Quote Originally Posted by skimask View Post
I think I found the ROOT cause of the problem.....
Can't check it out completely yet, still don't have a high-gain replacement for Q22 on hand.
Update to the update...
Finally got my hands on actual TIP107's.
Swapped 'em out, ran the microchine for about 15 minutes, works like a champ...
The original problem (besides the bad LM324) might have also had a little something to do with the fact that Q22 originally didn't have any heatsink compound under the TO-220 case at all...don't know...don't care...it's all working...