I have velleman tube amp and Audible Illusions tube preamp. There is a low level boom that comes from speakers randomally. Is this a proximaty issue (amp to close to preamp, wire or speakers etc) or is it inherent in this equipment?
If there is DC leakage, that can be a problem. I had same issue once with a pre. It was a bad resistor; shipping cost more than the repair. Try to isolate it to one component, then you will probably have to bring that unit to repair.
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