the extra Sample Electronics Pty Ltd. announce value and finer quality you can expect to receive! the release of the Model 188A Dual Trace Vertical Amplifier for use with the Hew- lett-Packard Model 185A and B Sampling Oscilloscopes. The new ampliler makes it possible to view fast, 90 picosecond rise Radical new M44-5 stereo cartridge, and time pulses without attenuating or disturb- M44-7 for stereo/LP operation are also ing them. available. Both are more suitable for the Both channels of the unit have input budget minded enthusiast, and both feature and output co-ax connectors which allow the new 15 deg. tracking angle stylus to a signal to pass through the units at a constant impedance of 50 ohms. Inside < produce dramatic reductions in l.M. and the unit a high impedance bridging sampler Harmonic distortion. M44—5, £25; monitors instantaneous signal voltage with M44—7, £22/10/-. Still available is the a calibrated sensitivity as high as 1 mv/cm. M7/N21D at £12/15/-; M3D, £12/15/- Both channels have facilities which permit ( the simultaneous observation of signal input and M7D reduced to £10. and output of transmission lines, semiconductors or other devices. For convenient circuit proving, several resistive dividers are available to increase the input impedance. CHOOSE FROM THESE FAMOUS NAMES AT ARROW! The faster than 90 picosecond rise lime of the Model 188A is specified at 100 per AMPLIFIERS: Leak, Quad, Sansui, Pioneer, Trio, Radford, etc. TURN- cent sampling efficiency, but rise times as fast as 50 picoseconds have been observed TABLES: Thorens, Connoisseur, Dual, Labcraft, Sarrard, Goldring at lower sampling efficiencies, permitting Lenco, Orpheus, etc CARTRIDGES: Shure, ADC, ELAC, B & O, Ron- full coverage to 7gc. ette, Sonotone, Goldrinq C.I., Decca, etc. P. U. ARMS: SME, Shure, NEW CELL Thorens, Ortofon, All Balance, B & O, Decca, etc. Union Carbide Australia Limited have recently added a new cell, designated No. LIST ITEMS OF INTEREST AND POST COUPON NOW! 1035, to their already large range of batteries, The new battery is a "C" size dry cell designed for transistor radio and electrical applications, heavy duty torch use, Please supply without obligation slide viewers, motor drive, etc. The cell has similar characteristics to the high details of.. energy Nos. 1015 and 1050 Red-label transistor batteries and offers improved efficiency over a wide range of discharge NAME currents when operated for long daily periods. Retail price is 1/5 each. ADDRESS. Radio, Televition & Hobbiet, June, 1964 MULTIMETER TESTERS EXCLUSIVE TO RADIO HOUSE PTY. LTD. Phone 26-2817 T i 1 . MODEL RH-50 Modern Design, 33 Micro Amp —-x? • ■ c Meter. 30,000 Ohms per Volt D.C. 13,000 Ohms per Volt A.C, 1 p.c. Multipliers and Shunts used. Printed circuit. Clear Scale, rugged moulded case. KEY BEAM SPECIFICATIONS; DC Voltages: 0-0.3-1.2-3-12-30- The amazing lifetime light no batteries or globes 120-300-600-1.200 V at 30,000 ohms per volt. ever required simply squeeze and key beam lights AC Voltages: 0-3-12-30-120-300- your way. 39/- Posted anywhere 600-1,200 V at 13.000 Ohms per volt. DC Current; 0-.06-6-60-600 mA, 0-12 A. Resistance: 0-60K-6M-60M (350. MODEL RH-31 35K, 350K at mid-scale). • 20,0000hms per Volt on DC. Decibels; minus 20 to plus 57 • 10.000 Ohms per Volts on AC. db (0 db equals 1 mW. 600 • 3J" Meter. ohms). MODEL RH.31 • 18 position selector. Audio Out: Capacitor in series SPECIFICATIONS: with AC volt ranges. DC Voltages: 0-5-25-100-500-1000- Short Test: Internal buzzer. ^ HODEL RH.330 5000 ( 20,000 Ohms/V). Accessory: 1 pair heavy test AC Voltages; 0-5-25-100-500-1000 leads. V (10,000 Ohms/Volt). Batteries: 1 (1.5V), 1 (15V). DC Current; 0-50 uA, 0-5-50- Size: 3 5-16in x 6 5-161n x 231n, 500mA. Weight: 1.4lb approx. Resistance: 0-6K-600K, 0-SMeg- SOMeg. £15/10/- including Sales-Tax (30) Ohms. 3K, 30K. 440K at Portage 9/* to 10/- extra. centre scale). Capacitance: IOOuuF-O.OIuF, MULTITESTER MODEL RH-330 0.002uF-0.3uF. RANGES; Inductance: 20 H to 2000 H. DC Voltages: 0-0.6-6-30-120-600- Decibels; minus 20db to plus 1200-3000-6000 V (20.000 Ohms/ 30db In 2 ranges. V). Output Jack: for Audio AC Voltages: 0-6-30-120-800-1200 measurements. V (10,000 Ohms/V). Dimensions: (33" x 53" x 2 3-8"). DC Current. 0-0.06-6-60-600mA. Weight: (23oz approx.) Resistance: 0-6K-600K-6Meg- Complete with internal battery 60Meg. (30-3K-30K-300K at and testing leads with prods. centre scale). Capacity: 0-.00005-0.01uF, 0.0001- £12/5/- including Sales-Tax 0-2uF. Pmtase 5/- to 10/- «lia. Decibels; minus 20 to plus 63 MODEL RH.1U db. MODEL RH-114 £11/17/6 including Sales-Tax AP- MODEL RH.5 4.000 Ohms/V Multimeter Portage 5/« to ID/- extra. FEATURES All 1 p.c. precision resistors. MODEL RH-5 Small and light weight for con- * High sensitivlty-20,000 Ohms/ venience. V DC. 10,000 Ohms/V AC. * 3" Meter. Wide ranges of measurement, with * Handy pocketable size. high accuracy. SPECIFICATIONS; Complete with test leads and DC Voltages: 0-10-50-250-500-1000 batteries. V (20,000 Ohms/V). SPECIFICATIONS AC Voltages: 0-10-50-250-500-1000 Sensitivity: 2,000 Ohms per Volt V (10.000 Ohms/V). . DC and AC. DC Current; 0-50uA. 0-5-50- Ranges; DC Voltage: 0-10-50-250- 500mA. Resistance; 0-10K, 0-100K. 500-1000V, 0-lMeg, 0-10Meg. AC Voltage: 0-10-50-250-5C0- (62 Ohms. 620 Ohms, 6.2K. 62K 1000V. at centre scale). DC Current; 0-10, 0-250 M.A. Capacitance: O.OOOluF-O.OOStiF. Resistance: Ranges Centre Scale 005uF-luF. Decibels: minus 20db to plus 0-20,000 Ohms 200 Ohms 36db in 2 ranges. 0-2Megs. 20,000 Ohms Dimensions: (3J x 53 x 13"). TRANSISTOR HEARING AID Decibes; —20—22db. 20—36db Weight: 15oz approx. (Odb ImW into 600 Ohms). Complete with internal battery, Dimensions: 3i" x 4J" x 13". testing leads with prods. Net Weight: 0.9lbs. £5 including Sales-Tax £9/-/- including Sales-Tax with Lefltheretlc Cute, £6. Portage 5/* to ID/- extra. ** MODEL RH.10 Postage 5/ to 10/ extra.

m T LIMITED STOCK ONLY Thl«»^ Hearing5 Aid isMODEL an ultra-modern FH-2 MODEL RH1D POCKET MULTIMETER unit. It Incorporates the following RANGES outstanding features: DC Voyages: 0-10-50-500-1.000 V at Decibels: —20 to plus 36db. two Compact,Ample power smaller and clearthan tone.a packet of 2.000ohms V ranges cigarettes. AC VoUagcs: 0-10-50-500-1.000 V at Output: 0-1.000 V in four Precision printed circuit design. 2.000ohms V ranges Magnetic earphone. DC Current: 0-500uA 0-500 mA Size: 5ln x 3V6in x I'/iin Separate tone and volume control. Resistance: 0-10 K-I Meg: 60ohms,is. Weight; l3oz approx. Battery used: UM3 or 915 Cvereadv. 6Kohms at centre Packed In a presentation case. scale. Price £5/7/6 ReplacementNew ModelBattery £15/15/. only Sh. 1/3. Capacitance; 250uuF to luF, inin (ndoding Sales Tax. Postage 9/ to Postage Sh. 5/ extra. two ranges 10/ extra.

~~RADIO HOUSE PTY. LTD. 30S-308 PITT STREET, SYDNEY. Also at 7S0 George Street and 4 Royal Arcade.~~

