Silicon ChipRestoring Vintage Radio Receivers - May 1988 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Lo, the dreaded microprocessor
  4. Restoring Vintage Radio Receivers by John Hill
  5. Subscriptions
  6. Feature: The Way I See It by Neville Williams
  7. Project: Optical Tachometer for Aeromodellers by John Clarke & Greg Swain
  8. Project: Fit High-Energy Ignition to Your Car by Leo Simpson & John Clarke
  9. Feature: Motorola's MC3334P High Energy Ignition IC by Leo Simpson
  10. Project: Walkaround Throttle for Model Railroads, Pt.2 by Leo Simpson & John Clarke
  11. Serviceman's Log: Double or quits - toss ya! by The Original TV Serviceman
  12. Project: Ultrasonic Car Burglar Alarm by Branco Justic
  13. Feature: Amateur Radio by Garry Cratt, VK2YBX
  14. Project: Build the Party Light by Stephen David
  15. Feature: The Evolution of Electric Railways by Bryan Maher
  16. Feature: Digital Fundamentals, Pt.7 by Louis E. Frenzel
  17. Market Centre
  18. Advertising Index
  19. Outer Back Cover

This is only a preview of the May 1988 issue of Silicon Chip.

You can view 39 of the 96 pages in the full issue, including the advertisments.

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Articles in this series:
  • The Way I See It (November 1987)
  • The Way I See It (November 1987)
  • The Way I See It (December 1987)
  • The Way I See It (December 1987)
  • The Way I See It (January 1988)
  • The Way I See It (January 1988)
  • The Way I See It (February 1988)
  • The Way I See It (February 1988)
  • The Way I See It (March 1988)
  • The Way I See It (March 1988)
  • The Way I See It (April 1988)
  • The Way I See It (April 1988)
  • The Way I See It (May 1988)
  • The Way I See It (May 1988)
  • The Way I See It (June 1988)
  • The Way I See It (June 1988)
  • The Way I See it (July 1988)
  • The Way I See it (July 1988)
  • The Way I See It (August 1988)
  • The Way I See It (August 1988)
  • The Way I See It (September 1988)
  • The Way I See It (September 1988)
  • The Way I See It (October 1988)
  • The Way I See It (October 1988)
  • The Way I See It (November 1988)
  • The Way I See It (November 1988)
  • The Way I See It (December 1988)
  • The Way I See It (December 1988)
  • The Way I See It (January 1989)
  • The Way I See It (January 1989)
  • The Way I See It (February 1989)
  • The Way I See It (February 1989)
  • The Way I See It (March 1989)
  • The Way I See It (March 1989)
  • The Way I See It (April 1989)
  • The Way I See It (April 1989)
  • The Way I See It (May 1989)
  • The Way I See It (May 1989)
  • The Way I See It (June 1989)
  • The Way I See It (June 1989)
  • The Way I See It (July 1989)
  • The Way I See It (July 1989)
  • The Way I See It (August 1989)
  • The Way I See It (August 1989)
  • The Way I See It (September 1989)
  • The Way I See It (September 1989)
  • The Way I See It (October 1989)
  • The Way I See It (October 1989)
  • The Way I See It (November 1989)
  • The Way I See It (November 1989)
  • The Way I See It (December 1989)
  • The Way I See It (December 1989)
Articles in this series:
  • Walkaround Throttle for Model Railroads (April 1988)
  • Walkaround Throttle for Model Railroads (April 1988)
  • Walkaround Throttle for Model Railroads, Pt.2 (May 1988)
  • Walkaround Throttle for Model Railroads, Pt.2 (May 1988)
Articles in this series:
  • Amateur Radio (November 1987)
  • Amateur Radio (November 1987)
  • Amateur Radio (December 1987)
  • Amateur Radio (December 1987)
  • Amateur Radio (February 1988)
  • Amateur Radio (February 1988)
  • Amateur Radio (March 1988)
  • Amateur Radio (March 1988)
  • Amateur Radio (April 1988)
  • Amateur Radio (April 1988)
  • Amateur Radio (May 1988)
  • Amateur Radio (May 1988)
  • Amateur Radio (June 1988)
  • Amateur Radio (June 1988)
  • Amateur Radio (July 1988)
  • Amateur Radio (July 1988)
  • Amateur Radio (August 1988)
  • Amateur Radio (August 1988)
  • Amateur Radio (September 1988)
  • Amateur Radio (September 1988)
  • Amateur Radio (October 1988)
  • Amateur Radio (October 1988)
  • Amateur Radio (November 1988)
  • Amateur Radio (November 1988)
  • Amateur Radio (December 1988)
  • Amateur Radio (December 1988)
