Time for a trade for something new. I have not had any problems with my C 2300 but I would not put up with what your going through. I had a MC207 that had a bad hum in the transformer right out of the box. The dealer did get me a new replacement after I drove 4 hours each way to pick up the first amp. then again for the exchange, luckily the second amp has been working perfectly and hum free.
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