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I have a Philco 46-1213 radio that came with a factory wiring error. The FM had a really muffled sound to it, I ended up finding a bypass capacitor was connected to the plate of the FM1000 detector tube instead of the B+ end of the plate resistor. It was acting as a low pass filter in this case. Fixing that wiring error got the radio working as it was supposed to from the beginning.
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Erich Loepke
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