~~92 Radio, Television & Hobbies, June, 1964 AMATEUR BAND NEWS AND NOTES~~

Radio Scheme Rex Black VK2YA: A.O.C.P. Classes Cec Bardwell VK21R: Bulletin International Amateur Radio Union Editor Gerry Sabin VK2AGS; Q.S.L. Officer Sid Molen VK2SG; Country Liaison Officer Frank Pearson VK2ACQ; Disposals By Pierce Heoly, VKIAPQ* Committee Vol. Molesworth VK2VO; Ken Squires VK2SD; Wal Huhl; Registrar War- Probably th« laasi publicised amateur radio organisation is the Inter- wick Johnston; Solicitor Bill Clark. Members attending the general meeting national Amateur Radio Union. But its importance as the representa- of the Division in April had the pleasure tive of all affiliated societies in deliberations on internationad frequency of hearing an interesting and imformative lecture given by Keith Woodward VK2ZAU, allocations is becoming more and more apparent. entitled "Design of Communication Re- 'T'HE first international body of Amateur into closer contact with the Central Admini- ceivers." Radio Operators was formed over 35 strative Council of the International Tele- V.H.F. NEWS years aô, with the expressed purpose of communication Union, enabling "on the The Annual meeting of the VHF and TV exchanging technical information. to spot" representation to be available to Group of the New South Wales Division strengthen the bonds of international express the amateur point of view. was held on Friday April 3. at Wireless amateur radio friendship and to co-ordinate There are, at present, amateur radio socie- Institute Centre 14 Atcneson Street Crows amateur activities. ties in 60 nations who have affiliated with the International Amateur Radio Union. Nest. Since member societies were not as strong They are:—Angola, Argentina, Australia, In presenting his report on the activities numerically or as financially secure as the Austria, Belgium, Bermuda, Bolivia. Brazil, of the Group during the past year the Chair- American Radio Relay League, the govern- Burma, Canada, Chile, Colombia, Congo, man John Lark VK2ZAV, paid tribute to ing body has been situated in the United Costa Rica, Cuba, Denmark. Dominican the work of Bob Winch VK20A who until States. Republic, Ecuador, El Salvaaor, Finland. his death last December had been a leading Due to the expense and the distances France, Germany, Ghana, Guatemale, Hong figure in the activities of the Group. to be travelled, it has not been possible Kong, Iceland, India, Ireland, Israel, Italy, John also reported on the high level of for members to meet around the one con- Japan, Korea, Lebanon, Luxembourg, attendance at meetings during the year and ference table. However, from lime to lime, Malaya, Mexico, Morocco, Mozambique, participation in the various contests organ- regional conferences have been held and Netherlands Antills, New Zealand, Norway, ised by the members during the same period. the problems of that particular group of Panama, Paraguay, Peru, Philippines, He also thanked all who had assisted in nations discussed. Poland, Portugal. South Africa, Southern making it a successful year. However, over the years, there has been Rhodesia, Spain, Sweden, Switzerland, Upon declaring all offices vacant. Pierce little if any need for the I.A.R.U. to "act Syria, U.S.S.R., United Kingdom, United Healy VK2APQ was invited to take the in the political field" for the benefit of States, Uruguay, Venezuela, and Yugoslavia. chair and conduct the election for officers amateur radio. The advantages of having the head- for the forthcoming year, the result of which after ballots for several of the posi- Now, with the ever-increasing demands quarters of the I.A.R.U. in Geneva should tions were as follows:- for radio frequency allocations, views are not be underestimated and every considera- Chairman John Lark VK2ZAV; Secretary being expressed that the headquarters of tion must be given to the best way to Reg Mayall VK2ZRM; Vice-Chairman Hor- the I.A.R.U. should now be transferred to present a case for the retention of amateur rie Lapthorne VK2HL; Committee David Switzerland. frequency allocations at future International MacNaughton VK2ZVW: Tim Mills Such a move would bring the I.A.R.U. Telecommunication Union conferences. VK2ZTM: Paul Jackson VK2ZPJ. The 1963-64 Chairmans Trophy for the highest aggregate points scored in VHF competitions organised by the Group was WIRELESS INSTITUTE ACTIVITIES presented to David MacNaughton VK2ZVW. The 28th Federal Convention of the All proposals in the draft were fully At the conclusion of the Annual meeting Wireless Institute of Australia was held in discussed and - a number of amendments members were treated to an excellent lecture The A.B.C. Studios, Adelaide, over Easter agreed to. A final draft containing these by Dennis Wheaton VK2AWW assisted by weekend, when delegates spent a total of amendments will be submitted to all Divi- Tom Elliot VK2ET, on "Closed Circuit 22 hours at the conference table. sions for ratification. It will be necessary Television." Delegates attending were:— for all Divisions to be in full agreement Using Philips equipment to demonstrate Bill Mitchell, VK3UM, Federal President. before it can be adopted. the operation of such a system, the lecturers Max Hull, VK3ZS, Federal Vice-Presi- Policies relating to the publication of explained the techniques used and how the dent. the institute magazine were reviewed and invention of the vidicon tube had made Jay Lancaster, VK3JL, Federal Secretary. several changes recommended. Matters relat- such systems possible. The use of transistors Pierce Healy, VK2APQ, Federal Coun- ing to the I.T.U. were brought forward has also made it possible for small compact cillor, N.S. W. and it was emphasised that all possible units with greater access for maintenance Michael Owen, VK3ZEO. Federal Coun- steps should be taken to ensure that the and greater stability than that obtained with cillor, Victoria. W.I.A. is represented on committees and valves, to be produced. Peter Brown, VK4PJ. Federal Coun- at such I.T.U. conferences where amateur It was pointed out that Closed circuit cillor, Queensland. frequency allocations are reviewed. It was Television was first introduced as a tool for Geoff Taylor, VK5ZCQ, Federal Coun- also agreed that efforts should be made industry in 1959-60 and its use has extended cillor, South Australia. to strengthen the lies between all I.A.RrU. to many fields in commerce, education and Roy Chamberlain, VK6RY, Federal Coun- member societies in region 3. for general utility. cillor, Western Australia. The Ross Hull Memorial contest and All who attended expressed their appreci- Ted Cruise, VK7EJ, Federal Councillor, the John Moyle Memorial Field Day contest ation for an excellent demonstration and Tasmania. rules were discussed and it was resolved Observers present were:— that members be requested to submit their lecture. Jim Corbm, VK2YC, Keith Howard, views to the Federal Councillors as soon HUNTER BRANCH VK2AKX N S W as possible to enable the Federal Contest The lecturers at the April meeting of the John Batterick, VK30R, Ken Pincotl, Committee to review all. aspects and Hunter Branch were Dcs Mills VK2ZDN. VK3AFJ, Victoria. imjilement such changes as thought desir- Len Daley VK2ZDF and Keith Howard Phill WilUams, VK5NN, John Haseldine, VK2AKX. Len and Des displayed some VJK5C. South Australia. II was also recommended that the next transmitting and receiving equipment for The major item discussed was the draft convention be held in 1965 and the host 432 Mc's, while Keith demonstrated a tran- ,of a new Federal Constitution submitted be the VK4 Division. sistor broad band amplifier for the H.F. by the Victorian Division arising from dis- bands. cussion at the two previous Federal Con- N.S.W. DIVISION It was decided that each meeting in the ventions. The following officers of the New South future would commence with an auction of Wales Division have been appointed for the which members wish to dispose ensuing year. of. This will be held between 8 and 8.30 p.m. •News and notes of Divisional and President Vic Cole, VK2VL; Vice-Presi- and a small commission will go to the dent Ivan Agar VK2A1M; Secretary-Treas- branch funds. Club activities, submitted for in- urer Bill Slorer VK2EG; Minute Secretary The June meeting of the Hunter Branch clusion in these columns, should be Kevin Collins VK2ANY; Communications will be held on Friday 5. in Room 15 forwarded direct to Pierce Healy, 69 officer Chas. Wilkins VK2ALB: Education Classroom Block, Newcastle Technical Col- Taylor St., Bankstown, N.S.W. Officer Harold Burtoft VK2AAH; Youth lege, Tighcs Hill. The lecturer will be Keith Radio, Te/evision & Hobbies, June, 1964 93 Howard, VK2AKX who has chosen for his subject "Top Band Without Tears," being MARCONI VIDIO OSCILLATOR, TYPE TF 885 a discourse and demonstration of easy 25 cjcIes-5 Mcs. Square and sine wave output. methods to gel on 160 metres. Visitors are always welcome to the Hunter This unit cost £250 when new. Our price only £50. In first class Branch meetings. The Hunter Branch news condition. Further particulars on application. broadcasts are made each Monday night, 347- commencing at 7 p.m. E.T. from the official station VK2AWX on 1820 KC, 3395 KC and 144.443 Mc's. Call backs are taken on all bands and reports are always welcomed These units contain 0-10 MA meter, key switch shunts and resistors and should be addressed to;- W.l.A. Hunter Branch Station VK2AWX, Bollon Point, and are housed in metal case with handle. 7" x 5" x 3i". 37/6 ea. N.S.W. CENTRAL COAST SECTION CONTROL UNITS TYPE 383" The Annual Meeting of the Central Coast Section of the New South Wales Division These units contain (2) 10 position single bank. (1) 5 position 3 was held on Friday night, April 24, when the election of officers for the forthcoming bank wafer switches, (1) 8 ohm wire wound pot., (4) knobs. Pilot year was held. Members appointed to the light, plugs etc. Metal box 6" x 4" x 4". 9/6 each. various positions were: President: Alec Swinton. VK2AAK. Vice-Presidents: Maj. Collett, VK2RLJ; Lind- NEW MINIATURE MOTORS say Douglass, VK20N; Harry Crisp. VK2LX; Ern Hodgkins, VK2Etl. Will run on 12v or 24v DC. Size 2i x 2" x H". Ideal model trains Secretary; Reg Brook, VK2AL etc. 25/- each. Ass. Secretary-Treasurer: Perc Day, Assoc. Thirty members attended the meeting and heard a very interesting lecture of "R.F. Pye Reporter Radio Telephones Ex-cabs. Complete with 12 Valves. Currents Around a Modulator" bv Norm Min Types 12V Vibrator. Power Supply, Speaker, etc. Approx. Beard, VK2ALJ. 70 Mcs., suit conversion. £15/10/- each. ILLAWARRA SECTION At the Annual Meeting of the Illawarra Section of the New South Wales Division CLEARANCE OF ODDMENTS held in April the following officers were elected for the ensuing year: CARTON OF OVER £5 WORTH OF PARTS, ONLY £2-0-0. President: Jack Williams, VK2ZCX. Vice-President; Lyle Pateson, VK.2ALU. American Collins Chokes, 4 Henries. High Voltage Plastic CONDENSERS Secretary - Treasurer; Don Reynolds, 350 M.A., D.C. Resistance. 55 Ohms. .02 Mfd. 5,000 DCW 2/3 each VK2ZRK. 22/6 each. Assistant - Secretary: John Simenson, .02 Mfd. 3,000 DCW 2/3 each VK2ANO. METERS .05 Mfd. 3.500 DCW 2/3 each Committee: The above members plus: Paton 0-300 volts A.C. or D.C. Sin .01 Mfd. 5,000 DCW 2/3 each John Doherty, VK2ZBF; lan Hopkins, VK2ZJH: Rodger Evans, VK2ZEG. 37/6 each. 7 Pin Hi Insulation Sockets 9d each. Auditor: Basil Dale, VK2AW. 0-30 amp AC/DC moving iron, 27/6 7 Pin Sockets and Shields. 2/ each. The First Annual Report on the activities ea. 0-50 millamps flush mounted of the Illawarra Section was presented to 5-mill movement, shunted and cali- Tag Strips, 1 doz Mixed. From the meeting by the secretary, Don Reynolds, brated. 4 Tag to 9 Tag 7/6 dor. VK2ZRK. <1 each. TV IF Formers and Can with Tracing the history of the activities since slug 2/6 ea. the reformation of the Wollongong Radio Club was first considered in June, 1962 WELDING ELECTRODES FORMERS. ONLY 1/ DOZ. and the inaugural meeting of the section in 1 mfd 600v Block Condensers 2/6 ea. August, 1962, the report gave a very good Hard surfacing 12 gauge. Bundle of Phone Plugs, P.M.G. type 2/6 ea. picture of how, by the efforts of a few 100, 7/6, or £2/10/ per case of 1,500 2 Phone Plugs with cords 4/6 ea. enthusiasts, the interest in Amateur Radio electrodes. Weight of case 781b. 15 7-pin Miniature Valve Straighteners can be increased. packets per case. 9/6 ea. Monthly meetings have been held regu- Relay counters, 0-9999 7/6 ea. larly throughout the year with an average Box of 20 Asstd. Rectifiers. Ideal for attendance of 19 members. Seven of the Carbon Mic. Inserts 2/ ea. members gave interesting lectures which were Relays, Model Trains, Meters and Bowden Cables, 6ft 5/ ea. very well received and on two occasions Trickle Chargers. SCR522 Circuits 12/6 ea. meetings^ were addressed by visiting Div- Only 17/6, P.M.G. Key Switches. Ideal model rail- sional Councillors. In addition two most way intercoms, etc 2/ ea. interesting evenings were spent as guests 6BY7 Valves 5/ ea. of the Australian Iron and Steel Ply. Ltd. TO CLEAR at their Visitor's Centre. 1200 ohms, 10 watts, W./W. Resistors, A debate on A.M. versus F.M. proved to 9 pin Valve Cans 1/ each 1/ ea. be a most entertaining evening in which Hand Microphone with Press to I.R.C. W/W RESISTORS some strong and, sometimes rather dubious, Talk Switch. 5/ each. advantages and disadvantages for each mode J amp Fuses 2/ per dot 25 ohms, 20 Watts .. . 2/6 ea. of transmission were given. 35 ohm, 5 watt, w/w. Resistors. 75 ohms, 20 Watts .. . 2/6 ea, Apart from the monthly meetings several !/• ea. other functions were organised and members Pots, 120K. 1/6 each 35 ohms 25 Watts . . . 2/6 ea. participated very actively in the 1962 and Pots. 1.00,000 ohms. 1/6 each 50 ohms, 50 Watts . . . 2/6 ea. 1963 Scouts' Jamboree on the Air as well VR92 Valves. 2/ each. 100 ohms, 50 Watts .. . 2/6 ea. as setting up a transmitting station in the Genemotors, input 12V, 1,200V, Illawarra Youth Radio Club's display at 200 MA output. £1/10/ each. 150 ohms, 50 Watts .. . 2/6 ea. the 1963 Dapto Show. Range Finders, £4/10/ ea. • 1,500 ohms, 20 Watts .. .2/6 ea. Two Field Days were held, the first being 12SK7 Valves. 2/- ea. < a Club function at Geroa as a preliminary 6F5 Valves. 2/6 ea. | 2,000 ohms, 20 Watts .. . 2/6 ea. to the First Annual Field Day held on Small Phone Jack, Suit Standard 2,500 ohms, 20 Watts . . . 2/6 ea. November 10, 1963, at the Mount Keira Suit Standard < Boy Scouts' camp. P.M.G. Phone plugs 2/ eaea- 1 5,000 ohms. 20 Watts .. . 2/6 ea. Although not directly connected with the 10,000 ohms. 20 Watts .. . 2/6 ea. Illawarra Youth Radio Club formed at Dapto during 1963 with the assistance of the Dapto Rotary Club, the Section is most ALL ARTICLES PLUS FREIGHT interested in its activities. The Balance Sheet presented with the Report showed that the Section's finances ate in a very satisfactory state tor the PARAGON RADIO first year of operation. The report also expressed thanks to all 479 PARRAMATTA ROAD, LEICHHARDT — who had assisted in organising various activites especially to the lades 560-9402 (TOP TAYERNER'S HILL) 560-9402 for the work done at the Field Days. The Illawarra Sections looks forward to Radio, Teleyition & Hobbies June, 1964 a good year in 1964 both in social get- The activities of Saturday were brought to wood, WIA-L2258, who prepared the draw- togethers and on the air and members are a close with a barbecue. ings of the above items, urged to attend meetings regularly and to On Sunday morning an All Band Scram- Publicity Officer Chas. Aberneathy, publicise the activities of the Section. blc was held. Items of interest on display WIA-L2211 also expresses his thanks for let- The June monthly meeting will be held included a replica of the OSCAR 1 satellite, ters received from Don, WIA-L2022; Sid. in the North Wollongong Technical College VK4DA,s transistorised transceiver, a WIA-L2258; Ross, WIA-L2233/VK.4; Aîwiiivai ">e> « *"•••• noucu up rctcivci, uuuic uum . » on Monday, June 1. trade literature and a SX117 receiver on Lew, WIA-L4020; Bill, WIA-L400I; Allan, A lecture entitled "Amateur Radio in i for VKAWI's use. WIA-L5065 and Ross Beekley, and trusts South Africa" will be given hy Basil Dale, oana disposals auction, presentation of that the replies were satisfactory. VK.2AW. prizes on Sunday afternoon brought to a The Short Wave Listeners Group of the Full details of the Illawarra Section can close a most successful and enjoyable week- Victorian division extends a cordial invita- be obtained from the Secretary. Don Rey- end. tion to all those interested in Short Wave nolds, VK2ZRK, 21 Toorak Road, Wollong- Contest winners were:— Listening to participate in the activities of ong, N.S.W. Amateurs travelling through All Band Scrambles: VK.2ACU and the group. Information can be obtained the area will be made very welcome at VK.4RH. from;— the monthly meetings. Hidden Transmitter Hunt: 1st, VK.4ZAX, Secretary: Ian Woodman, 24 Fewster A note of interest to New Zealand 2nd, VK9ZBV. Road, Hampton, S.7, Victoria. Amateurs is that there are a number of Most Distant Visitor: VK9ZBV. Meeting Place: w.I.A. Rooms, 478 Vic- very keen and active VHF operators around Best Home Built Equipment: Ken toria Parade, East Melbourne. the Wollongong area, the location of Tele- Chiverton. Date and Time; Last Friday of each vision station 5A which is being heard AR7 Receivers: VK4VS and VK4HD. month at 8 p.m. across the Tasman Sea and can be used Also a number of prizes provided by _r_. ______as an indication of band conditions on VK4LT were presented to the ladies and OSCAR PROJECT 144 Mcs. children. The replica of the Oscar I satellite which CANBERRA SOCIETY The Divisional Council and organising was pictured in the April issue of the tu_ „f ,1.. committee were very appreciative of the notes, created a high level of interest among Radio Society held over Easter was voted donations ot Prizes made by a number of amateurs and general public. In addition a great Success bv all those who attended Brisbane houses, among whom were A. E. to displays in business houses of several Th^rt Jill-, thirtu thr^» amateurs nraspnr Harrold, Chandlers, C. A. Pearce, Mullard capital cities, pictures appeared in a number 1 35? iS'affsst'aars.saa -««"«-tas ol stsrs' Saarja Tnetk- first event______, was a mobile contest for SHORTWAVE LISTENERS reels being featured on several television news- T^wa^wo^b^ ^"(^le8 VK2VL Satur- At the annual meeting of the New South Tlie OSCAR experiments although pion- day was organised so that events would Wales divisions'Short Wave Listeners Group "J'd ^ êrican amateurs is not an exclu- take evervbodv out to the delightful Cotter held in April, the following members were sive United States program. Other Oscar Dam. Reserve for a picnic lunch.... electedTkrAc.el ax** to office for the ensuing 12 months, satellitesamatjaiir rvroonicatirvneare being designed tn and built

TRANSMITTING TUBES OV06/40 ...... £4/17/6 OOE03/12 ...... dei/io/- 6146 ...... «3/I0/. 4-250A ...... AS/'/- 4-125A ...... £4/./. 3B29/829B ...... £2/10/- 833A .. .. . £17/10/- TRANSISTORISED AUDIO AMPLIFIER 2W Output Impedance 3.2-4-5 Ohms. Voltage^ 4V6 to 12 volt. Dlmensioos 3%in x 2Jn x %in. Can be used as: Octal bakclite 1/6 PA. SYSTEM. EF50 1/6 SIGNAL TRACER. Large 5-nin ceramic (807) 2/6 INTER COM. Large 6-pin ceramic 1/6 STEREO AMPLIFIER. Large 7-pin ceramic 2/6 STEREO CONVERTER. VCR97 CRT sockets 10/- COMPLETE WITH INSTRUCTIONS. £7/10/0 inc. tax VARIABLE CONDENSERS CERAMIC OA In shaft) | ROSLAN SPECIAL 4/60pF .. .. IS/- 10415 1 gang.. 25/- EMPTY TAPE SPOOL. 9lpF 28/-I1 10 415 2 gang.. 32/- 7-Inch .. 5/. 25 x 25 Butterfly 30/- 10.415 3 gang.. £1 3-Inch .. 3/- OR IN PLASTIC STORAGE CASE 7-Inch .. 11/- "SCEPTRE" 2 Transistor 5-inch .. 5/* METERS Pocket Radio PRICES INCLUDE SALES TAX. (2 Transistors. 1 Diode) MRIP 0-1 Ma. Complete with Bulit-in 2-inch Speaker, Telescopic Clear plastic case, Aerial. Earphone, 216 9-volt Battery and Plastic SOLDERING IRON ivain Square Carrying case. Well known make. tin hole .. 32/6 Six Second, 3 volt, Push-button Type. VR3P Vumeter -20 +3db. clear plastic. 3in Ideal Gift £5 inc. tox. Screw In Tips and Elements, 39/6, clear face, IViin hole 45/- Or Complete with Transformer, SR2P Signal meter, calibrated 9/30db. clear VERNIER DIALS T-501 £4/5/- plastic. Few only 45/- Ratio 8 to I reduction, 1 >/5 inch dlam., scaled VR3P Vumeler —20 +3db, clear plastic, 31n VALVE CAPS SOLDER x S'Aln square £3/17/6 0-' Q Price; £1 inc. tox 807. 4/3. Reslncore 40/60. VR65 Vumctcr -20 +3db, black bakcllte case, 866. 4/3. lib packet, li/. 3In square £4/2/6 M065 0-1 Ma. 3V^1d round, black bakellte VARIABLE CONDENSERS FERROCART case 35/ 1-UP 10 to 365 pF. Ideal for crystal set. M065 0-50 Ma. DC 3V^in round Bakcllte POCKET MULTIMETER case 37/6 10/- Model PT34 M065 0-150 Ma. DC 3Viln round Bakellte ■ 300 uA. movement. case 37/6 English P.M. Radio Receiver AC and DC voltatei: M065 0-250 Ma. DC 3Viin round Bakclite Crystal Locked 150 Megacycles. 12 Valves: 0-10. 0-50. 0-250. case 37/6 2-3S4. 4—1T4. 1—IL4. 1—1S5. 4—3V4, 0-500, 0-1,000c. M065 0-500 Ma. DC JIAin. round Bakellte I—DF62 and 12 Mc, Vacuum Crystal, Current ranges (mA.) case .. 37/6 Complete with 12 volt D.C. Power Supply, suit- 0-1, 0-100. 0-500 mA. MR52 0-1 Ma. 2V4in square 2in hole black able for converson to 146 Megacycle. Ohms range: 0-100,- bakellte case £2 New condition Price: £17/10/. OOOohms. MR52 0-100 Ma. "IVtln square 21n hole black Inches. ,, „ bakclite case 63/- Complete with leads. 57/6 DIODES, CRYSTAL SETS IN2I Silicon .. .. 7/6. 3 for £1 No. 19 Mk. 2 (Autt.) EASTERN Germanium radios, complete with JN23 SILICON .. 7/6. 3 for £1 earphone and instructions. OA2J0 Silicon , . .7/6 AWA TRANSCEIVER Model ER22 22/6 OA81 4/6 OA79 4/6 Frequency Range 2 to 8 Megacycles, 15 Valves: Model ER57 12/6 6—6U7G, 2—6J8G, 2—6080, 1—807, 3—6V6G. Model ER87, de-luxe, built-in compass .. 25/* WANTED TO BUY 1—6H6OT, 1—9072. Complete with 12 volt Crystal earphones with plug .. .» .. 6/6 COMMUNICATION RECEIVERS. TRANS- Ocnemotor Power Supply, Aerial Variometer, High impedance headphones. "Q" plus .. 27/6 MITTERS, TEST EQUIPMENT. AMPLIFIERS. and cables. AS NEW CONDITION. Price: Rienaru coil, "Q" plus 12/6 TRANSISTOR RADIOS. TAPE RECORDERS, £10. 5/- packing charge. Egg insulators 9d each SPEAKERS, TRANSFORMERS, ETC.

