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Messages - Jdomi

Okay thanks for the advice, I will try to find and replace the pot, taking also a close look to the PCB solders.

I am looking for advices on troubleshooting a Marshall 3210lead Mosfet.
The problem is this: adjusting the bass in "normal" mode has almost no effect.
Everything else works fine. I found the diagram on the web but I don't see what element could cause this defect, in particular around the bass potentiometer. The potentiometer it self or maybe a capacitor?
Has anyone already  seen this problem or have a clue?

Thanks in advance.
(I am french and my English level is not so good, so thanks google translator!)