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| It's a Pilot 100 fm multiplexer. After passing a couple of minutes on it with my scope and generator, now I have a stereo output, but the sound is not good. Then, I tried to fix it by «ears», the mpx connect to a fm mpx tuner... Sound is better but not perfect. Tried different tubes, better result with NOS JAN tubes. Can I lubricate the coils to help me adjust them? If yes, with what? Is there a danger to often play with them (wear)? :
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