Peavey Bass 400 Normal Problem

[hotrodder_83]

I have an older 400 model. I think it's a B version. It seems that the Normal side is about 1/100th the volume that the Distortion side is. I cannot see any burnt or destroyed parts inside. I remember many years ago I had my paino plugged into it from the headphone jack. Could this have caused the problem? Anyone know what might be the culprit?

[AlexanderB]

The resistors, capacitors, pots and circuit board in the input stage can sure be broken and still look OK at a quick glance. Some components can be completely broken and still look new.

I have worked on that (IMHO) awful amp a couple of times and although it has fiber glass circuit boards (if my memory serves me), these things are old now. Measure all components with a multimeter and use a magnifying glass to check the PCB.

Or (perhaps quicker), replace all components in that input section.

/Alexander

[hotrodder_83]

is the same thought I had when I came up with no other solution, but next to parts guessing I was hoping to find out what went bad. I am sure that there is alot of leakage, but l have to be practical about this and realize that in perfect working cond. it would be hard to get $100 for it.