  • Amateur Radio (January 1989)
  • Amateur Radio (January 1989)
  • Amateur Radio (April 1989)
  • Amateur Radio (April 1989)
  • Amateur Radio (May 1989)
  • Amateur Radio (May 1989)
  • Amateur Radio (June 1989)
  • Amateur Radio (June 1989)
  • Amateur Radio (July 1989)
  • Amateur Radio (July 1989)
  • Amateur Radio (August 1989)
  • Amateur Radio (August 1989)
  • Amateur Radio (September 1989)
  • Amateur Radio (September 1989)
  • Amateur Radio (October 1989)
  • Amateur Radio (October 1989)
  • Amateur Radio (November 1989)
  • Amateur Radio (November 1989)
  • Amateur Radio (December 1989)
  • Amateur Radio (December 1989)
  • Amateur Radio (February 1990)
  • Amateur Radio (February 1990)
  • Amateur Radio (March 1990)
  • Amateur Radio (March 1990)
  • Amateur Radio (April 1990)
  • Amateur Radio (April 1990)
  • Amateur Radio (May 1990)
  • Amateur Radio (May 1990)
  • Amateur Radio (June 1990)
  • Amateur Radio (June 1990)
  • Amateur Radio (July 1990)
  • Amateur Radio (July 1990)
  • The "Tube" vs. The Microchip (August 1990)
  • The "Tube" vs. The Microchip (August 1990)
  • Amateur Radio (September 1990)
  • Amateur Radio (September 1990)
  • Amateur Radio (October 1990)
  • Amateur Radio (October 1990)
  • Amateur Radio (November 1990)
  • Amateur Radio (November 1990)
  • Amateur Radio (December 1990)
  • Amateur Radio (December 1990)
  • Amateur Radio (January 1991)
  • Amateur Radio (January 1991)
  • Amateur Radio (February 1991)
  • Amateur Radio (February 1991)
  • Amateur Radio (March 1991)
  • Amateur Radio (March 1991)
  • Amateur Radio (April 1991)
  • Amateur Radio (April 1991)
  • Amateur Radio (May 1991)
  • Amateur Radio (May 1991)
  • Amateur Radio (June 1991)
  • Amateur Radio (June 1991)
  • Amateur Radio (July 1991)
  • Amateur Radio (July 1991)
  • Amateur Radio (August 1991)
  • Amateur Radio (August 1991)
  • Amateur Radio (September 1991)
  • Amateur Radio (September 1991)
  • Amateur Radio (October 1991)
  • Amateur Radio (October 1991)
  • Amateur Radio (November 1991)
  • Amateur Radio (November 1991)
  • Amateur Radio (January 1992)
  • Amateur Radio (January 1992)
  • Amateur Radio (February 1992)
  • Amateur Radio (February 1992)
  • Amateur Radio (March 1992)
  • Amateur Radio (March 1992)
  • Amateur Radio (July 1992)
  • Amateur Radio (July 1992)
  • Amateur Radio (August 1992)
  • Amateur Radio (August 1992)
  • Amateur Radio (September 1992)
  • Amateur Radio (September 1992)
  • Amateur Radio (October 1992)
  • Amateur Radio (October 1992)
  • Amateur Radio (November 1992)
  • Amateur Radio (November 1992)
  • Amateur Radio (January 1993)
  • Amateur Radio (January 1993)
  • Amateur Radio (March 1993)
  • Amateur Radio (March 1993)
  • Amateur Radio (May 1993)
  • Amateur Radio (May 1993)
  • Amateur Radio (June 1993)
  • Amateur Radio (June 1993)
  • Amateur Radio (July 1993)
  • Amateur Radio (July 1993)
  • Amateur Radio (August 1993)
  • Amateur Radio (August 1993)
  • Amateur Radio (September 1993)
  • Amateur Radio (September 1993)
  • Amateur Radio (October 1993)
  • Amateur Radio (October 1993)
  • Amateur Radio (December 1993)
  • Amateur Radio (December 1993)
  • Amateur Radio (February 1994)
  • Amateur Radio (February 1994)
  • Amateur Radio (March 1994)
  • Amateur Radio (March 1994)
  • Amateur Radio (May 1994)
  • Amateur Radio (May 1994)
  • Amateur Radio (June 1994)
  • Amateur Radio (June 1994)
  • Amateur Radio (September 1994)
  • Amateur Radio (September 1994)
  • Amateur Radio (December 1994)
  • Amateur Radio (December 1994)
  • Amateur Radio (January 1995)
  • Amateur Radio (January 1995)
  • CB Radio Can Now Transmit Data (March 2001)
  • CB Radio Can Now Transmit Data (March 2001)
  • What's On Offer In "Walkie Talkies" (March 2001)
  • What's On Offer In "Walkie Talkies" (March 2001)
  • Stressless Wireless (October 2004)
  • Stressless Wireless (October 2004)
  • WiNRADiO: Marrying A Radio Receiver To A PC (January 2007)
  • WiNRADiO: Marrying A Radio Receiver To A PC (January 2007)
  • “Degen” Synthesised HF Communications Receiver (January 2007)
  • “Degen” Synthesised HF Communications Receiver (January 2007)