NEW VALVES AT BARGAIN PRICES 1A3 2/6 10 a £1 5V4G 17/6 6K8GT 12/6 12C8 5/- 1616 20/- | QQE04/20 £3i 1A5 5/- 5 a £1 5Y3GT 13/9 6L7 5/- 5 a £1 12H6 3/6 1625 5/- 5 a £1 I QQV06/40 97/6 1C7 3/- 7 a £1 6A6 7/6 6R7 7/6 12J5 5/- 5 a £1 1626 5/- 5 a £1 1 UL41 7/6 3 a £1 IDS 7/6 3 a £1 6AB7 10/- 6SC7 7/6 12SA7GT 10/- 1629 5/- 5 a £1 IVR53 5/- 5 a £1 1F5 10/- 6AC7 5/- 5 a £1 6SF5 7/6 3 a £1 12SC7 5/- 5 a £ I 2051 5/- i VR100 (6U7) 7/6 1H5 7/6 8AG7 12/6 6SF7 7/6 I2SK7 5/- 5 a £1 5763 28/- i VR102 5/- 5 a £1 1H6 5/- 5 a £1 6AJ5 7/6 3 a £1 6SH7 4/- 5 a £1 12SQ7 5/- 6146 £3/10/- VR103 5/- 5 a £1 1K4 5/- 5 a £1 6AKS 15/- 6SJ7 12/6 12SR7 5/- 5 a £1 6360 £2/10/ VRI36 2/- 12 a £1 IKS 5/- 5 a £1 6AL5 14/- 6SQ7GT 22/- 14A7 3/6 7 a £ I 9004 5/ 5 a £1 VR137 2/6 1IC7 5/- 5 a £1 6AM6 (EF91) 10/- 6SS7 7/6 3 a £1 19 1/6 AVU 2/11 VT78 (6D6) 5/- 1L4 5/- 6B6 7/6 6U8 17/- 30 1/3 EA50 2/- 10 a £ 1 VT127 4/1 1 5 a £1 1LN5 (CV781) 6B8 metal 17/6 6V4 11/4 47 3/6 7 a £ I EC91/6AQ4 10/- VT50I 7/6 3 a £ 1 5/- 5 a £1 6BE6 15/- 6V6GT 16/- 57 4/- ECC35 20/- 6SK.7GT 21/- 1P5 2/- 10 a £1 6BQ5 17/- 6X4 10/- 58 3/- ECH33 20/- 6SL7GT 12 6 1Q5 5/- 5 a £1 6C4 5/- 5 a £ 1 6X5 15/- 717A 7/6 3 a £1 ECH35 7/6 5Z3 17'6 1S2 18/- 6C6 5/- 6Y6 5/- 5 a £1 725A 20/- EF39 5/- 5 a £1 802 20 - 1S5 10/- 6C8 10/- 7A8 2/- 11 a £1 808 10/- EF50 (VR91) 833A £17/10'- 1T4 10/- 6CM5 25/- 7C5 5/- 5 a £ 1 809 £1 and socket 3/6 884 10'- 2A5 7/6 6F6 12/6 7C7 2/- 12 a £ 1 815 15/- EF70 5/- 5 a £ 1 6AG5 5 - 2A6 7/6 6F8 5/- 7E6 3/6 7 a £1 830B 15/- EF72 5/- 5 a £ 1 6NS7 10'- 2D21 12/- 6G6G 7/6 7W7 2/6 10 a £1 866 32/6 EF73 5/- 5 a £ 1 5R4GY £ 1 2X2 5/- 5 a £1 6G8G 26/- 12A6 4/- 6 a £1 954 5/- 5 a £1 EF86 26/- EF74 10 - 3 AS 10/- 6H6GT 3/6 12AH7 5/- 5 a £1 955 5/- 5 a £1 EL41 10/- 6AM5 15 - 3S4 10/- 6J5GT 10/- 12AT7 15/- 956 5/- 5 a £1 EY9I 5/- K.T66 30/- 5U4GB 14/6 6K.7 5/- 5 a £1 12AU7 15/- 958A 2/6 10a £1 K.T6I (6V6) 15/- 5J6 15/-

96 Radio, Television S Hobbies, June, 1964 possibilities of a similar venture is being considered by Australian amateurs. The exact date for the launching of the OSCAR III satellite was not known at the time these notes were being compiled. How- ever, it had been hinted that June or July SCHOLARSHIP AWARD are invited to take advantage of the facilities were now the target dates. A world-wide The Australian Radio and Television offered. network of amateur stations has been organ- College have offered an Annual Scholar- For further details contact the Secretary, ised to relay the latest information and to Westlakes Radio Club, Post Office, Teralba. alert co-ordmators when launching is about ship m the Radio Servicemen's Course for to take place. award to the member of the Wireless Insti- VICTORIA Those interested in Australia are advised tute's Youth Radio Scheme who best meets In the March issue of the Newsletter to to listen to the W.I.A. news broadcasts the following requirements specified by the club members, details were given of a prize each Sunday morning on 7146 Kc. when the Youth Radio Scheme Committee and the to be offered at the end of the year to the latest information will be given. Australian Radio and Television College: most active Transmitting Y.R. Club. The The Oscar III is described as an active 1. (a) Must have been a registered member greatest number of completed contacts made repeater satellite which will! receive and re- of a youth radio club or a registered between Monday, April 6, until Tuesday, transmit signals from ground stations opera- non-club participant for at least December 1, 1964, will determine the ting in the l44Mc amateur band. ONE year; winner. QSO s may be on any band C.W A preliminary version of the Oscar III (b) Must have reached the minimum age and/o r phone, provided that QSO's are satellite is in operation as ground based of 16 years; conducted by club members (not including equipment and experiments are being car- (c) Must have reached an educational club instructors). A complete log must be tried out using amplitude modulation, single- standard equal to completion of forwarded to the Supervisor before the side band and c.w. signals in communica- Fourth Year or Fourth Form at closing date for entries, December 31. 1964. tion through the equipment. secondary school level with passes Oscar III will receive a 50 Kc. segment in the annual examination of at least QUEENSLAND of the internationally assigned 144-146 Mc. 70 per cent in Mathematics 1, Mathe- The first State High School Radio Club band and instantly re-transmit this segment matics 2 and Physics; station in Queensland was put on the air at the opposite end of the same band. (d) Must have gained the Intermediate from the Ciontarf High School on April This means that an amateur station trans- Radio Certificate of the Youth Radio 23. mitting to the satellite on 144.1 Mc. and Scheme with an Honours Grade pass The principal of the school, Mr R. listening on 14S.9 Mc, may be able to in the written examination; Walker, welcomed official guests and communicate with another amateur station (e) Must have submitted constructional parents who attended for the occasion. via the satellite. projects for the Intermediate Certifi- Among the guests were; the Mayor of Red- Both the stations may be well beyond the cate which are, in the opinion of the cliffe, Aid. J. Houghton M.L.A.; the Assist- "radio horizon" in respect to each other Youth Radio Scheme Committee, of ant to the Directory of Secondary Schools, and inter-continental contacts may even be SUPERIOR workmanship and oper- Mr K. Harvey; the President of the P. and a possibility. ating efficiency; C. Association, Mr O'Keefe and Mr Lynagh All licensed amateurs throughout the (fj It is desired that the winner present and Mr Cooke from the Radio Branch, world will have access to the satellite and himself for a personal interview with P.M.G., Brisbane. to the information which can be derived a representative of the A.R.T.C. only In his opening address Mr Walker paid from such experiments. It will be possible if he resides within a reasonable dis- tribute to the Youth Radio Scheme for the for several signals to be passed through the tance of Sydney. It is not required assistance rendered, also to the benefits satellite at the same time, in which case that the winner should travel from to be obtained from the radio club and the peak output power of about 1 watt is the country; a personal letter intro- station. divided beween the number of signals pass- ducing himself will be satisfactory. Mr K. Harvey congratulated the students ing through the equipment. 2. That, if the winner of this Scholar- on their achievement and called upon the In addition to the translatoi equipment ship resides in the Sydney Metro- Mayor, Aid. Houghton, M.L.A., to open Oscar III will carry a 0.01 watt beacon politan area, he will be permitted to the station. Mr Houghton spoke on behalf transmitter operating on 145.85 Mc. to assist undertake his, training course bv per- of the City Council and residents observers to determine when the satellite sonal attendance at the Australian After thanking both speakers the princi- comes into range. As with the previous Radio and Television College; if he pal then introduced the Science Club two satellites the estimated life of Oscar 111 resides outside the Metropolitan area organiser, Mr B. Bolton, and the Radio will be about three weeks. or outside New South Wales, he will Club manager, Mr C. Taylor VK4UC In- be able to undertake the A.R.T.C. troduction of the club's President, Geoffrey MOONBOUNCE Correspondence Course. Johnson, the Vice-President, Joanne Dadson Work on the 144 Mc Moonbounce experi- 3. That the Scholarship shall be awarded and the Secretary, Marguerite Shipman, to ment in Great Britain is reported to be on the basis of the Intermediate those present was made by Mr C. Taylor making good progress under the guidance Radio Certificate during the first year VK4UC, who put the station VK4RP on of Ralph Taylor G2HCJ. and that this condition may be re- the air. A 600 watt 144 Mc transmitter using viewed in subsequent years. Following the initial contact with push-pull 4X500A's designed and built by 4. That, if the Scholarship is not VK4WI messages to mark the occasion were G3KCB is in an advanced stage of con- awarded in any one year, the Scholar- exchanged on behalf of the official guests struction. ship may be carried forward into the and the President and Council of the VK4 The receiver using a locked oscillator following year. Division of the W.I.A. detection system followed by a parametric BRITISH INTEREST SOUTH AUSTRALIA amplifier is being designed by G2HCJ. Latest reports from Rex Black VK2YA A new supervisor for the Y.R.S. in South Plans for the antenna system are at Federal Co-ordinator of the Youth Radio Australia has been appointed, he is Bob present to use circular polarised Yagi arrays Scheme indicates that good progress is VK50D who, for some years has been with a total gain of 20db. The antenna will being made by members of all grades, associated with the "Open Door Radio be mounted on a surplus anti-aircraft gun several being successful in recent P.M.G. Club" which has functioned in conjunction mounting so that it can be rotated in alti- exams. with Methodist Youth work. tude and azimuth in order to track the One note of particular interest is that the moon accurately and automatically. Federal Secretary of the Wireless Institute WESTERN AUSTRALIA of Australia has received a letter from the The appointment of Lawrence Jessop I.T.U. NEWS Radio Society of Great Britain inquiring VK6ZEA has been announced by the West- The celebration of the International Tele- about the Australian Youth Radio Scheme ern Australian Division of the Wireless communication Union's Centenary will take and indicating that a similar project is Institute of Australia, as Youth Radio place in 1965. The Union, which is the being comtemplated in Great Britain. Scheme Co-ordinator in that State. oldest of the intergovernmental organisations In the recent examination two members now specialised agencies of the United NEW SOUTH WALES of the Wesley College Radio Club passed Nations, was founded in Paris on May 17, A new radio club known as the West- their Limited Amateur Operators' Certifi- 1865. lakes Radio Club has just commenced cate of Proficiency. They are Percy Pem- The 19th session of the Administrative activities at their club rooms in Railway berton. VK6ZEP, and Ray Godley, Council, the organisation's governing body, Street, Teralba. Classes for the A.O.C.P. VK6ZEG, also the call sign VK6ZEW has opened on April 6. The session will last examination are held each Wednesday even- been issued to the College Radio Club. five weeks. ing at 7.30. On Saturday afternoons the Full details of the Youth Radio Scheme One of the first acts of the Council was workshop will be open to Youth Radio organisation and activities can be obtained to elect Mr Mohammed Mili of Tunisia as Scheme members and short lectures on from:— its Chairman. It also elected Mr C. ). sections of the Y.R.S. syllabus will be given Lawrence Jessop, VK6ZEA, 17 Victoria Griffiths of Australia as Vice-Chairman. in addition to the practical work. Street, South Perth, Western Australia. Plans are being made for celebrations So far thirteen have enrolled for the CHRISTMAS ISLAND connected with its Centenary. Apart from A.O.C.P. class and there is a small group The Christmas Island Radio Club is these there wilt be the second session of working on Elementary and Junior certifi- now participating in many DX contacts the Aeronautical Conference set down for cate work on Saturdays. The club has been from their club station, VK9XI. February. 1965, and a meeting of the Pleni- issued with the call sign VK2ATZ and The club can be heard on Mondays oper- potentiary Conference, the I.T.U.'s supreme already transmissions have been made on ating around 14100 Kc between 1300 and body, will take place in Montreux, Switzer- 40 and 80 metres. 1500 hours GMT. They are also active be- land, for about two months from September The workshop is well equipped and any tween 0230 and 0600 hours GMT on Sat- 14, 1965. interested persons, whether juniors or not. urdays and Sundays. Radio, Te/eviiion A Hobbles, June, 1964 97 Special Purchase of Manufacturer's stock of Transistors and Transistor Components enables us to offer Transistors and Kit-sets at a fraction of original cost.

Complete KIT for TRANSISTOR i PORTABLE £10/19/6 The complete kit of parts for the transistor six includes six transistors, printed circuit board, coil kit, 4in speaker, Ferguson driver and output transformers, heavy duty battery and all necessary parts to complete the set with full in- M.-ZM structions. Set is housed in attractive plastic case as illustrated. Set can be supplied wired and tested at £2 extra. Dials available for all States. Post and Packing extra N.S.W., 10/; Interstate, 13/.

NEW ENGLISH MAZDA TRANSISTORS PE EQUIVALENT DiKon type SET 123 equlv. OC74 7/« «a. 101 OC45 R.F. Transistor Available In matched pairs at 15/ pair 102 OC44 Osc. Transistor 3 Q AUDIO OUTPUT 10 3 OC 75 Audio general purpose Post and packing on transistors 1/6 any quantity. AeW.A. 23" E.HJe transformers and 23" 110 deg. deflection yokes. New manu facturers stock E.H.T. units 50/-. Deflection yokes 50/-. Post free NEW VALVES AT BARGAIN PRICES •66 115/5/ 12KS 10/ 6X5GT 7/6 EK32 6/9 1K5G .. ., 6H6GT .. . .. 2/6 6SN7 ...... 9 6 5V3GT 9/9 6SA7GT 9/6 1M5G .. .. 6K7GT ,, . .. 7/9 6F6 .... ,. .10 5Z4G 112/62/6 6SH7 5/6 1K7G .. .. 6U7G ...... 5/ 12SK7 ...... 5/ 616 12/ 6CSG . . . . 7C7 ...... 3/6 6B8 .. .. 10/6 IC4 12/7/6 1P5GlOSG 2/6 6SS7 ...... 8/6 VR65A ,. ,. .. 2/6 IT4 4/6 1C7C • .. 3/ 78 .. .. 7/6 7193 ...... 2/ 3S4 110/0/ 6H6 .... 2/6 12AU7 .... , 11/6 12A6 ...... 5/ IA7GT 9/6 ■ ■■ 12SH7 ...... 5/ 1D8GT 9/6 6K7G ...... 4/6 6K8G 955 . . . . 2/6 6SJ7GT 5'J9/6 I Please add postage on all valves. 954 2/6

