Well I adjusted the "bias" to get 7 mv across R72, before the adjustment it was like 9mv. Incidentally all the other .47ohm resistors in series with the power transformers have 7mv across them now as well. I played for like 2 hours at full volume and nothing bad happened. Could I have fixed it with this adjustment? I find it hard to believe. I bet next band practice it will start its crapping out thing again. *sigh* Ill keep you guys posted. Any suggestions will be appreciated.