My peavey MAX 115 bass amp is giving me a very low hum and the volume doesnt go an 8th of the volume it used to when plugged into the input jack..
checked cords
tried my guitar with a different amp (worked fine)
Heres the wierd part.. I can plug into the return jack and it gets almost as loud as it used to. (gain and the eq knobs dont work though.)
The preamp section has a problem. It could be anything in the preamp but is OFTEN the input jack itself. They take a lot of abuse.
Also the insert jack contacts that forward the preamp to the power amp if no external FX are used can go bad.
Additional things are circuit board cracks caused by rough handling and also controls that have had the knobs mashed in which can destroy the potentiometers they are connected to.
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high gain input does not work
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