When nothing is plugged into the amp and I have the clean channel on high volume, there isn't much of a problem. But when I have the distortion channel on, especially with the More Gain switched on, there is such a terrible humming/buzzing/white noise that basically ruins any chance of getting a nice, clear recording with it. I'm thinking, since it is about 7 years old, the capacitors could be worn down? Thanks
It doesn't happen often but I suspect that the high gain input jack is defective. With nothing plugged into either input jack part of the signal is grounded and there should not be any noise. It might be that plus a noisy preamp tube. Try swapping the first two tubes to see if there is less noise. Carefully bang your fist or use an insulated tool's handle to hear if the noise changes. It might be an intermittent solder connection as well.
SOURCE: Deville 212 overdrive channel making Loud humming noise
It sounds like a filter capacitor(s) has failed. The electrolytic caps dry out and cease to perform allowing unfiltered power to reach the preamp sections and get amplified.
Being this is tube with high voltages, an experienced person should work on it due to shock danger.
I assume you checked the tubes for shorts as well as emission since a heater to cathode short could cause this as well.
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