NEW 4-SPEED STEREO & MONO PUYERS NEW GARRARDC TAPE DECKS AT LESS THAN HALF PRICE AT LELESS THAN HALF PRICE PHILIPS 4-SPEED p 4 6V BATTERY PLAYER ^SINGLEIN(jLt ^SPEED 3 3/4" takes 4" spools. TTwo0 momotors,0 simplified controls, sup- ■■HP Ji MONO £4/17/6 j ^ J f STEREO £5/17/6 i plied with tope £9-19-6. Post & packing Pmi and Packlns. N.S.W. 7/«. Po« A Pacfclnt Interstate 12/4 extra N.S.W. 12/6. Interstate 20/- MITY-AMP NEW PORTABLE RECORD PLAYER S-Transistor amplifier, 2 watt output, 6 or CASES TO SUIT ABOVE TURNTABLES 12 volt innut, 3 to 35 ohm output. Suitable Attractive two-tone cabinet with plastic trim. for record players, inter com, or any appli- Supplied with Sin x 7in speaker in felt-lined enclosure. cation where a small amplifier is required. Space for amplifier and batteries or power supply. Circuit supplied. / 1 5/ Dimensions 15in x I3tn x 7in. Post and Packing 5/. £5/15/- Post and Packing: N.S.W. 9/-. Interstate 12/-. NEW POWER TRANSFORMERS I NEW MIDGET POWER TRANS. 60mA prim.: 240v with 230v tapping Sec. NEW LORENZ ELECTROSTATIC 40mA prim.. 250v. Sec, 225 x 225 with 6.3v 285 x 285 with 6.3v filament winding Fil. Winding. H.F. SPEAKERS Postage: N.S.W.. 2/6{ 60mA., 25/-. Plus postage: N.S.W., 3/6- Z7/0 Interstate, 4/6. Interstate, 5/3. Improveimi the response of your Hi-Fi 30mA 240v Prim. 150 x I50v, Sec. with 6-3v Prim.: 240v. Sec. 385 x 385 at 80 m.A., fil. ean FIL Wladteg. 6.3 and 5v,, 27/6. Post,: N.S.W.. 4/; in- equipmentf,-, with these speakers at a # Postage: N.S.W., 2/6: terslate, 7/6. ™fraction of their original cost. Z^/- Interstate, 3/6. 60 m.A. H.T. Chokes. 7/6. Post: 2/-. *020/- Post and packing 2/-. New Reaistort end Condenaera These new Resistors (mainly l.R.C.) and Con- EXTENSION SPEAKERS MICA AND CERAMIC densers Include many popular values, The ,* * * speaker* In case with volume condensers are paper, mica and ceramic, some control. 75/. rout: later*late. 5/6i .N.S.W., 4/. CONDENSERS are older types and shop soiled. StandardStand Mica Condensers, small current types RESISTORS OR CONDENSERS, 12/6 per 100. NEW MULTIMETER — 61/- 12/6 Postage 1/6. Post and Packing 2, 9 extra. METER 0-JmAPOST 1.000 EXTRA OHMS PER VOLT —— A.C. RANGES D.C. RANGES CURRENT NEW PER-HAG SPEAKERS by Australia's leading Manufacturer 0—I0v o—250v 0—50v o—50Ov AT LESS THAN HALF PRICE rw. cannot odyartlia the name) 0b—250v 500v 0—lOOOvft l IM A (31 in Per Mag 22/6 6in x 9in Per Mag 37/6 0—lOOv • Sin Per Mag 27/6 6in x 9tn Per Mag Hvy. dty. 15 ohm 36/ 0—IOv 0—100MA (Sin x 7in Per Mag 32/6 Sin per Mag 37/6 0—50v 0—500MA | Posf and Pack. 3/6, N.S.W.; Infer. 4/6 Post and Pack. 5/- N.S.W., 7/6 Interstate SUPPLIED COMPLETE WITH TEST LEAD 12 in Per Mag .... 67/6, Post and Packing 7/6 N.S.W., 10/- Interstate. RANGE 0-100.000 OHMS Speaker Transformers for above 6T, 5T or 7T 10/-

~~NATIONAL RADIO SUPPUES 332 PARRAMATTA ROAD, STANMORE, N.S.W. PHONE LM7398.~~

~~98 Radio, Television & Hobbies. June, 1964 SPECIAL PURCHASE OF FACTORY STOCK~~

~~REN COLLARO 2 & 4 TRACK TAPE DECKS~~

These current model 3 speed Tape Decks, speeds 11, 3i and 7i, have provision for third head, spool size to 7", 3 digit counter, pause control, 3 shielded motors. Available in 2 Track or 4 Track with Michigan Heads. 2 Track £19/19/- POST ASD PACKING EXTRA N.S.W. INTERSTATE 4 Track £26/15/- 20/- 30/-

NEW GARRARD RECORD CHANGERS These New EiuliA Camrd Chinscn with Hlfh FMelltr Crystal Pick-ups and Sapphire StyU hare hut been •aperscded. We an ecUlna tame at LESS THAN HALF-PRICE. Available In STEREO at £11/15/-. POST AND PACKING EXTRA. N.S.W. 15/-, OLD., VIC., TAS., 12/«, W.A., S.A., 30/-. NEW ACOS PICK-UP FOR Tin RECORDS HIGH-SPEED 240V. AC/DC MOTORS These new English "Acos" pick-ups are fitted with GP50 crystal can- These 240 v. a.c. or d.c. motors are 1/8 H.P. with a speed of rldges, sapphire stylus and plastic arm with mounting base .. 12/6 7,000 R.P.M. and are ideal for small drills, grinders, etc. Dimensions, SV^ln z 3V*in, with 5/16in; spindle 97/6 Post and Packing 2/-. Post, N.S.W. 5/-; Post, Interstate. 8/6. NEW 4-SFEED STEREO NEW STEREO CHANGER. SLIDER-SWITCHES PLAYER F.O.R £8/15/0 4-SPEED F.O.R. £10/15/0 10 pole 2-way silver plated contacts 3/9 TY6AN AND SARLON SPEAKER GRILLE FABRIC LEADER SIGNAL GENERATOR ISG11 54in wide. List price 60/- per yard. To dear at 30/- per yard. mov a.c. operated. « band uokc to 3»e Poetasc and packlne N.S.W., 3/«i lulentnta, 4/«. pott' N^S.w"'Vi' Interttele Il/«. £16/15/- BATTERY CHARGER RECTIFIERS New Sclcnlan ReetMen, i or 11 rolt, nt 4 amp., 37/5. Post, NJ.W., l/i Inter- NEW 240V. A.(. MOTORS ■tate. V, Transformer tor a bore rectifier tapped for f or 11 rolt, with clrealt lor chancr, 47/5. Poet, N.S.W., 7/t! Interstate, 10/. These small motors, size 3in z 3in z 3V41n. are 1-12 h p. Aa aborc, t or 11 t., at 1 amp, 17/<. Post, N.S.W., 3/61 Interstate, 4/0. Trans- but are only suitable foe intennlttcnt use. 19/4, Poet former for aborc. 37/5. Posit N.S.W., 3/6i Interstate. 4/5. N.S.W. 3/6. Int. 5/. NEW A.W.A. OAK SYNCHRONOUS VIBRATORS, T-pUw 4r. 7/6. NYLEX HOOK-UP WIRE, slnsle .525. 14/ Per 155 yards. Poet and Packing 2/. Post N.S.W. 5/i laterstata 7/5.

SCOOP PURCHASE OF POTENTIOMETERS NEW ELECTROLYTIC CONDENSERS RESISTORS AND CONDENSERS AT LESS THAN HALF PRICE We hive purchased the tesisloi and condenser stock held by Bush- Simpson who have ceased the manufacture of TV and radio equipment. The resistors are mainly I.R.C. and include most standard raluea from 100 mfd 400v 9 200 ohms to 5 mes in Vi, I, and 2 watt. Also some wlra wound. LM price £4/15/ per 155. 70 mfd + 30 mfd 400v 9 The condensert are In most popular makes and Iscluda mica eertmle, paper and electrolytic In most popular values. 100 mfd 4- 200 mfd 350v 11 TOST LM price £5/10/ per 155. The potentiometere are all current types and Include awiteb pott and 50 mfd 12v 1 EXTRA dual concentric. List price £5 per doien, SPECIAL PRICE FOR ABOVE 64 mfd 350v 7 Resistors or candcnsen In boxrs of 155 mixed v elites 25/ Post and pack! us 1/5. 16 mfd + 8 mfd 300v W 7 Potentiometers, 15/ per dor. Post and packing 2/5.

Imported National Transistorised Shoulder Megaphone TWIN TELESCOPIC TV AEKIAIS These shoulder megaphones manufactured by National Radio Japan have an Extends to 36in each section output of 4 watts, and are supplied complete with inbuilt horn type speaker, can be used singly for car or batteries and microphone list price £39. portable radio 20/ Special Price £25 Post extra POST FREE.

NEW 15 & 25 WATT P.A. AMPLIFIERS The 25 Watt Amplifier uses 5 valves plus 2 rectifiers including two EF86 low noise valves as microphone preamplifier and two EL34 valves in push-pull output. All amplifiers are fitted with Ferguson output transformers with voice coil tappings of 2 to 15 ohms. The 25 watt amplifier can be supplied with line output trmnafonncr lapped from 100 to 600 ohmg If required at 20/- extra. Inputs provided for microphone, pick-up, and radio with mixing facilities and tone control. 25 WATT £25/17/5 The 15 watt Is as above but using two 6BQ5 valves in push-pull output. IS WATT £15/17/5 Port Extra on 15 Watt N.S.W. 10/ Interstate 15/. IZin speaker for above (10 watt) 67/6 25 Watt by Rail or AJr. Too Heavy for Port. Crystal Microphones for amplifier 47/6

~~NATIONAL RADIO SUPPLIES 332 PARRAMATTA ROAD, STANMORE, N.S.W. Phone LM7398~~

Radio, Television & Hobbies, June, 7964 "Gilt-Edge" MONEY BACK GUARANTEE ON ALL GOODS RETURNED UNUSED' Double Centrifugal Supsr Spadoli WRItt FOR A OlSCRIPTIVf CATAIOGUE" I m HIGH VOLUME BATTERY BLOWERS CHARGER KITS direct 95/- 39/- DISPOSALS] Mode by "Leach," Eng- land, 1/5 H.P. totally en- English 240v. Mains Trans- > 'Smith's' ENGLISH "English Electric" closed sealed ball bearing former, English Selenium c >"Jib■ A^t.oi.o>E„obl.»Hc<) Moit o.dc. te .COO 240v. A.C. Mains motor, Rectifier, Wiring Diagram vt AIR COMPRESSORS direct coupled to two 3" Makes a splendid battery H BRISBANE 2A8 Gco.9C S. C... ELECTRIC MOTOR dio. high volume muti- charger for 6v/12v bat- 50 UH ,4 Don.on S. . EoOOod. Voile, £8/10/- vane centrifugal blower teries, Charges at 216 > SCOOP! Terrific British 200lb$. per $q. inch. 3 cu. poses, blowing, forced < MMl ORDERS £5/19/- English Transformer avail- l/i o feet per minute, at 500 to air furnaces, dryers, col- able separately will give u I dept. h 750 RPM. Complete with Fully ballbearing. Totally lecting dust, sawdust, dirt OB pO. Box 165 oil reservoir. 5 ' pulley enclosed. Complete with from sandblast machines 17v., 9v., 5v., at 7Vi amps > CO< I Fortitude Valley, Units are brand newl condenser for starting and many other uses. from 240v. A.C. mains, i 50 BRISBANE, Q'd Ideal far form, factory, under load. Has a shaft Brand NEW1 Manufactur- Brand new! 24/6. | O home, workshop. Com- at both ends. Condenser er's cost £16/10/-. 7Vi amp. Heavy dutyj > Pleas* add pletely guaranteed 3 alone worth £2/10/- As abov« with On* Selenium Rectifier for 17v..i onv excess refunded. Aoylse months. Brond new! Multlvan* Centrifugal 12v., 9v., 5v., 3v., use. j nearest railhead when orderino. Newl 14/6.! < Oovt. cost £25. Ust Prlco £14. ftlowBr Fan 59/6. H Amtrican "General Electric" AIRCRAFT English "Sparry" Famous E.M.I. Ampdcan Air Farcp co AIRCRAFT COMPRESSORS WITH MOTOR 3 SWITCHES TRANSFORMERS TRANSFORMERS VARIABLE « £17/10/- RESISTORS < 7/6 25/- As used in U.S.A.F. Jeh. Very conservatively rated 65/- HasPressure 2 stage to 1,000 compressor lb. »q. inch.with Brand new. Primary 0/200 22/6 JdW 12 or 24/32 V. D.C. built-in at 24v. 35 amps. Has sil- /210/220/230/240/250. Brand newl These were Fixed step. 1 5 position electric motor. Unit complete- ver contacts. Will handle Secondary 6.3v. at 3 made for the British Ad- selector switch contains oSHBSMfee- ly self-contained. Slightly up to 32v. at 50 amps. amps, and 6.3v. at 3 miralty, are tropicolised 13 Deposited Bora Carbon fUwJCJ r used.cost £190.Fully guaranteed. Govt. Brand newl amps. 2v. at 1 amp, for indefiniote storage. Resistors. V5 watt power Primary 10/0/200/220/ dissipation. ll.SKto 1.05 Aircraft Linear Actuators 240 Secondary 300/0/300 meg. Reistonce plus or "HIFt" BATTERIES 8/6 24/32 v. D.C. electric motor. Shaft travels Made at tremendous cost for the R.A.F. "Nickle- 3 inches in either direction in ]5 seconds. volts at 150 MA. 6.3v. at minus—2%. Brand new in Iron" spill proof. Icakproof, last forovcr.3A.H, Has torque of over 100 lbs. in Q£ / 3 amps. 5v. at 3 amps. sealed cartons. livolt. Size 3i" x 1". Terrific for spotlights. either pull or push Oovt. cast £20. U.5. Oovt. cost £22. SAVE UP TO 90% ON GOVERNMENT SURPLUS & OTHER BARGAINS

~~7 KNOWLEDGE THAT HAS ENDURED WITH THE PYRAMIDS~~

"\T THENCE came the knowledge that built the Pyramids and the mighty VY Temples of the Pharaohs? Civilization began in the Nile Valley centuries ago. Where did its first builders acquire their astounding wisdom that started man on his upward climb? Beginning with naught they overcame nature's forces and gave the world its first sciences and arts. Did their knowledge come from a race now submerged beneath the sea, or were they touched with Infinite inspiration? From what concealed source came the wisdom that produced such characters as Amenhotep IV, Leonardo da Vinci, Isaac Newton and a host of others? Today it is known that they discovered and learned to interpret certain Secret Methods for the development of their inner power of mind. They learned to command the inner forces within their own beings and to master life. This secret art of living has been preserved and handed down throughout the ages. Today it is extended to those who dare to use its profound principles to meet and solve the problems of life in these complex times. A Secret This Sealed Book —FREE Method For Has life brought you that personal satisfaction, the sense of achievement and happi- ness that you desire? If not, it is your duty to yourself to learn about this rational method of applying natural laws for the mastery of life. To the thoughtful person it is obvious that everyone cannot be entrusted with an intimate knowledge of the THE mysteries of life, for everyone is not capable of properly using it. But if you are one of those possessed of a true desire to forge ahead and wish to make use of the subtle influences of life, the Rosicrucians (not a religious organization) will send you A MASTERY Sealed Book of explanation without obligation. This Sealed Book tells how you, in the privacy of your own home, without interference with your personal affairs or manner of living, may receive these secret teachings. Not weird or strange practices, but a rational application of the basic laws of life. For your complimentary copy OF LIFE address your request to; Scribe L.C, L.

