I only had one audiobahn that did that, but if it is the power supply it should stay the same. I guess if you load that amp and it is regulated it could change as the PS ramps up. The AB I had to have the cover off and my ear right next to the transformer to hear a static type sound. it seemed to work fine though, I could find nothing wrong with it and with the fan going and cover on I could not tell. I'm not sure what else besides a transformer would buzz in an amp, guess I would take a look and try to locate it or use a piece of wood/plastic rod by ear.
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