Seems like I've been away from the bench forever with other stuff going on. All my parts are in for this 222 and I'll be starting in on it shortly. I took another and more thorough pass at the controls last night. In particular, I really hosed out the switches with CRC and D5, and what do you know? Perfectly clean strong audio passing through both channels now. Quiet, no hums or buzzes.
JJ Grey & Mofro soundcheck on the AU-222
JJ Grey & Mofro soundcheck on the AU-222