SBe Rosicrucians (AMORC) 54 Customs St.. AUCKI.ANI3, N.Z, Radio, Television & Hobbies, June, 1964 LISTENING ABOUND THE WOBLD Art Cushen's month/y report on * long-distance short-wave, television they would revert to the transmission time of 0700-0830 hours G.M.T. for Australia and broadcast band reception. and New Zealand; this will ensure a reliable 4 signal in the winter months. The station is using three frequencies, 9665, 11775 and 17830 Kc. It is hoped readers will find an improved signal on this new schedule and report on their reception to the Swiss Broadcasting Corporation, Berne 16, Swit- More 50 Kw Transmitters For FEBC zerland. HJED ON 4870 Kc Further 50 Kw. transmitters are soon to join the existing transmitters of A new Colombian short wave station, the Far East Broadcasting Company at Manila, for its Gospel programs. HJED. in Cali, has been testing on 4870 Kc in the period 0700 to after 0900; this This was stated by Robort Bowman, President of the FEBC, when inter- new station is relaying the 50 Kw all night viewed in Invercargill recently. Colombian with the same call sign on 820 Kc. It is presumed that, following the tests, TÔW operating some 15 international the lime taken is about seven years to this short wave station will be assigned stations from locations in Manila, reach the low point, the sunspot count its own call but, in the meantime, it is Okinawa and San Francisco, the FEBC should rapidly increase thereafter and reach relaying the programs of the medium-wave plans to extend its activities with new 50 Kw its peak again in four years. station. What is unusual about this new transmitters. At present, their B/C and S/W The sunspot cycle does not always take station is that it is making requests for transmitters range from 1,000 to 100,000 11 years to complete; it has taken as little reception reports in English, as well as its watts, the latter in Okinawa with programs as nine years and as many as 17 years. usual Spanish identification. The station beamed to China. The short wave outlets Listeners will have found that, in the past gives the announcement on the hour; "This are all located in the main short wave few months, DX on the broadcast band is HJED. in Cali, Colombia, Colombia's bands. from North America has not been as good most powerful station. We would appreciate Mr Bowman told us that negotiations as in the period of higher sunspot activity, reports on the reception on 4870 kilocycles have been completed for another 50 Kw so many will be pleased when May, 1965, by letter or postcard and they should be short wave transmitter; it is hoped that passes and signals improve. sent to P.O. Box 1941, Cali'i Colombia." further 50 Kw outlets will be added to The signals arc fair to good, but with some San Francisco for KGE1, with extra units morse interference. also for the Manila location. Notes from readers should be sent to At present, FEBC is operating in 36 ARTHUR CUSHEN, 212 Earn Street, INDIAN FREQUENCIES major languages in the Orient and Latin InvcrcarslII, N.Z. All limes are In Green- Details on the frequencies to be used America. The KGE1 beam is into Latin wich Mean Time and all frequencies in by the new 100 Kw regional short wave America at present, but application has kilocycles. To convert GMT to local transmitters of All India Radio have been been made to the Federal Communications lime, add 8 hours for Perth, 10 hours released and the stations can operate on Commission for the use of KGEI on an for Sydney and 12 hours for Wellington any of the following authorised frequencies: Orient beam. time. Bombay: 100 Kw, 7120, 9550, 11790, Mr Bowman was surprised to sec letters 11830, 11870, 11890. 11950, 15265, 15270, he wrote to us in 1950, when the station 21650 Kc. first went on the air, and verifications on KOL ISRAEL SCHEDULE Madras: 100 Kw, 7260, 9590, 11760, every transmitter of the FEBC. Mr Bowman The transmissions from Radio Kol Israel 11950, 15225, 15380 Kc. remarked that, since then, the mail had in Jerusalem have been supplied by reader Trivandrum: 250 w. 7280 Kc. increased to 10,000 letters each month; J. Bowyer, of Beaumaris, Victoria. The Dharwar: 2 Kw, 650, 7220 or 9570 Kc. about 5,000 of these would come from station is on the air on 9009 Kc and on listeners overseas. The station runs a corre- a new channel of 9645 Kc, with the follow- MIDDLE EAST RADIO spondence course and it has about 5,000 ing language broadcasts: A new 500 Kw high-powered station letters a month from this; since it started, English, 1600-1630, 2000-2030; Yiddish, known as Middle East Radio has com- over 800,000 students have studied by this 0415-0430. 1645-1730; Persian, 1730-1745; menced to operate from Egypt and is separ- method. Roumanian, 1815-1830; Hungarian 1830- ate from the normal United Arabic Republic The station has the unique system of 1845; French,1930-2000. Radio Cairo transmissions. The station is placing small pre-tuned receivers in com- using the Cairo frequency of 818 Kc on munities throughout the Philippines. Some NEW SWISS TRANSMISSION the broadcast band and should be beard 1,428 of these sets, which can only receive Readers will recall that^ for a period last best at dawn; it is anticipated that short the FEBC programs, are located in key year, the Swiss Broadcasting Corporation in wave relays of the program will follow. areas of the 56 provinces, and have an Berne directed their African service simul- The new corporation is operating on a average monthly audience from 60,000 to taneously to Australia and New Zealand commercial basis and will ultimately carry 80,000. In some villages where there is no from 0700 hours G.M.T., with great success. its pan Arab program of light entertain- commercial radio, the listening post is the In our summer months, the normal trans- ment for 16 hours daily. The transmitter only contact with the outside world. Thus mission at 0900 G.M.T. gave reasonable is sited at Mansoura. near Port Said. Middle the P.M. (portable missionary) becomes a reception, but this time of transmission East Rndio commenced operation in April vital link via FEBC. would make reception almost impossible in with six hours of light music each day, The Soviet slopped jamming the pro- the winter months in the South Pacific. but plans a longer schedule after a month grams in Russian some three years ago, Following an appeal to the SBC and, of test programs have been completed. and this seems to have been done without coupled with the fact that reception reports During the lest period, the only announce- any reason. Since then, the Chinese have from Australasia have been poor, the Berne ment will be station identification and a started jamming some of the FEBC pro- station has advised us that, as from May, request for reception reports. grams; the FEBC has over 10 hours of programs each day in its Chinese languages. To add to its work, the FEBC uses recording studios scattered throughout Asia FLASHES FROM EVERYWHERE 1 and, from them, draws much of its foreign PORTUGAL Is reported to be using the bomb-proof cave and the station plans language programs. In India, the FEBC new 9645 Kc. frequency for its home to have transmissions in French and has studios at Delhi and Bangalore; these relays in Portuguese. The station's session English. The present transmissions from are mainly responsible for the 31 hours a in French 1715-1800 beamed to Europe Yemen are from the Sanah transmitters day beamed to listeners in India. Some 15 is now on 6025 Kc; to West Africa 1915- which, though frequently heard in this other recording studios in India, run by 2000 on 15380 Kc; in English to East area, never have been known to verify other missionary organisations, also help Africa from 1800-1915 on 11935; to West the reception reports of listeners. in the preparation of program material. Africa 1800-1915 using 15360 Kc. News PERUVIAN station OAX8Z. Iquitos, with in English on these last two transmissions the slogan "Radio Amazonas," uses 9770 SUNSPOT ZERO is now at 1845 hours G.M.T. Kc and has been heard with weak to According to the predictions of George YEMEN is to operate a new 5,000-watl fair signals at 0300, reports Dick Pollard Jacobs, the Voice of America propagation short-wave station in the 41-metre band, of Nelson, N.Z. The signals from ad- expert, the present sunspot cycle will reach according to a member of the United jacent stations caused rather severe inter- its low in May, 1965. The lower the sunspot Nations Commission who has visited this ference but, in our winter, this signal count, the lower the optimum operating country recently. He reports the Loyalist from OAX8Z should improve. frequencies for short wave stations. Though faction will operate this station from a SWEDEN'S transmissions from Stockholm Radio, Television & Hobbies, June, 1964 101 SOUND PROJECTORS POWER SUPPLY ! 240* AC In 12* DC out 300mA. • VALVES EARPIECES ClneroK Prefect 16mm In good 30mA at 160 volt. Ideal for | High Impedance crystal, ntt MP working order. 240t operated, Tester, £3/|5/0 BRAND NEW sixtor radios, aryatal sets, gig. complete with speaker and ampli- IN CARTONS With ping. fier. Special dlsenunt lor quantity £47/10/- 6SN7GT 615 .. . 4/6 Only 9/11 WALKIE TALKIES 6Y6 . . . 16/- Poet fd. Nine Transistor 27.24 ro/cs, com- 89 6X4 . . 10/- plies with P.M.G. Regulations. 6Q7 6SA7 . . 16/- CIRCULAR SLIDE RULES Ranee IVi to 5 miles. Dim. 6ln x I2SA7 6C8 • . , 7/6 BINOCULARS 3V4tn diameter. Will do tke 3ln x IVÎn, 3 months guarantee. 6H6 6F8 . « . 7/6 PRISMATIC Coated I. mm same work aj the convent lont4 •0 6N7 . . . 16/- Bruod new, Complile wllb com. slide rule. Instruction book In- Only £49/10/0 41 12/6 6R7 . . . «/- cluded. 12/6 cacb. Post 1/-. 5U4G 6L7 , • * 8/- 8 X 30 .... <9 15 0 for set of two 77 7L7 , . «/- 7 z 50 .. .. £13 5 0 Post N.S.W, 7/1 Interstate »/«. VR150-30 16/ S67S . . 2/6 5CP1 QQE04/26 10 x 50 .. .. £13 19 « FIBRE PULLEYS 5FP7 66/. 12 z 50 .. .. £14 9 0 SWITCHBOARD EF50 3/6 12SK7 5/ American (Ball Bearing)J 1%1ii 6U7 VRI120 . 5/ Post.; N.S.W., 7/-I IntenUle. 12/-, dla. Viln shaft 30/ doz. l /4in dla. FRAMES VR103 5/ VR118 7/6 VaIth shaft Steel, ex P.M.G. VH120 VR65 2/6 SPECIAL ARMY RELEASE Height 451n x 271n x 341 n. make 1L4 10/ 6R7GT 5/ 42/- a doz. Meal Test Bench. £5 each. 717A 7/6 6A6 5/ 1 Add Postage. Height 6StD S 25In s 401iio £7/10/ K4C VT4C 7/6 HI*™. J: ca. 5/ cartage to rail. 884 AUS 16/ Freight payable at nearest attended 16 . . . 16/- ALL LENSES Rly. Stn. SYS . . . VU126 16/ "ASTRONOMICAL" QUALITY. REFLECTOR GUNSIGHT 6ACS . . VR116 16/ Contains then* lenses: NIFE CELLS 6C4 . . . •/- US2 7/6 General and Marine 1 Lena lln Focus* IViln dlun. 1.2 Volt fully chargcdr 4in x 3in 6AG5 . . «/- 957 5/ Use 1 Lent 1 11/ 16in Focus, IV. In x lln 4 AH. C.R.O. Tubes suit flying •pot 4 x 40 Genuine UANDLEY, diameter. Scanners. Cost £30. Our Price .. £3/6/* 1 Air-spaced Lens, IViiln dlun. 10/- each 3" CV2184 . . . 22/6 7 x 40 GENUINE OTWAY 1 Filter Lent, 1 CraHeule, 5" FP7 .. . 27/6 ANGLE TELESCOPE. Cost £4f. > Lampboldcr. Post N.S.W,, 2/6. Interstate 3/6. PLEASE ADD POSTAGE Our Price £4/18/6 2.4v 61n x 21a x IV* 10 A.H. 25/. ON ALL ARTICLES. 15 x 40 variable Power Otwgy, 18/6 each 1.2Y, • x 4 x 21b 29 A.H. 39/6. £7/15/- Poet.i N.S.W., 3/-i Interstate, 4/-. Post. N.S.W., 7/; Interstate 9/6. Freight payable at nearest attended Railway Station. HAND MICROPHONES SES With Press-lo-Talk switch. Achromatic, Coated 2 Elemenl 9/6 each Air spaced Unmounted. Pom. N.S.W., 2/4. Interstate, 3/-. 30 Power Coated TELESCOPES Astronomical Quality. Make your own telescope or long- 30 a 40. wltb Tripod focus Camera Lens aad Bare many MOTORS pounds. 24 Volt D.C. 59/6 £4/17/6 Dlun. Focal Length. Vi h.p. £5/13/-. 2V*ln 28in ...... £f/lf/ Ideal for Winches, Boats, etc. 30 m 40. with Tripod 2V*ln 361n £6/19/6 2VMn 481n £7/5/ 60 magnification with a /■/,/ £8/19/6 31n 36in £16/10/ ELGIN & WALTHAM 60mm coated objectiv# kns. ImN SViln 261a £25 with Tripod. ImM 40 x 40 loom (ocwlna. POCKET WATCHES i wllh tripod Post 3/3 extra. Ex L'-S-A. NAVY. £17/10/- 11 Perfect condition. I £13/19/6 £4/10/- each Post 3/6. As Illustrated. (mtj I Poet 9/6. Int. 12/- RECORDING TAPES Post, i 9/6t Interstate, 12/-. SCOTCH BRAND EX WOOMERA PMG TYPE Hcad and breast sets with cord SLIGHTLY USED. TELEPHONES COMPLETE STATION and Plug 17/6 PERFECT ORDER. Standard desk type with magneto Transmitter type 153 Can be used for home video, tape calling device. Range 30 miles. Triephone Magnetos .. .. 12/6 recording equipment, etc. Uses standard batteries at each 300 Watt Telephone magneto bells 10/- phone. Any number can be con- 2 to 20 m/cs. World range. 240 128 sets less valves and Xtals. 2.400ft 12ln Reel Vîn Top Grade. nected together on single line. volt operated. Matching receiver 2/4,5 Mc/s tranocciver .. £5 Cost £75. Our Price £3/15/ roll. Complete with i/i-mllc wire. Post 7/t Interstate 9/6. type ANR101, 2 to 25 m/cs all GENEMOTOR. 6V Input. 400V £11/10/- poir complete with microphone, cables, at 375 M/n output £5/15/- Also same in V4ln. Ideal for pro- <2 TELEPHONE SETS) aerials. Instruction book and all fessional quality audio recording. 3/- curt axe to rail. Freialit pay- spares tested. Cost £2,500. Electro Pusuraatlc Rums, up to 1200fl 71n reel VUn 27/6. Post 1/2 able at nearest attended railway Sell £250 351b sq. In. Small .. .. 55/- 600ft 5ln reel V*\n 16/9. Post 1/2 •tatlon. Large £3/17/6 200ft 31n reel Vtln 6/6. Post 1/ HIGH STABILITY 50 M/a Meters, 3In, flush mount- VAN RUYTEN ing 27/6 PARABOLIC REFLECTORS, 20- RESISTORS Bowden Cable !/• per yard INCH DIAMETER .. £2/17/6 INVERTERS I.R.C. brand new Viw, |w, 2w, 300 OHM TV RIBBON .. 1/ yd. DURAL1UM TUBING. VUn diam. UV D.C. In al 10A. 240 V.A.C. tolerances between I and not ex- 1/- per ft. out at 100W. 50 cycle. Ideal Ham ceeding 5% including 100, 360, CHOKES, 9H, 60 mA .. 9/6 TRANSFORMERS, 240 volt Input. Mobile, Caravan, boat, etc.. for 550, 750, 15K, 22K, 27K, 100K, 7.5Hy 60 mA 9/6 425 Aside 100mA *. .. 32/6 nulling 240 V.A.C. appliances off I80K, 220K. 560K, 820K, ohms. 5H 1.5A 36/- 2.5v at 1.15 A 25/- 12 V.D.C. Radios, Recorders, Usual pnee 4/ each, 90 assorted VIBRATORS, 6 and I2v. 7 and 2.5 2500 INS 25/- Sewing Machines, etc. Cost £40. different values for only 37/6. S'pln 7/6 each. STEPDOWN TRANSFORMER Special, £18/15/- each. AND RECTIFIER UNITS, 140- IGNITION ANALYSER P.M.G. TYPE KEY SWITCHES, UOv, 2A £5 Easily modified to Sin CJLO. up to 8 sets changeover, 4/6 eg. SELSYN MOTORS MAGSUP 10 CHANNEL VHP 240v operated, new and com- P.M.G. TYPE PHONE PLUGS Mk. D 52/6 ea. TRANSCEIVER plete with Instructions, £45 or AND JACKS 4/6 pr. No. 19 2-way radios, complete Types TR1934 AND TRI935 Kit of parts, all new with In- AUTO TRANSFORMERS, 240 to with hand set, power supply, 100-125 Mc/a, 125-150 Mc/s. structions and circuit, £22/10/. 110 volt 500W, £16 leads, etc.. £12/10/-. 20 Volt DC operated. AM Single Dhnensions 19ln x 9ln x 6Viln. 3,000W £17/10/- Meggers, bridge type, complete and Crystal locks both Tx and Rx on tested £37/10/-. same channel. Complete with UNISELECTORS, 4 BANK SPECIAL lucky dip vafrc offer. generaotor THEODOLITE HOMING TYPE 30/- 12 new valves In cartons for Cooke Trough ton and Slmms, Lon- only £1. We haven't got time £16/10/- don. Microptic. Tested. Complete INVERTERS 27v-80v 2KW 2000 to sort them, so you reap the with Tripod and Staff. £137/10/. eyes. benefit. INVERTERS, 26v.ll5v 2KW 400 3BZ A.W.A. Receiver lOOKc to BLACKMAN 11" EXHAUST 3000 TYPE RELAYS cycle £4/15/ 30 M/cs. 6 volt atr tested. £35 FAN P.M.G. 1 Ohm—2,000 Ohm 75 V.D.C. l/2 h.p. 1400 r.p.m. Coils. 12/6 each. motor cast aluminium housing length 24m £7/15/. TELEPHONES Sound Powered. Can be used as DEITCH BROS. Microphone or Receiver. New, BUBBLE SEXTANTS With 50rt cable. Between Crown and Mark 9, £4/15/. Complete with 70 OXFORD ST.. SYDNEY Rilcy Streets, City. carrying use. For aircraft, marine 38/6 pair SORRY NO C.O.D. use, etc. Posl.i 2/6: Intentoto, 4/-.