  • PICAXE-08M 433MHz Data Transceiver (October 2008)
  • PICAXE-08M 433MHz Data Transceiver (October 2008)
  • Half-Duplex With HopeRF’s HM-TR UHF Transceivers (April 2009)
  • Half-Duplex With HopeRF’s HM-TR UHF Transceivers (April 2009)
  • Dorji 433MHz Wireless Data Modules (January 2012)
  • Dorji 433MHz Wireless Data Modules (January 2012)
Articles in this series:
  • The Evolution of Electric Railways (November 1987)
  • The Evolution of Electric Railways (November 1987)
  • The Evolution of Electric Railways (December 1987)
  • The Evolution of Electric Railways (December 1987)
  • The Evolution of Electric Railways (January 1988)
  • The Evolution of Electric Railways (January 1988)
  • The Evolution of Electric Railways (February 1988)
  • The Evolution of Electric Railways (February 1988)
  • The Evolution of Electric Railways (March 1988)
  • The Evolution of Electric Railways (March 1988)
  • The Evolution of Electric Railways (April 1988)
  • The Evolution of Electric Railways (April 1988)
  • The Evolution of Electric Railways (May 1988)
  • The Evolution of Electric Railways (May 1988)
  • The Evolution of Electric Railways (June 1988)
  • The Evolution of Electric Railways (June 1988)
  • The Evolution of Electric Railways (July 1988)
  • The Evolution of Electric Railways (July 1988)
  • The Evolution of Electric Railways (August 1988)
  • The Evolution of Electric Railways (August 1988)
  • The Evolution of Electric Railways (September 1988)
  • The Evolution of Electric Railways (September 1988)
  • The Evolution of Electric Railways (October 1988)
  • The Evolution of Electric Railways (October 1988)
  • The Evolution of Electric Railways (November 1988)
  • The Evolution of Electric Railways (November 1988)
  • The Evolution of Electric Railways (December 1988)
  • The Evolution of Electric Railways (December 1988)
  • The Evolution of Electric Railways (January 1989)
  • The Evolution of Electric Railways (January 1989)
  • The Evolution Of Electric Railways (February 1989)
  • The Evolution Of Electric Railways (February 1989)
  • The Evolution of Electric Railways (March 1989)
  • The Evolution of Electric Railways (March 1989)
  • The Evolution of Electric Railways (April 1989)
  • The Evolution of Electric Railways (April 1989)
  • The Evolution of Electric Railways (May 1989)
  • The Evolution of Electric Railways (May 1989)
  • The Evolution of Electric Railways (June 1989)
  • The Evolution of Electric Railways (June 1989)
  • The Evolution of Electric Railways (July 1989)
  • The Evolution of Electric Railways (July 1989)
  • The Evolution of Electric Railways (August 1989)
  • The Evolution of Electric Railways (August 1989)
  • The Evolution of Electric Railways (September 1989)
  • The Evolution of Electric Railways (September 1989)
  • The Evolution of Electric Railways (October 1989)
  • The Evolution of Electric Railways (October 1989)
  • The Evolution of Electric Railways (November 1989)
  • The Evolution of Electric Railways (November 1989)
  • The Evolution Of Electric Railways (December 1989)
  • The Evolution Of Electric Railways (December 1989)
  • The Evolution of Electric Railways (January 1990)
  • The Evolution of Electric Railways (January 1990)
  • The Evolution of Electric Railways (February 1990)
  • The Evolution of Electric Railways (February 1990)
  • The Evolution of Electric Railways (March 1990)
  • The Evolution of Electric Railways (March 1990)
Articles in this series:
  • Digital Fundamentals, Pt.1 (November 1987)
  • Digital Fundamentals, Pt.1 (November 1987)
  • Digital Fundamentals, Pt.2 (December 1987)
  • Digital Fundamentals, Pt.2 (December 1987)
  • Digital Fundamnetals, Pt.3 (January 1988)
  • Digital Fundamnetals, Pt.3 (January 1988)
  • Digital Fundamentals, Pt.4 (February 1988)
  • Digital Fundamentals, Pt.4 (February 1988)
  • Digital Fundamentals Pt.5 (March 1988)
  • Digital Fundamentals Pt.5 (March 1988)
  • Digital Fundamentals, Pt.6 (April 1988)
  • Digital Fundamentals, Pt.6 (April 1988)
  • Digital Fundamentals, Pt.7 (May 1988)
  • Digital Fundamentals, Pt.7 (May 1988)
  • Digital Fundamentals, Pt.8 (June 1988)
  • Digital Fundamentals, Pt.8 (June 1988)
