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60hz buzz

  1. Basspig

    McIntosh MC225 60Hz Buzz, Vol at Min, No Inputs

    Got a mystery problem here. MC225 amp, all new tubes, s/n A-weighted, left channel 80dB, right channel 72dB. Audible 60hz buzz with nothing connected to the inputs and volumes at minimum. Tried the filament circuit modification (ungrounding one side and putting 220Ω balanced resistors across...
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