This could be a number of things , disconnect inputs and try running , if problem still there , I would suspect either an arcing power switch , loose pcb mount grounding screw , or there actually is a problem such as a capacitor , poor solder joint , or semiconductor breakdown , in which case if you are technically inclined , get the service manual . Get it anyways if you plan on keeping the amp. as most go out of print within a couple of years and photocopies are terrible for schematic reading down the road . Also , eliminate ac line "hash" that can be caused by light dimmers , fridge , air cond. cycles , elecric motors , etc. GOOD LUCK!
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