  • Digital Fundamentals, Pt.9 (August 1988)
  • Digital Fundamentals, Pt.9 (August 1988)
  • Digital Fundamentals, Pt.10 (September 1988)
  • Digital Fundamentals, Pt.10 (September 1988)
VINTAGE RADIO By JOHN HILL It's time to start collecting If you 're going to start collecting vintage radios, there is no better time to start than now. Unrestored treasures lie waiting in houses, antique shops and garages, and can generally be picked up for a few dollars. Collecting is a well recognised hobby which has many adherents. Collecting not only gives the collector a purposeful interest but also consumes his spare time in a most pleasant manner. Unfortunately, some forms of collecting can cost heaps of money, megabucks in fact. If your interest happens to be veteran cars, antique clocks or rare postage stamps, then you will need a very thick wallet if you are going to build up a worthwhile display. / As I write this I am surrounded by my collection of radios and looking around, I see that I paid $40 for one (got ripped off there), a number of others which cost $20 or less and ten that were given to me. There are also a few horn speakers that average out at about $59 each. I mention this to give readers some indication of how relatively inexpensive collecting old radios can be. Admittedly it does cost money but in my case, I can comfortably finance my hobby with my pocket money and have done so since I started collecting about three years ago. Some people spend more on cigarettes than I spend on radios. Collecting old radios If you are thinking about collec- Sets that can't be restored should. be stripped for spares. If you're a serious collector, those parts are going to come in handy. 6 SILICON CHIP ting old radios there are a couple of things you will soon find out. First, if you look in the right places there are heaps of old valve radios around just waiting to find a new owner. Second, you need not outlay large sums of money because $25 will buy a good many of them. Now if you are serious about getting a vintage radio collection together and have done nothing about it, then you had better get going. Even during the short time that I have been collecting, I have noticed that the more collectable items are becoming scarcer. Actually there are quite a number of valve radios that are still in everyday use. The oldest set that I know of that is still going strong for its 78-year old owner is a 1939 "Airzone", a very stylish console model. Although most operational sets are not that old, many have been going for years and may go many more before they finally stop working. When that fateful day comes it will be the point of no return, for suddenly the radio will become useless and almost worthless. The reason for this is that under most circumstances, the set cannot be repaired. Almost no radio/TV repair shop can service valve radios anymore. They have neither the desire or the necessary parts to repair them. In some cases, they may even lack the know-how. This is the type of radio that the vintage radio collector is likely to pick up. It will either be given to him or be bought very cheaply. It is this type of radio that is seen at flea markets, garage sales and in junk shop windows. They usually don't work and a very fine line separates them from the rubbish tip. This neat little Radiola was produced in both bakelite and plastic and is a fairly common radio from the early post-war years. Three of the these four plastic cabinet radios are in the process of cracking up. While they were reasonable radios in their day, they have little appeal to most serious collectors. These pre-loved radios will most likely be relatively late-model valve sets and may only be about 25 years old. (Valve radios were still being sold in 1966). To a collector, such a radio is rarely considered a good collectable item, mainly because the last generation of valve radios lack the enduring qualities of the earlier sets. They just haven't got the same appeal. Different categories In order to explain further, now would perhaps be a good time to. place these old radios into categories. One way of classifying them is to place them into groups according to their age. I see these groups