![]() ![]() Modern common practice is to label the negative side of a capacitor with a black stripe. in pic 2 there is a closeup of them.īe careful replacing the caps on this radio! the electrolytics are the two black wrapped cylinders at the top right of pic 1. this is caused by a combination of dirty contacts on the volume control pot and failed caps causing a DC potential where there shouldn't be one. this particular set had a really bad scratchy volume control. lucky you!Įlectrolytics are what commonly fails on old transistor radios. look around the board and you will see it only has 2 electrolytic caps on it. ![]() the transistors are the oval topped, metal encased, chiclet sized devices on the board. You should have something similar to what's in the pic unless some joker pilfered or butchered the radio. The chassis will lift out but you'll have to de-solder the two speaker wires to liberate the circuit board (chassis) from the cabinet. the reason i have heard for these being common is they were given away as a promo when you bought a new sylvania TV set. they use older styled oval metal cased transistors so they are of interest to the vintage tech geek. This model of radio is common on ebay for $10 or less. the reflex circuit allowed a transistor to be used for two things at once, in this case it handled RF as well as audio at the same time. this radio is fine for listening to local AM stations but don't expect it to pull in signals from far away. the fact that it only uses 4 transistors gives it a slightly longer battery life than the more common 6 and 7 transistor AM radios of the time. this radio is unique in that it only uses 4 transistors. this size radio is what was called a coat pocket radio. This instructable is written around the sylvania 4P19W transistor radio. **this instructable takes into account that you're familiar with basic electronics, soldering, and basic hand tools.** ![]()
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