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    Distortion in one channel Mcintosh 225 amplifier

    I've had a Mcintosh 225 tube amplifier for about 5 years and the other day it developed distortion in one channel when the volume was turned up fairly loud. Here's what I've done: 1) Verified bias is at -21 volts for all 4 output tubes 2) Replaced all tubes with known good ones one-at-a-time 3)...
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