as follows. Any radios that are pre-1930, and have separate speakers and reaction circuits, would have to be genuine antiques. As stated elsewhere, these are very collectable items. The next category is pre-war (1930 to 1940). This is also an interesting era for radio because receivers improved so much during that decade. They came from being relatively primitive to quite sophisticated. Next was the post-war period to about 1955, a period where valve radios were perhaps at their best - good receivers with excellent speakers. Many of the radios in this age group are what I consider to be very collectable; old enough to be interesting, yet modern enough to sound really good. Finally, there was the plastic era when plastic began to replace Bakelite and timber. While these radios are interesting in some respects, they are not satisfying from a collector's point of view. Unfortunately the plastics used in these radios are inclined to selfdestruct after 20 years or so and they simply weren't built to last as were their predecessors. Valve radios can also be classified into various types of receivers such as 240-volt operated; battery operated; battery vibrator; battery portables; mantle radios;, table models; consoles; radiograms and even car radios. Collectors have plenty to choose from but most seem to concentrate on one or two particular categories. In my case, I collect radios from the 1020s to the 1950s. I do not collect radiograms for the simple reason that they occupy so much space; I cannot accommodate them. I also have a few battery sets and operate them on a combination of rechargeable batteries and a "B" eliminator. Generally speaking , batteryoperated valve radios are only mediocre in their performance and usually fail to compare favourably with their 240-volt brethren. Some of the early "permag" speakers were only fair and this could be one of several reasons why battery sets are a bit lacking in sound quality. The 1920s era In my opinion, the really collectable radios are those from the 1920s era. These are the most expensive to buy and the most difficult to locate. They sound terrible but from a display point of view they are quite unique and therefore very desirable. I have only one genuine late 1920s receiver and it in extremely good condition. As this set only cost $20, I consider my.s elf most fortunate to have bought it at such a MAY1988 7 A 1941 model Radiola; timber cabinets have much more appeal than plastic or Bakelite. reasonable price. I would like to own others and am prepared to pay whatever they are worth. However, most people who have these ancient receivers want to keep them. Where to look Anyone making a start at collecting should consider everything as collectable. They should not miss a single opportunity to pick up any valve radio. Collecting need not be restricted to valve radios for some collectors wish to include transistor radios in their collections. Sometimes junk is the only word to describe some of the "treasures" one collects and it is incredible that these neglected old sets have not been dumped long ago. However, any wrecked radio, no matter how derelict, usually has a few usable parts that are worth salvaging. The logical places to look for old radios are in junk shops, opportunity shops, used furniture stores, auction rooms, school fetes, white elephant sales, garage sales and antique shops. Regarding the latter: the better class of antique dealer doesn't sell old radios. It's the antique-cum-junk shop that is more likely to carry a vintage radio treasure. Bakelite radio cabinets are more durable than plastic. This Kreisler of about 1948 vintage has survived 40 years quite well. 8 SILICON CHIP While old radios can often be picked up at reasonable prices at any of the above-mentioned places, some secondhand dealers put ridiculous prices on their wares. These seemingly high prices are usually negotiable as the following story indicates. I was in an antique shop looking at a large table model radio that was in very good external condition. It was a 6-valve Philips, with dual wave coverage, a timber cabinet and a tip up dial. The price tag was $32. After finding out that the set didn't