Dynaco QSA-300

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I am working on a Dynaco Quad amp. Channels B & D work fine. Channels A & C are distorted with low output. There are no signs of bad capacitors on either board. All fuses check good. Should I look into replacing or rebuilding the two boards? Is there some internal adjustment I need to make? I know this is essentially two identical 150s wired together on one chassis. What doesn't make sense is that one channel on each side works fine, and the other is distorted. I have switched speakers on each channel to rule out a bad speaker. Any ideas about what to look at next? Thanks for your help.

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Topic - Dynaco QSA-300 - dpsutphin 13:06:54 07/06/16 (9)

If Mine... I'd move on. - bare 19:17:14 07/08/16 (1)

RE: If Mine... I'd move on. - mark.korda@myfairpoint.net 19:42:16 07/18/16 (0)

RE: Dynaco QSA-300 - Awe-d-o-file 15:21:56 07/06/16 (4)

RE: Dynaco QSA-300 - dpsutphin 10:17:27 07/07/16 (1)

RE: Dynaco QSA-300 - Awe-d-o-file 10:32:50 07/07/16 (0)

RE: Dynaco QSA-300 - dpsutphin 18:18:45 07/06/16 (1)

RE: Dynaco QSA-300 - Awe-d-o-file 04:33:44 07/07/16 (0)

Are you sure that - E-Stat 15:06:23 07/06/16 (1)

RE: Are you sure that - dpsutphin 18:16:06 07/06/16 (0)

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