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  1. S

    Mark III problem

    A new, but possibly important discovery which will expose my ignorance but may also help in diagnosis. The amp only makes this buzzing sound when in Class A mode. I switched to Simul Class mode and I thought I heard a similar sound, switched it back to Class A and it was REALLY there. So...
  2. S

    Mark III problem

    Though I will try replacing the preamp tubes one by one, I have noticed other problems. In the back of the amp, there is an effects loop in/out and a presence knob. There are no effects running into the unit, yet the presence knob effects the sound anyway. When the presence knob is turned to...
  3. S

    Mark III problem

    I currently have a Mark III and love it around Vol. 2... however, when I turned it past 2 on the Master, whenever I would play a muted note on overdrive, I would hear crackling and have, in the past, heard squeeling. It sounds great until I go loud with it. Is this a problem with the power...
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