B200s hum

[duecemfhatchet]

I have a B200s power amp that has a extremely loud buzz or hum. It has steadily gotten louder to the point of almost being unusable. Any ideas where to start?

[MarshallJMP]

I would start with the big caps in the power supply. It could also be that one of the transistor is drawing to much current. Do you have DC voltage on the output?
Do you have hum on both channels?

[duecemfhatchet]

Yes it is in both channels and no DC voltage at outputs.

[MarshallJMP]

In that case I would suspect a faulty filter cap.