CAR RADIOS RESTORED TO FACTORY SPECIFICATIONS


1957




...HONEYCOMB... THAT'LL BE THE DAY... MR. LEE... BLACK SLACKS...
...WAKE UP LITTLE SUZY...REET PETITE...THE STROLL...
...USSR puts sputnik in orbit, launches another with dog Laika...

Here's the radio from Cars & Parts Magazine's project car "Peggy Sue". A 1957 Chevrolet convertible. Looks pretty rough, huh? Well stick around and watch the transformation from nasty to nice.
This radio, model # 987575 is the first factory radio to employ a transistor rather than the usual vibrator-transformer-rectifier type power supply. Known as a "hybrid" it used new tubes that got their power directly from the 12 volt battery. It also featured a printed circuit, quite an innovation 47 years ago.  The first thing we'll do is disassemble the radio into it's various sub-assemblies. This series of radio was one of the first to use unitized construction. Some of the parts were mounted directly to the case. The transformers, filter capacitor etc. are removed and set aside. The main chassis is disassembled far enough for cleaning.
The outside case pieces and hardware is then glass beaded and cadmium plated. The printed board and tuning assembly is ultrasonically cleaned. The dial background and frame is cleaned and repainted. The faceplate and bezels are sent out for chrome. Now we get to the electronics. First, we'll replace all the paper and electrolytic capacitors. Clean the tube sockets and check the condition of the wiring. In these radios, the 10 ohm resistor for transistor bias is usually out of tolerance so it will be replaced. If everything checks so far, the sub-assemblies will be put together. The radio will be reassembled far enough to allow testing and alignment.  All mechanical parts have already cleaned and degreased, so lubrication is necessary. Here, I'm cleaning the tuner clutch. The tuner will then be checked and adjusted for zero backlash etc. It should operate smoothly with no binding and the pushbuttons should accurately set the tuner to the station they are set to. New plastic buttons are installed at this time
The radio will now be tested for power output,frequency response, distortion sensitivity, selectivity and drift. If it passes all these tests, it will be test run for 30-40 hours for long term stability. Once it gets through that perfectly, all the restored cosmetic parts are put back on along with new wiring for the dial lamp, "A" lead etc.
 
 


 
 
 
 

 


...LITTLE BITTY PRETTY ONE...AT THE HOP...GREAT BALLS OF FIRE...
...OH, BOY...SUGARTIME...26 MILES...FOUR WALLS...
...Oscars to Yul Brenner (The King and I)...Ingrid Bergman (Anastasia)... 

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