102 Radio, Television & Hobbies, June, 1964 are on the air to North America, East in Vietnamese at 0930. The new fre- and one lOOKw transmitters. Marconi is Coast from 0100-0215 on 5990 Kx, and quency seems to relay Hanoi in languages delivering one lOOKw each to Bombay, from 1400-1430 on 15240 Kc. The proof South-East Asia on 15245 Kc and is Delhi and Madras; a Swiss company has gram for listeners on the West Coast of a different program than that carried on delivered 20Kw transmitters to Delhi, North America is from 0230-0345 on 15115 Kc. Madras, Vijyawada, Indor, Adjmer, Trichur, 9660 Kc. Services to Mexico and Central DAMASCUS is reported to now have new Patna, a 50Kw transmitter to Trichur and America, 0400-0430 on 5990 Kc; to the frequencies assigned for its short-wave a 200Kw unit to Delhi. Middle East from 1615-1700 on 15240, transmitter of 50 Kw at Sabbourra, and . , and 1600-1730 on 11705 Kc. Recently, jt may use the following frequencies: AUSTRALIA: The 111th commercial the frequency of 5990 Kc. has been 6090 6170/7165, 7240, 9640, 11715, broadcasting station in Australia has been changed and has been replaced by 9660 11820, 11890, 11935, 15240, 15365 and granted authority to operate on 1320 Kc Kc. Sweden's program "Sweden Calling 17745 Kc. At present the station uses with 2000 watts with directional aerials. The DXers" can still be heard on Tuesday 15165 and 17865 Kc. station will be built by Maroochy Broad- at 2000 hours on 11705 Kc, which offers , , ther country with a new high- casting Company; it will be located north best reception of the many times of xlpN s edano transmitter of 50Kw, has been of Brisbane and broadcast from Nambour broadcast. assigned0wer the followmc freauenciev 5970 area- The station will have directional aerials ETHIOPIA station ETLF, The Radio voice 5^ 59*5* 6115! ^ *1 Quency with 3BA; the of the Gospel, has made some changes 17705, 17795 and 17845 Kc. This is re- aerial will be built to limit the radiation in in its services from Addis Ababa and is ported by "World Radio Handbook." tê Ballarat area. The successful applicant now beamed to the Middle East 1430- x01jy0 has made some changes to its ^'LT^ViW a'Cal nfTlSi hours of t0 N ad agas 1 5 ro 0rar rnin a on 9755; to Eastt , Africal f . "L,1600-1730,^?;! ^to schedules.American serviceThe changes 0000-0100 affect which the Northk 30 Pi?oî ra^mina'} 8. a weeK.week Southern and Central Africa 1730-1800 mûtesearher^hanformerlv on 15285 The followingi are new stations which the on 9685 Kc; toi West Africa 1930 to 2000 minutes ear'^r J^ The Korean service Australian Broadcasting Commission will hours on 11820 Kc. ETLF is now also J,M-f200 and the East Asian service commence to operate in the near future: operating a medium-wave station but fre- 1215-1445 are also new transmission 710 kc 4QW St. George area, Qld. quency and power details are not yet times. Radio Japan has announced that 840 kc 6- Esperance, W.A. known. new transmitters are to be added and the 910 kc 4QO Eidsvold area, Qld, GREENLAND is reported to have a new output of some transmitters increased to 1040 kc 2UH Muswellbrook, N.S.W. short-wave station in operation. If present 200Kw. 1550 kc 4QD Emerald area, Qld. tests run satisfactorily and the new sta- HAVANA in its schedule is on the air over The first of these projected stations to tion is put into service next year it Radio Havana. Cuba is on the air to commence broadcasting is 2UH, which is ove 6 LAND■ Pvir-, 9in Southerni 'll country.Africa isBASUTO- another Europef ins Englishth America 2020-2140 in English on 118652050- duewatts to on operate 1040 Kc. from Two this of monththe other with stations 1000 country soon to commence operating a 2150 oron 15135ou Kc; to North America in 4QW and 4QO are known to be assigned broadcasting service. English 0300-0430 and 0500-0600 on 6135 the power of 10,000 watts. The. Esperance LEBANON from Beirut has been heard in Kc; French to Europe from 2110-2140 station is not expected to come into opera- English at 1830 hours G.M.T. on 15290 on 11840 Kc; French to Europe 1900- tion for some months. Kc, but is announcing 11875 Kc. A fur- 2020 G.M.T. on 11865 Kc; French to other session is English has been noted on North America 0430-0500 on 6135 Kc; MAURITIUS-REUNION: The reception 11705 Kc at 1730 hours, according to in Portuguese to South America 2300- of these two countries off the African coast "Sweden Calling DXers." 0000 on 15340 Kc: in Creole to the West in the Indian Ocean is reported to us by NORTH VIETNAM station Radio Hanoi Indies from 0200 0300 on 6060 Kc; in R. D. Hibbett, of Willoughby, N.S.W. The has been noted using two 19-metre band Arabic for Middle East 2030-2110 on two signals are heard at 1700 hours GMT, frequencies at 0900. One is the usual 11840 Kc; Spanish to Near East from Mauritius using 683 Kc, and Reunion on channel of 15115, which has news in 0630-0730 on 6100 and 1900-2030 on 620 Kc. These stations have both been heard English at 0900 and 1000 and a program 11840 Kc. in the New South Wales area at good strength and identified, the Mauritius station closing at 1810 hours. In New Zealand these transmissions are blocked by the European BROADCAST BAND, TELEVISION DX signals at dawn, which seem to be received at better strength than by our Australian INDIA: Stations of the Indian Govern- Raipur 980 Tiruchirapalli 1480 listeners. These two stations should be heard ment radio network. All India Radio, are Ranchi 560 Trichur 580 best in July and August, but in some areas well received on the broadcast band in the Sangli 1250 Trivandrum 660 should be audible throughout the winter early hours of the morning. They carry Sambalpur 860 Vijayawada 840 months. Our reader also reports several news in English at 1530 hours GMT, 9 p.m. Srinagar 1120 Vijayawada 1500 signals from Europe, while the signals from Indian Standard Time, and this is the best Siliguri 1560 Varanasi 1240 Athens on 729 Kc gives good reception at means of identification of the stations. In Tiruchirapalli 940 ' Visakhapatnam 930 1800 hours GMT. European stations arc recent months 15 new stations have come According to the World Radio Handbook, allocated to 9 kilocycle separation as against on the air, while other centres have addit- the Nippon Electronic has contracts with the 10 Kc separation in other pails of the ional transmitters installed to give three AIR for 2 2Kw, 20 IKw, 30 lOKw, 1 50Kw world, programs; these include Delhi, Madras, Cal- cutta and Bombay. Many other towns now have two programs. All India Radio plans to increase power in the case of many transmitters, which • INTEGRATED CIRCUITS should mean the signals should be better • SILICON-CONTROLLED received in Australia and New Zealand. In RECTIFIERS response to several requests we are priming a full list of stations of AIR, location and • GATE-CONTROLLED frequency, as sent to us by AIR stations in SWITCHES recent weeks. NOW IN Location Kcs. Location Kcs. • HIGH FREQUENCY Ahinedabad- Hyderabad 1220 SWITCHING TRANSISTORS Baroda 850 Indor 650 • HIGH FREQUENCY Ajmer 600 Indor 1590 COMMUNICATIONS Allahabad 950 Imphal 1390 AUSTRALIA TRANSISTORS Bangalore 820 Jaipur 1480 Bangalore 610 Jaipur 1290 • POWER TRANSISTORS Bhopal 1520 Jammu 990 The world famous range of Bikaner 1330 Jullundur 710 • MILLIWATT TRANSISTORS Bombay 1040 Kanpur 1440 • SILICON REFERENCE Bombay 1230 Kozhikode 680 Bombay 550 Kohima 1490 DIODES Calcutta 670 Lucknow 1320 (g) • SILICON 2ENER DIODES Calcutta 1540 Lucknow 760 Calcutta 1000 Madras 720 • SILICON REFERENCE Cuddapah 1190 Madras 1420 MOTOROLA Semiconductors STACKS Cuttack 1350 Madras 1550 • SILICON RECTIFIERS Cuttack 965 Nagpur 590 AUSTRALIAN DISTRIBUTORS Delhi 810 Nagpur 660 Delhi 1070 Patna 1500 CANNON ELECTRIC (AUSTRALIA) PTY. LTD. Delhi 1370 Patna 620 Daharwar 1360 Port Blair 1440 58 Cluden St., East Brighton, Victoria For further information , Gauhati 730 Poona 780 Representatives in Sydney, Adelaide, Brisbane, Goa 880 Rajkot 1420 Perth, Hobart and Launceston contact Dept. R29 Hyderabad 740 Rajkot 910 Radio, Television & Hobbies, June, 1964 103 foster dynamic microphones

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Newnes Radio and Television s: FREE Engineers Reference Book f * . . . COMPLETELY REVISED AND EXPANDED ( IFOR IN THIS NEW EDITION many recent developments have been covered for \ M the first time, and numerous sections completely revisod or recost to toke the DAYS, latest techniques into account. For example, the rapid progress and increasing application of semi-conductor devices ore reflected in TRANSISTORS, providing basic^" information on the latest types, Modern semi-conductor opplicotians are discussed in such articles as TRANSISTOR D.C. CONVERTERS, GERMANIUM AND SILICON POWER RECTIFIERS, TRANSISTORIZED BROADCASTING RECEIVERS, SERVICING TRANSISTORIZED EQUIPMENT, ZENER DIODES, etc. The practical use of transistors in modern transmitters is dealt with in the enlarged COMMUNICATIONS TRANSMITTERS section which also includes new material on low power single sideband transmitters, choice of quartz crystals, v.h.f. scatter and meteor burst communication Systems. INCLUDES; Up-to-date advice and information on mm wm —m mm mm mm mmm ma ■ « RADIO RECEIVER INSTALLATION AND SERVIC- I *rT unu, DntT rn,,DnKi t 1 ING • PRINTED-WIRING PANELS • V.H.F./F.M. « AUACT NOWNUW POSTP0ST COUPON TODAY1 ALIGNMENT • DOMESTIC TAPE-RECORDER SER- I TO:—TO;— GEORGE NEWNES (AUST.) PTY. LTD. VICING • TELEVISION RECEIVER INSTALLATION 1 20-22 MARGARET ST., SISYDNEY ^ I Please send me NEWNES RADIOR AND TELEVISION ENGINEERS' REFERENCE BOOK, n^BD c JcDnMAnryrAi D?mrt I TELEVISION ENGINEERS' REFERI p^ni^p miuPMCMT * r^unnc dav xl dec I without obligation to purchipurchase. I will RADAR EQUIPMENT • CATHODE, RAY TUBES • * return it in 8fi daysdovs or send 8/- deposit roe office IONOSPHERIC FORECASTING. I after^"^1;Jl delivery Athen 16Z 'Tl,monthly payments USE — of 10/-, paying £8/8/- in all. Cash price ^ 47 SPECIALISED CONTRIBUTORS in 8 days is £8. K 47 SECTIONS NAME HouseOWNER > OVER 1,800 PAGES ADDRESS Living with parents > SPECIAL DELUXE BINDING OCCUPATION Householder AND TWO BOOK MARKS SIGNATURE Lodging address (or your pai H under 21) Kadio, Television A Hobbies, June, 1964 ANSWERS TO CORRESPONDENTS

unit would be required; we thefore feel that ics. Argument, and Calvin Wallers. N.Z. MONEY it would be somewhat pointless to describe Finally, he submits a couple of quest- a unit at present. tions for the Answer Man. New Zealand readen are partlcuK If and when the price of S.C.R.S falls, We appreciate your comment T.R.A., and larly requefted not to forward we will certainly review the situation. the various authors concerned will be money in the form of poital nofet pleased to learn that you find their efforts or itampi, at these are not ANNIVERSARY ISSUE so enjoyable. The questions you submit will negotiable in Australia. Money H.S. (Essendon, VIc.) writes to congratulate be passed on to the Answer Man for use us on the April issue. He says that he when space permits. orders, either British or N.Z., pro- has bought every issue since Vol. 1 vide the best form of remittance. No. 1 but is concerned about the diffi- SIMPLE TV SET We understand that these may be culty of trying to keep up with "space- V.I. (Dalby, Qld.) asks if we are able to purchased at all post offices for age electronics." supply a circuit for a simple television sums up to 5/-, and may be used Thank you for your letter. We can assure set. Also he inquires re the availability collectively for sums up to £2, for you that you arc not alone in your con- of simple text books. the purchase of circuits, back cern with the aforesaid difficulty; most We presume that you require the circuit copies, etc., in Australia. people in the electronics game feel the same for a 5 or 6-inch television set and we way. This is one of the reasons why we would recommend the unit which was have channelled our editorial content into featured in our August, 1958, edition. This the one broad field even though some television set is based on a larger tube ION PROPULSION design and can be converted for operating readers, like yourself, wish it could have a larger tube when so desired. The circuit is C.O'C. (Bearmarls, VIc.) has seen refer- been otherwise. We will keep in mind your available through our query service. We are ences to "ion propulsion" in a recent suggestion re a photodimer, although it does also able to supply circuits for a large range issue of the magazine, and wonders if not follow that transistors have any special of mains operated receivers and tran- we would explain just what this form benefits to offer, especially as the mains sistor receivers through the query service. of propulsion is based upon. He asks if have to be brought to the exposure light. For books that might assist in your studies we could also say whether any research we would suggest you read through the work has been done on it, or if it is GUITAR AMPLIFIER Book Reviews each month in our magazine. just an untried theory.. D.B. (Adelaide, S.A.) seeks information for As you are probably aware. C.O'C., ions the construction of a 6&-watl guitar AUDIO PROBLEMS are charged particles. Thus free electrons amplifier complete with reverberation. A.C.S. (East Brighton, VIc.) writes for or other sub-atomic particles with electric We have not featured a guitar amplifier to information re relative performances of charge arc ions, as also arc atoms or mole- these specifications in our magazine. How- commercial audio equipment. He would cules which have gained or lost charged ever, if a total output from both channels also like discussion on the use of particles (usually electrons). of 28 walls (real watts, not American watts) different speaker systems with various As they are particles, ions have mass, and would be suitable then we would suggest commercial units. any object which can be arranged to forci- the construction of our Playmaster 102 Unfortunately, we are not in the position bly expel ions in a certain direction will Guitar Amplifier. This amplifier was feat- to debate the pros and cons of commer- experience a force or "reaction" in the op- ured in three consecutive issues, October, cially made equipment. We do not always posite direction—just as with other systems November, and December 1962. have performance figures of these units nor where material is expelled, such as gas have we the opportunity or time to evaluate rockets. The mass of ions is very small, FOR THE SERVICEMAN the performances in pur laboratory. The and even when large numbers of them are A.D.F. (Pennant Hills, N&W.) writes to only guide which the prospective purchaser expelled the reaction force experienced by comment on a recent Serviceman article may use is the figures quoted by the manu- a practical space vehicle is quite small. and to relate some of his own experi- facturer and his own likes or dislikes after But, out in space, only a small force ences in servicing. a demonstration of the equipment. is needed to drive a vehicle, so the ion By and large, any high quality speaker fropulsion system can be quite adequate, Many thanks for your letter and comments, system may be used with an audio system t also has the advantage that it does not A.D.F., and we will pass the letter on to provided it meets the following conditions: require large storage tanks of fuel or the Serviceman for his possible use in a (I) the- impedance of the system must be elaborate firing arrangements. Ions can be future article. In the meantime, we have matcheo to the requirements of the ampli- generated electrically in quite simple "ion ascertained that the brand of receiver you fier: (2) the speaker system must be capable guns," which can be turned on and off with mention was the one involved in the Ser- of handling the output power likely to be the flick of a switch. viceman's case. delivered from the amplifier in the listening Ion propulsion is not just an untried situation. theory, and quite a lot of work has been ANSWER MAN As you suggest, the speaker systems arc and is still being done to develop practical T.R.A. (Seven Hills, N.S.W.) writes to ex- of major importance when setting up a high ion drive systems. The reason that we per- press his appreciation of the magazine fidelity sound system, and many amplifiers haps don't hear of this propulsion system and the standard of articles in recent have been wrongly condemned because of as much as the others is that it is not suit- issues. He also commends such regular a speaker system which has been inadequate able for earth-escape vehicles; it would seem features as The Serviceman, Audio Top- for the job. virtually impossible to lift a vehicle against gravity by ion propulsion. When we slan sending vehicles into deep space, ion propulsion will doubtless be heard of a great deal more. RADIO, TELEVISION AND HOBBIES QUERY SERVICE TO atslst our readers. "Radio, Television and Hobbles" conducts a technical query service. Conditions oovemlng this service are set out below: — SPEED CONTROL UNIT (1) Requests for copies of circuits or technical queries requiring an answer through the D. P. (Caulficld, VIc.) refers us to the de- post must be accompanied by postal note or stamps to the value of TWO SHILLINGS. scription of a speed control unit using Queries not accompanied by a fee will be answered In rotation on these pages. a silicon controlled rectifier, which he amount(2) ofFor data the available2/ fee, varies,we will but supply In nocircuit case data,can Itas Includeavailable, Information from our additional hies. Theto has seen in two different publications. that already published In the magazine. For complicated projects Involving material extracted He suggests that we describe a unit willfrom bemore answered than one more Issue, speedily an extra If feethey may are benot requested. complicated As bya rule,questions requests requiring for circuits the of this type, as he feels that it would attention of technical personnel. be of interest to many readers. relating. (3) directlyThe technical to articles query published service In Isthe aimed magazine. primarily Answers at assisting will be readersolven In Innote matters form We agree that such a unit would be of and only so far as can be drawn from general knowledge of the relevant subject. We interest to readers. D.P., but they would drawcannot specialprovide circuits. lengthy answers,Please noteundertake that the special Inclusion research, of andiscuss extra commercialfee does NOTdesigns entitle or probably lose interest upon learning the correspondents to special considerations. price of the S-C.R. Some months ago we , ji (4) The Editor reserves the right to return query fees or to limit the scope of an were thinking along similar lines to your- Individual reply where It Is felt that a partial answer will be better than none at all. self and inquired regarding the availability our projects,(5) In addition showing tothe the position normal ofquery all holesservice, and chassis cutouts blueprints tor metal-working, are available but for containing most of and cost of S.C.R.s, when we found out no detal.s of wiring, etc. Apart from complicated projects like TV sets and oscilloscopes, most that they would cost about £10 each in 5/blue lor prints a 6ln costx 8ln 5/ glossyeach. print:Original postage photographs 9d extra. of most projects are also available, from this country. should be addressed to the Technical Editor, "Radio. Television and Hobbles." We doubt whether many readers would Box 2728. G.P.O.. Sydney. be prepared to pay this sort of money to debate(7) the "Radio, relative Television merits ofand competitive Hobbles" products.does not dealPrices In and radio specifications components of normerchandise will wo control their small motors or dim iheir must be obtained from our advertisers. lights, particularly if they found that for (8) Technical queries are not answered by telephone. best performance a full-wave two-S.C.R. Radio, Television & Hobbies, June, 1964 105 ********** PHONE

