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Old 21st January 2010, 09:02 AM   #11
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The source resistors appear to be intact but if one is well out of tolerance, that could cause the amp to clip early.

Is the defective channel the only one that causes an increase in idle current when the bias pot is turned clockwise or counter-clockwise?

Adjusting the bias by monitoring the idle current worked on the 2200/2 I repaired.

The bias is important on this amp because (if I'm not mistaken), the bias pot controls the current through the differential amplifier and if there is insufficient current through the differential amp, the following stages can't be driven properly.

In addition to checking all of the driver transistors, check the SMD resistors for that channel on the driver board.
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Old 21st January 2010, 12:15 PM   #12
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By adjusting the bias pot I was able to get the channel to match the others. I will play music through it all day to see if my adjustments have any bad effects.
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