work, I commented that it seemed like a lot to pay for a bung radio. I was immediately offered the set for $10 which was a far more reasonable amount. Actually, I would have paid up to $20 but I didn't argue over the price. If the truth was known, that set had probably sat there for a considerable time without a single enquiry and it must have seemed like the ideal time to sell when I showed an interest in it. On the other hand, a radio in good going order must command a better price. What's more, if it's going, there is a lot less risk involved. It could well suit come collectors to buy this type of radio. It may cost more but at least it's a goer and you know what you're getting. One must always keep in mind that buying from shops is probably the dearest way of obtaining old radios. Shopkeepers have overheads and that puts up the price of the items they sell. However, there Old radio service equipment is also worth collecting. Shown is a "University" radio frequency generator._ Typical unrestored treasure; incomplete, doesn't go, but soon will. are other ways of getting into vintage radio sets. Old radios can be found in peoples' homes, sheds and garages; . in farmers' barns and cow sheds: as well as a few other less likely places such as factories and offices. In many instances their owners are quite happy to give them to anyone who can put them to good use. The fact that the radio will be restored and placed in a collection is very pleasing to many owners, particularly those who have some sentimental attachment to the set. Therefore, the first priority when collecting is to tell others of your interest, being careful not to bore them with too many details. I have made a point of telling just about everyone I know or come into contact with that 1 collect old radios and most of these people keep me in mind. often get a phone call about a radio that is collecting dust in somebody's shed and, in many instances, it is only a matter of picking it up and it's mine. A couple of months ago I had a phone call from an old acquaintance who I have only seen once in r A Radiola console model from 1940; these larger radios usually have a very mellow tone. the last 20 years. During that meeting I found out that he had become interested in amateur radio and he learned that I was dabbling around in vintage radio. The phone call was to tell me that he had found a heap of old radios if I was interested in collecting them. To cut a long story and a 300-kilometre trip short, I ended up with a whole car full of radios, including an oscilloscope and a radio frequency generator for a mere $180. So there is just one example of how it pays to advertise amongst those whom you know. Most radio collectors, unless they are particularly rich, will have to be content with collecting whatever they can find. It is all very nice to want a roomful of 1920s style radios in perfect condition, but they simply aren't available to collect. These sets were comparatively rare in the 1920s and very few have survived the ravages of time. I find it more realistic to collect more recently made receivers and I'm particularly fond of those pleasant sounding console and large table models. The majority of these radios have timber cabinets which makes such sets a triple bonus. They have good sound, good looks and are a pleasure to own. Summing up, if you haven't started collecting and wish to do so, then now is the time start - before it's too late. Spare parts My approach to collecting valve radios is to buy just about anything I can lay my hands on. I restore what is restorable and wreck for spare parts what is not. My score at the moment is two dozen restored sets with about the same number in the garage waiting their turn. I also have a good supply of bits and pieces including a quantity of valves. Collecting old radios, or anything else for that matter, is really good fun. There is nothing quite like the feeling of getting onto a nice "new" treasure. However, collecting radios is only half the fun. The other half is the repairing and restoring process. Next month we get stuck into the finer points of restoring these-ancient and often defunct radio receivers. ~ MAY 1988 11