~~★ RADIO LA384B~~

~~136 VICTORIA RD. MARRICKVIUt.SVDNEy. N SW EVENINGS & WEEKENDS PHONE XW5956~~

636 KING STREET, NEWTOWN-LA7008 < y ,Z ■" i - AMPLIFIERS M . if Public Address Ronge •1 %■■■ %i 240v-AC LEADER SIGNAL GENERATOR LSG 11 140v A.C. Powewd. 6 Band. 110 Kc to 390 Mccs. WIDE BAND Provision for Crystal. MINIATURE F.A. AMPTlrTER. An Idval TV Marker G cncrator. OSCILLOSCOPE 15 WATTS OUTPUT. £16/15/- Muldmach Ferguaow O.P. traru Post. NJS.W. 7/6. latcntalc 12/6. . K position, EL.84 output. £ 17/ 15/ . Frequency < bratcd .02 to eles to 75K. Complete with '6 5-i

~~'17/6 ; 107~~

~~Capacity £~~

~~106 Radio, Television & Hobbies, June, 1964 ★ PHONE~~

~~★ 10 LA384S~~

~~136 VICTORIA R'D. MARRICKVIUi.SYONtV.N S*! EVENINGS & WEEKENDS PHONE XW5956~~

~~636 KING STREET NEWTOWN-LA7008~~

PLAYMASTER 2 TRANSISTOR P.A. SERYIGE STATIONS AMPLIFIERS 12V OpmtloD STEREO AMPLIFIERS 2 Channel input, IGNITION ANALYSER with mixing IS ohm onlpui. Push-Pull. 8 Watt, per Channel IS WMt £27/15/- Bass and Treble boost and Cut. 30 Walt £37/15/- Wired and Tested. 50 Watt £42/10/- OSCILLOSCOPE 240 A.C. pin, 12VO operadon Simple to operate, Oulck* accurate visual Indication of condition, rcqulrad, £7/10/- extra. operation and faults In spark plugs, coil points, condenser, gap scttiiigs, 2.8Ui Dual Cone Speakers and etc. Latest American design. Will pay for itself within 1 month on Stereo. 4-speed Player electronic (une-ups. Circuit, operating Just ructions, graphs and ^ f* * t % tT i orderedPI aywhh master this 3.Unit or fauh indications included. / | ^ / >■ £13/18/- extra. S KERS ELECTRONIC 8 w!A MEGAPHONES Wn ^S.-00' WIDE RANGE G.D.O. Clecphone Transistor 15 Ohm Voice Coilt. R.TV, and H. Feb. Issue. Loud Haller, Pistol Grip Megaphone £6/15/- £7/17/6 Douhi, Endc(| Flares. R. TV & H. KITSET £20/5/- SOUND POWERED BATTERY Duolalcral Corerage. Wlrm and Tested .. £26 5 0 Range 400yds. ! £7/5/- £8/15/- line Output Tram formers to suit STEREO TRANSISTOR POWERED n . '"ctfeTirrrs £29/15/ ■ "A. 2ia CAIvtK TAPE-RECORDER national' driver units TRANSISTORED POWERED American Raring. 30 Watts. MARCH-APRIL ISSUE. 1962 SHOULDER MEGAPHONE Voice Coll 16 ohm. Complete kit set as described £25 £10/15/- including Collaro, Stereo Range 800yds. 15 Watt Rating. Weight 71b. £7/17/6 Deck, All complete with Speaker, Batteries. REFLEX HORNS TO SUIT. With latest Michigan Heads Microphone, etc. £ 1 A /If / and required modifications. Pack and Post 12/6. *»IU/ 15/- GUITAR jMiMiiHiUMmiiiMniiiiminmiiiiMimimiiiiiimimimiimiiimimiiimmiiimnmiiinitMiiiimiiiiimiiimiiiiiimfiiii' £95/17/6 StMl Cabinet to St. AMPLIFIERS I WEEKEND - H0LIDA Y - EVENING £8/-/- Wired and Teatcd. Complete In 18-Watt, Two-Channel, with Twin | DEMONSTRATIONS AT COLLAROY Cabinet with Tape. 2 Dynamic Cone Speaker. £25/15/. | | PHONE XW5956 FOR APPOLNTMENT TO TEST STEREO Microphone#, Guaraoteed. 14-Watt. 4 Inputs. Bass and Treble I GUITAR AMPLIFIERS AND TELEVISION. £120 Boost. 2 Twin Cone Speakers. 3 £29/ 15/. 1 TlMllllllltllllMliAU llllfltHIMHIIIIIHIIIMIIilHilillliUIHIIIIIIfM

~~Radio, Television & Hobbies, June, 7964 PHONB~~

~~LA3845~~

mTsTFI36VICTORIA R'D.MARUCKVIUE.SyDNEy.N-8W AND 636 KING STREET, NEWTOWN —LA7008 EVENINGS and WEEKENDS: "KALUA,' Hilma Street, Collaroy Plateau, XW5956 DULWICH HILL. UNDERCLIFFE, EARLWOOD, BUS AT DOOR, STOP No. 42 NEW VARIACS NEW POWER NEW HEADPHONES rOMMIINirATinilK 11?V115v 50 cycle 5 Amp. TDNEW A KlQEnD POWER AA FD ^ 5 ... , « V VrinUlll VMI IwllJ 21 I nlt.v.nlt«. Provide Infinitely variable TRANbrQRMtKbTRANSFORMERS J5 nhmOhm 4.AI 2 A6 2 ,0 260 31 5 an1P, 1100 2 w, A ( 50 ejc,e ri nsirlM 2000 Ohm I 2 6 ^oltaae.a tv 2 to 260 at 5 amp. 1200 240* A.C. 50 cycle primaries. 4000 Ohm 1 5 0 Matt*.wL'?"*** ■ Standard' '* 6.3 filaments. P » ' , Crystal4000 ohm 2ISO 15 0 l\LvLIDFfFIVFD^ 1 Ll\ J £7/10/0 Each I9601960 5" CRO ...... AS 10 Stereo 5 ObmOhm 2 S5 0 o ^ o I 1960 3*'3** tCRO kO A3 IS 0 Slcreo. C'ryvlalCr.v*iul 2 17 6 B.28B.28—CR100 CR100 32? i 315. IS0MA . 17 6 lx»w Impedance 2 17 6 NEW 285 x 285. 300MA Aft 15 0 1 American I^Kiitweighi 12 6 Current Na*.* Recei*er 800* and 170*. JOOinA, ea. ,C7 10 0 , Australian DLR 12 6 6 Band.40 K.C. to 32 Mea. ALOIS LAMPS i 240*.110*. 1.3 K* Auto A 10 10 0 Dynanux Earpieces, pr. 4 6 Variable Sclectisily. 2 K.I. 12V SIGNALLING UMTS 150 x 150* 30i)iA AI 5 0 Post 2 6 pr. 2 I.E. .Slages. Crystal Gate Band Ideal for yachts, etc. A1m> Spot J 125 * 225* 40mA AI 7 6 Spread. New Condition. Airtrsled. Lamps, etc. In transport case*. \ 124V Doubter 300m A2 IS 0 Keuligned 240V A.C. Operation. 130V Doubter 400m A3 S 0 100 NEW ASSORTED £65/-/- £5/7/6 385 x 385, 100 mA A1 17 6 , I ved. Good Condition. vC 1/12/6. j 300 x 300. 80 mA . . AI 12 6 RESISTORS AR7 RECEIVERS Pom. N.S.W. 7/6, Interstate 12/6. ! 12* to 240* Imerter AI 7 6 Mainly I.R.C.,1 ' a, 1.2 Walt. Air-tested. reali«ned. Perfect order. 145* Doubler 4?0mA A3 17 6 ] 04 Values. j ohm. to 10 uiegs. 150* Doubler 450mA A4 7 6 ; £57/10/- Vibrator 220* Doubler 600mA A6 15 0 15/-, Post 2/6 Power Transformers 310 x 310V l70Ma A2 9 6 100 new assorted Condensers MURPHY—B40 6V 300V II9mA .. . t3 17 6 110V Doubler 400 MA . 2 7 6 Paper. Mica. Ceramic Melalcap. 5 Bund 650 K.C. to 30 Virus. 140 V. 12V 325V l2SmA , . C3 17 6 , 25 Values, \.l . operation. Variable %electl*il>. 15 . Post 2 6. Crystalstages. filler.A la*e 2model R.E. stages.receiser. 2 StillI.E. NEW VALVES Inverter Transformers in current use in N"a**. EMellent 6AMS .76 KK32 .15 0 | 6 selectislty ami seiisttMty. Air lested. 6AM6 , 7 6 009 . . 17 6 12V 240 V 60 Wat! A3 7 WANTED \ Kealisned. Perfect order. Circuit 6AI.S .76 EBC33 . . 12 6 32V 240V 60 Walt A3 7 6 Cnmmunicatlnn* Rcceisers. Test 4 hiciuded. 636 7 6 6AG5 .96; 12V 240V 100 Watt A4 5 0 J'1 equipment. P.A, (■ear. f^rae or % «66A 15 0 F-l-91 ,10 0 1 32V 240V 100 Watt A4 ? 0 Small surplus slock. Best pricew. 7 £55 913 . €3 10, F.F73 ,.4 0; Call, write or phone any tinie^ 2 803 «3 EF72 4 0 6 V or I2V Co 140V 40 watt 1 17 6 A.M.R. 101 3A4 . 12 6 EC70 .4 01 A.VV.A. Version o( National H.R.0. 84/6Z4 12 6 2C 26 . 7 61 COSSOR A A.R.7. 41121 4:4 17 6 RK34 7 6 1 RELAYS I2C8 12 6 INS ... 76 DOUBLE BEAM £57/10/- IC6 . .12 6 IC7 . . 5 0 6V, 3-pole Miniature , 15 0 116 12 6 1435 . 5 0 I 1700 SPDT 7 6! OSCILLOSCOPE TELEPHONES 3B7 . . .10 0 IMJ ... 5 0 i 1300 SPDT 7 6 ) Tested. Good Order. iMU- 1 Muciutii. tA/Q/K 3116 10 0 7C5 ... 5 0 500 x 500 SPDT 7 6 ' Hell rlruing callinu. XH/T/O 304TH 4; I 10 0 7W7 ... 5 0 i; 11 *olts DPDT. 5 amp A1 £49/17/6 2050 Cl I2A6 . . 5 0,' 12 roll* DPDT 12 6 1 IK7 . . 9 0 638 . 17 6 ;I lOOpf TX *ar. condenser* .10 0 NEW 639 . . . 9 6 6C8 . . 7 6 ;i 100 to 900 pf 3000*. *ar. 10 0 1 TRANSISTOR POWER 636 . . .10 0 VR69 . 9 0 i! 500 to 2500pr 750*. var. .10 0 ) COMMUNICATIONS 6370 . 7 6 12SK7 ,50 ■ Hi-speed Polarised relay A 2 10 0 i SUPPLIES RECEIVERS KTW62/61I7 7 6 1X4 ... 10 0 | 400 ohm 12 6 12*. D.C. Input. 300*. l5»VIa. IIU ...5 7 6BM8 76 Output + 150s. Output. E.I L. 401 6F6 , 10 0 I2BH7 ..76' Hl-lo Phono Transformers 4. < £11/17/6 4 Band. 500Kc lo 30 Vleirs. EF37 , . . U 6 12Al'7 7 6 ji Hi-*oltage, Lead-thru Insulators 1 t I2v, D.C. Input. 400*. I5«Ma. H.I .O. S, Vleter. N oise I imiler. 5tI4G .12 6 6B1.8 .76;j eachi 15/ dor. Output + 200s. Output. Hand Spread. 140s Ac. 1AG7 10 0 6BX6 .76!i 60pf with Vernier . , , . A1 1 C VT902 , 12 6 R1.27 . . 15 0 I 30pr 10 < £14/17/6 £45/0/0 11.4 . . . . 5 0 1616 . . . 7 6;i1 Throat mikes, new 3 t 28*. Input. 500s. 200Ma Out. E.i.L. 62 A. 6K6 . 7 6 9V4 10 0 + 250*. Output. 4 Hand, Hand Spread. Vmaleiir AVII . . 2 6 9X4 . . . 10 « , £19/17/6 Keceiter. 9 Valses, 550Kc lo 30 6K7I2S37 . . . 129 06 2A3807 .... . Cl4EI !| OIL FILLED 12* or 32* Input to operate IV VIvbs. B.I .O. S. Vl-ler. AM . 12SL7 .12 6 514 , . .10 0 Sets. 150 Walls, 6SH7 . . 4 0 866 . . 17 6 CONDENSERS £72/10/0 47 .. .. 12 6 6X5 .... 7 6 .5mfd 600V 3 i £29/17/6 LAFAYETTE HE 30 843 AI£1 10 0 6SK7 . . 11 6 2mfd 600V 6 < 1619 ... 9 0 6SS7 .11 6 ; Imfd 600V 6 4 550KC lo 30 Vleg. 1619 £1A 1 CV 1136 .76 4mfd 6O0V 6 4 NEW METERS £72-10-0 RK79 .. .10. 10 0 CV 1133 .76 4mfd 2.5K Al 10 1 IOmA centre rero, 3'aln. scaled. 723A . A3£3 CV 1102 . 7" 6 Imfd 3000V ,17 4 lOO-O-IOOmA. 300-0-300mA. E.I.L. STAR 600 VR75/30I .. 19 0 5Z4 10/0 .9mfd 5K, .f 5K. .1 3K AC 3 to 30 Vleu. Double Consersion. RK48A .. A3 6SF7, metal 10/0 .25 4K, .5 2'^K . ea. 15 1 £1/10/- S.S.B, Baud Spread to MIO K.C. 994 9 0 6SC7. metal 10/0 • 4 mfd 3000 I 15 l 10mA scaled 150 0-t50V. Per Baud. VR105/30 , 19 0 6E6. metal 12/6 2 mfd 3000 1 5 1 £1/10/- Ruill-lti Crystal t allbrator. 6AC7 ... 7 6 B29B and 1 mfd 3000 I 0 ( 0-10 amps, 0-500mA. 0-50 solt. 2X2-879 9 0 Socket 2/17/6 1.25 mfd. 6000*. 2 5 4 £225/-/- 6AJ5 ... 9 0 6BY7 7/6 2 mfd. 4000* 1 10 ( £3 each type VR150/30 19 0 1603 .. . - 7 6 2 mfd. 2000* I? 4 G.E.C, 3ln Panel Viountlng. 6" INDICATOR 6SA7, metal 7/6 7N7 . . • , . 7 6 4 mfd. 1500* 15 ( 0 to 90 mA. 12SJ7. metal 12/6 6K6 9 6 I mfd. 1500* 10 I UNITS 76 7 6 i 8 mfd. 600*. 10 i £1/7/6 Crystal eonlrolled I.H.I. 6C6 7 6 I I mfd. 1000*. 10 ( Conserts to 6B8 . . 7 6 Wire Hand < R4>. 12BE6 . . . 9 6 NEW CV63 . . . 7 6 j TBY~ £9-17-6 CV66 7 6 j Transmitter Receivers A.C. D.C. METERS 6SN7 . . . 7 6 ! 20 to 80 Metis. 4" Pair. NEW ROTARY 6SJ7 9 6 BATTERY OPERATED. 0 to 300V, CONVERTERS £1/17/6 160 ssait. 50 Cycle. New £14/17/6 0-60 Amp., 4ln A.C., D.C. 24s lo 32s iupui. Output can be supplied Telephone Amplifiers £1/17/6 for 50-110 or 240* Transistorised. 8-0-8 AMP Centre Zero as required. £6/7/6 GENEMOTORS 23n Moslna Iron Suit radlograius, I V, Tape Input Output Recorders. I luores^'eiit Lights. Post 3/6 12* 604)* 300mA New . . A5 10 4) 15/- NEW C.R.a TUBES ! 12* 500* 350mA . . . . A8 10 0 £19/17/6 3API-906 AI 7 6 I 11, 1100, 200mA . £6 10 0 VERNIER DIALS 12 VOLT UNITS 5BP1 A2 7 6 20-1 RATIO A* abose. Vletered ssilh Field CV1I2 ...... 10 0 ! 24* 250* 100mA New . A2 0 0 Al 2/6 Regulator. VCR97 AI 17 6 24* 940* 200mA New , . A2 15 0 A 1 7, 6 Will operate TV Sets. VC'RSIIB A1 7 6 24* 300* 250mA New . A2 15 « A 1/12 6 VCR 1570 10 0 12* 275* 110mA . . . . A3 15 0 £19/17/6

