Improving the Coupling Capacitors for Better Tone Sounding

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I never did like the sound of mica caps, now I know why

I always liked the look of the RMC ceramic caps with the green paint. Made them sound better.

I like the Fender 10 pf caps with the diamond logo but don't know who made them.

Polycarbonate caps have good tempco specs. Found this out in a 60 cycle oscillator for a power meter tester. The circuit was right in front of a cooling fan. The fan would make the frequency drift from 59 to 62 cps , polycarb fixed the problem.

FM discriminator coils use those weird dog bone caps for low L.
 
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