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#1
02-11-2013, 12:46 AM
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Circa '62 Arvin 8-transistor radio
Today, I picked up this circa '62 Arvin model 61R58 8-transistor AM portable radio at the flea market. Over the years, I've had a few of these; but, they were all very beat up and/or missing parts. I've actually been looking at this radio for 2-3 months; but, didn't want to hand over the $20. I figured after a few months, I could get it cheaper; but, nope, he's one of those vendors who left instructions that the prices are marked, non-negotiable, and don't waste my time or yours calling me to ask if I'll come down. The radio actually has batteries in it and works; so, I broke down and bought it. I figure the owner used ebay as a price guide because most of these that I saw on that site go for $12-$15 and by the time shipping is added, that brings the price up to the $20-$25 range.
Anyway, this radio actually uses eight transistors in real circuit stages, unlike some models that used transistors as diodes and/or "dud" transistors that were not connected. This set uses a decent sized ferrite rod antenna, an RF stage, and two stages of IF amplification; so, it should be a good radio. Evern though it works, I can tell that the alignment is a little off and it could probably use some new capacitors.   
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http://www.youtube.com/user/radiotvphononut 
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#2
02-11-2013, 05:45 PM
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Interesting circuitry, transformerless output stage and large size batteries, for operating economy.
They must have built that model for a few years. The volume control code date is 1964, 33rd week.
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#6
02-16-2013, 04:19 AM
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Felix,
Take a look at the battery in the schematic. Notice that it is "center tapped" to provide the proper polarity voltage to the output transistors (both are PNP). Not totally unusual for radios of that vintage. It is a very nice radio and should be a great performer.
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Regards, Felix (vk4fuq) aka catman.
Linear Mode