~~108 Radio, Television & Hobbies, June, 1964 RADIO AND L)V-HwrlV> ELECTRONICS~~

'ubush cd by Focal Press, London STOTT amateur radio studenti receive nd NiEW York, Hard Cover, 81 x the individual guidance of a highly- !£■ IjkI hciSc 997' ireHJCO'enaopc f)iirvru* d*dmvnrjfj qualified radio engineer, and the Course rom 1*€€ bnkal Book and Magazine incorporates the latest advances in the ZOe. 1 95 Swanston Street. Mel- application of electronics to the design, construction, and operation of modern radio receiving apparatus. Mail the coupon for full particulars of the Stott Course in RADIO FOR AMA- TEURS. LSlolls (nrrpsiiondenre Collcqel 159 Flinders Lane, Melbourne; 383 George, St., Sydney; 290 Adelaide St.. Brisbane: 45 Gilles St.. Adelaide; 22 Howard St., Perth. S.A.A. SAFETY CUT HERE AND POST ------TO STOTTS: Please send me, free and without obligation, full partfeulars of your Counte SPECIFICATIONS In Radio for Amateurs. The Standards Association of Aus- tralia has issued a new and up-to- My Name date edition of AS CIOO A p., "Defin- Address itions and General Requirements for Electrical Materials and Equipment," Age < RH664 ) which is the "parent" number in the scries of approval and test specifications prescribing minimum safety requirements, for approvals purposes, TRANSISTOR SERVICE for the design and construction of electrical equipment. ALL JAPANESE MAKES Copies of the revised edition of C100 are now available from S.A.A. REPAIRED offices in the State capital cities and at Newcastle. The price is 17/6 a including . . . copy, with postage 5d extra. Aristone Aurora Belair Berlin Crown Fujiya General Hitachi Kenco Mariner Mitsubishi Nanaola National Nivico Sanyo Sony Spica Standard Sharp Toshiba Yashica We do not sell spare parts

~~PETER G. BROUGHTON 209 George Street, Sydney. Tel. 27-5831~~

Wmmmm TV PICTrRE TUBES! Soft cover, 256 pages, 5i x 8i inches of text material, with pro- fuse illustration. Published by How- I YEAR WARRANTY £6 ard W. Sams and Co. Inc., ct In- dianapolis, Indiana. PLUS OLD TUBE In the hands of a capable repairman, ALU TYPES EXCEPT BONDED AND 27 INCH most motors can be readily recondi- tioned. Quite often, worn and mal- functioning motors can be repaired There Tubes hove all worn ports replaced with new ones quickly and at less than the cost of a (Cathode, Heater, Base, Etc.) replacement. "Electric Motor and Genefator Repair" DUDS WANTED — TOP CASH PRICES PAID is intended as a complete guide for both beginning and practising motor repair All Duds must be under Vacuum and Scratch free. technicians. Chapters on split-phase, Due to shortage of Ouds we cannot ship tuba until Duds are first received. capacitor, repulsion, shaded pole, universal, synchronous, polyphase and DC Add freight when ordering mall motors contain complete details on Send name and address for Price Lht and other Information to:— trouble-shooting—plus repair and rewinding procedures. Additional chapters SURE BRITE PICTURE TUBES on AC and DC generators simplify 198 PACIFIC HIGHWAY, CROW'S NEST, SYDNEY, H.S.W. understanding and repair of these units. The author has given step-by-step in- ENTRANCE ROCKLANDS ROAD. PHONE 92-7743

Radio, Television & Hobbies, June, 796 technician what Citizens Radio is all volume. Owners of older volumes about. From this point the book pro- would, however, find much to interest gresses to the technical specifications the them in the latest edition, since there PRICE'S RADIO equipment is required to meet. was a number of changes made in the BOX 1212 G.P.O., SYDNEY In chapter 3 a resume of receiver and 1962 book and these have, of course, transmitter circuitry is given, including been incorporated in the latest volume. Mail order service for all both valve and transistorised transceivers. Those who have not yet seen a copy A small mention is also made of single of the "Handbook" will find that it con- radio & electrical appliances side band equipment which is now being tains a wealth of useful information including basic fundamentals of radio, SPECIAL THIS HOATH used on the Citizens Band in America. An interesting discussion of antenna constructional details of HF and VHF Japanese stereo headphones types and their capabilities is given in receivers and transmitters, speech ampli- 2 individual ear plugs with 2 chapter 4, while later chapters cover in- fiers and modulators, specialised com- stallation, service and maintenance of munication systems (including SSB), an- separate miniature phone tennas and transmission lines, construc- this equipment. Correct operation, and tion practices, measuring equipment, plugs. 17/6 rules and regulations applicable to this service, are given in the final chapters. power supplies, mobile and portable NOW 10/- equipment, plus some 34 pages of valve While of limited value to the Aus- and semiconductor characteristics. For tralian technician, it is still interesting aspiring amateurs the volume is a must. Radio, Television & Hobbies reading. Our review copy came direct Review copes of the book came direct Transistor ignition system, from the publishers. The American from the publishers and from the Tech- price 2.95 dollars. K.W. nical Book and Magazine Co., of 295 complete kits £17-10-0. Swanston Street. Melbourne. The Aus- tralian price quoted is 51/6. (K.W.J.) Please quote whether POS. THE RADIO AMATEUR'S HAND- or NEG. ground. Individual BOOK, 41st Edition, 1964. Pub- ★ * ★ lished by the American Radio Re- TRANSISTOR S U B S T I T UTION parts also sold separately. lay League. Soft cover, 720 pages HANDBOOK, by Howard W. Sams 61 Inches by 91 Inches of text Engineering Staff, fifth edition, pnb- Model 200H Multitesters. material with both photographic lished by Howard W. Sams and Co.. 20000 Ohms per Volt and diagramatic illustrations. Inc., of Indianapolis 6, Indiana, This latest edition of "The Hand- U.S.A. Soft cover, 128 pages, 81 Price £5-12-0. book" contains substantially the same by 51 inches, containing detail lists information as last year's copy, although of American and Internatkmai tran- All types of radio & Tele- the volume is 30 pages smaller. On sistor types. vision test equipment. Write checking through the book we found This booklet gives a thorough, up-to- that the missing pages all came from date listing of transistor types used both for quote on any test the advertising section, which now con- in America and throughout the world. instrument. tains 80 pages as against 110 pages last It provides easy identification of the year. manufacturer of a particular transistor If your copy of the volume is the and any equivalents that are available. MAIL ORDERS ONLY 1962 or 1963 edition, then there would In section 7 of this booklet diagrams be little to interest you in this new are given for all transistor types listed in the previous pages. The seven sections of the publication are divided as follows: American Low-Power Transis- tors, American High-Power Transistors, Foreign High-Power Transistors, Recom- mended Substitutes and Applications, MORE! Germanium and Silicon Diodes and the .* 1 ' seventh section as mentioned above. This booklet will be an invaluable reference for the serviceman handling various makes of transistor equipment, and faced with identification of transistors used and likely substitutes. Our review copy came direct from LAFAYETTE the publishers. The American price is Msjy. '. 1.50 dollars. K.W.

RADIO CONTROLLED MODELS, by R. H. Waning. Published by Museum Press Limited, London, c" ELECTR0NICS Great Britain. Soft cover, 134 pages, 81 by 51 inches. This book covers the mechanical side MCES Catalog No. 640 of radio control rather well. A small amount of information is given to the MORE THAN EVER BEFORE — the 1964 Every Item is »vailable, some from stock, producing of radio waves, propagating catalogue of Lafayette Radio hlcclronics others for prompt shipment from the U.S.A. Corporation, of U.S.A., is packed with Explanatory memorandum, order forms, and and receiving them. Constructional wise 1.000 s more Interesting items for the showing how to convert cata- very little detail is given and to quote amatcur, hi-fi enthusiast, experimenter, tech- w®h CataiOBUe from the author's preface: "Well over nlcian, hobbyist, engineer, student, service- Thc sma|) charge for the catalogue is to 90 per cent of all radio-control model- man . . . Includes more exclusive LA FAY- cover import duty, postage, etc., and will ling, in fact, is done with commercial ETTE lines . . . fully illustrated. be refunded with an order for £10 or more. equipment — transmitter-receiver sets StND FOR YOUR COPY TODAY! USf COUPON BILOW OR WRITl. and matching actuators purchased from mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmrn* the local model shop —." ■ AEAVCTTE ci Br-TDr-kklir-c division of Electron Tuba Distributors Pty. Ltd. ' We feel the book may be worth a LArATtTTE ELECTRONICS jA WELLINGTON STREET, PRAHRAN, S.l, VICTORIA. J casual glance to help understand the Send GIANT 422 Page 1964 catalogue No. 64f. I eaclose 12/6 br Cbeq./M.O./P.N. I ■ mechanical actuating systems, but is understand 12/6 will be reloaded wilb my first order for £16. I otherwise of limited value. Our copy from Technical Book and Magazine Company Pty. Ltd., 297 Swan- ston Street, Melbourne. The Australian price is 24/3 plus post and package. — K.W. Radio, Television & Hobbies, June, 1964 CLASSIFIED ADVERTISING Advertisements in these columns cost only 5/ per line, each line contains the equivalent of five words each of nine letters. Minimum size of advertisement is two lines. PAYMENT MUST ACCOMPANY ALL ADVERTISEMENTS EXCEPT THOSE PLACED BY ACCREDITED AGENCIES. Your advertisment for the July issue must reach our office before June 9th. Address your advertisement to THE ADVERTISING MANAGER, RADIO, TELEVISION & HOBBIES, Bex 2728, G.P.O., SYDNEY.

~~FOR SALE FOR SALE READER SERVICE~~

ICROG HOOVE Rondex dies cutter with ICROGROOVE discs from your tapes, also Presto head. 50 Watt amplifier, Roja 66 tape copying service. Highest quality discs at KiTWfMAE Country and Interstate enquiries welcomed. vlt»- ffi tone Recording Studios* Box 1S» Post Office, FOR SALE: Back issues R., TV and H., 1939- ma m ■ 1955,IO<< 1/6;I /<• 56-58. 2/;f/. 59

~~TRIO—still the undisputed~~

~~lenders lor wide range,~~

~~quality, design and service~~

TW30. The latest and world's best Twin 12- walt all-transistor 240V-AC and I2-I8V-DC pre-main "solid state" amplifier. Remarkably hum and distortion free, outperforming several existing leading name valve amplifiers. Hear- a ^ ill ^ ••1 ing is believing. Price £122. 22 Transistors and ... UllltH 2 diodes. TW30

iiiiFiiiiiiirinininTr.v.\v.v.v.\v~.v 'iiiiiiiniimumn 11 mir u r.iT.nvm\\\\\\\\\\N W38. AM/AM/FM/SW Twin 14 wall pre-main amplifier/tuner with all attachments for tape recording and record playing. This ever popular Trio model is a fast selling leader in the com- MO >I| Kl . ..•MO-.lv bination amplifier/tuner field. A sure guarantee of excellent home Hi-Fi 19 valves and one Mi «««• diode. Price £129. , \ W38

W50. AM/AM/FM/SW Twin 25 watt pre- , '//i///////iiiiiliiMiininiinv.n\v.v .»\TC3TOW. ' JB main amplifier/tuner with superb .separation, ml/llllllllllitllim 111II11111 i 1111 ; u ' ".uuawwwwwwwv, switching and special features. May.be used ^//////////////////(/uiimiiiiim ■ t n \ wwwwwwwmV with microphones, pickups, tape recorders and extension speakers and additional tuners. Rumble and scratch fillers, hum balancer and loudness control. Beautifully finished, this unit «... -i..,- .i,... has the best appearance of any amplifier in the world. Price £176. 21 valves am' one diode.

. ^ W50 W45A. Twin 18 watt pre-main stereo-mono de luxe amplifier with all tape and other attachments for AM or FM tuners, speakers, earphones. Scratch filter, rumble filter, loudness control, unique balance meter and control. Separate bass-treble controls and single-plug, 5- pin tape recorder record and playback socket % plus additional tape recorder sockets. The very best value-packed amplifier in Australia today & & and still the popular choice. Price £96/10/. 13 valves including 4 x 6BQ5. W45A

~~AVAILABLE FROM ALL HI-FI SPECIALISTS Australian Distributors: BARDSLEY IMPORT TRADING GO. 166 GLEBE ROAD, GLEBE, N.S.W. Telephone 68-1453, 68-4283~~

~~BRISBANE AGENCIES 16 STANLEY ST., SOUTH BRISBANE, QLD. Telephone 4-5466~~

~~Printed end published by Sungravure Pty. Limited, of Mentmore Avenue. Rotebery at Mentmore Avenue. Rotebery. PAGE IV RADIO, TELEVISION & HOBBIES JUNE. 1964~~

~~This A.R.T.C. Success Story Can Be Yours!~~

WHV NOT TAKE 17413 >00 CAN PO THIS BILiS BILLS A-RTC-TCUVISiON COORSe OBACTTCAL WORK ON -ILL HAVE LOOKS LIKE TWERE'O EOLMPMEMT AT THE TO EARN __ _ BE NVORE COLLEGE, BUT lb RATHER MORE / -O" futube ^7 VADRK AT HONIE.. -TV THESE LECTURES CERTAINUV THEY BM TMR GIVE vou COCRESPONDENCH LOT (*- COURSE to TRAJNIMG JOST ASGOOO

~~7-« 1 1 v \ ?:~~

6 MONTHS LATER TRAINED BV VES, VOO TOO A.R.T.C. •? WELL IS NT IT WONDERFUL CAN GET OUT OP VOU'RE THE MAN TO BE ABLE VOUR DEAD-END LOO US / h JOB, AND EARN TO BUY THIS CAR/ res. MORE MONEY, IF — THANKS TO VOU MAKE VOUR V AAYA-RXC. V, si TRAINING . SPARE TIME PAY o/ WITH AM A.HT.C m COURSE.

~~ft. 6~~

~~GET INTO ONE OF THESE PROFITABLE CAREERS IN RADIO AND TELEVISION~~

There is a profitable career for you in the many phases of radio television including manufacturing, radio servicing, television servicing, research, sales broadcasting and television executive, armed forces. A.R.T.C. can help you gain one of these much sought-after positions. But remember, it is only the trained man who succeeds and A.R.T.C. can give you the complete training which is necessary.

TRAIN AT HOME OR AT MAKE SPARE-TIME MAIL COUPON NOW THE COLLEGE MONEY You are invited to mail the coupon below which can be your first step to- With A.R.T.C. vou can obtain the If you wish you can make your spare wards securing a iob or business of training you need. At the benches and fime eorn money for you. Many your own with good prospects, security in the lecture halls of Australian students make extra money at spare and big money. A.R.T.C. will mail to you Radio and TV college or in your own time work after only the first few by return, at no obligation to you home by correspondence . . . you can weeks. Think of all those things extra the big free booklet: "Careers in Radio be taught every important aspect of and Television." This booklet will show radio, television, details of every appli- money con bring you, home of your you definite steps you can take for a cation' of the fundamental principles. own, ear, time for relaxation, etc. better job, how you can succeed in The course is intensely practical and Safegurd your future .... mail the life. Post the coupon, phone or call individual. coupon today. NOW.

AUSTRALIAN RADIO & TELEVISION AUSTRALIAN RADIO COLLEGE PTY. LTD., 206 Broedway, Sydney, N.S.W. AND TELEVISION Dear Sir, Please send me, uilhout oblinalion, your free booklet "Careers in Radio and Television." COLLEGE PTY. LTD NAME nirerrs i"__ E. S. & A. BANK BUILDING, ADDRESS — Cnr. Broadway and Cify Road, Sydney. iiT, (Opp. Grace Bros.) Phone 211-4244 (3 lines.) 1 v '.v/ O.v