crackling pots in princeton reverb

[Bluefinger]

Hi,

I have a strange problem with my princeton reverb. All the pots are crackling as if they were dirty or worn out. They crackle in certain positions and anytime you adjust them. When I replece them with known good ones, they crackle as well. When I put the crackling pots into another amp, they work perfectly. The pot housings are solidly grounded with a ground bus ... still, could there be some kind of static? This does not make sense to me.

any ideas? thanks!

[Jazz P Bass]

Sounds to me like a capacitor is 'leaking' Vdc into the circuit.

[Bluefinger]

Thanks ... I haven't thought of that. I'll check that

[Jazz P Bass]

I am thinking 'coupling cap'.

[Bluefinger]

Thanks ... it turned out that the 250pf treble cap was leaking. The amp is working fine again!

[Jazz P Bass]

Glad you got it.
The clues where there.
You just had to find which one was leaking.