I had this amp all back together and figured I was about done. Just do the bias adjustments and such and I'd be good to go....
It was the "and Such" part that things start to go bad... I adjusted the bias (7mv) on both channels without problems. Sounded fine... I hooked up the 8 ohm laod resistors and ran a 1k Hz signal through it to measure the gain. One channel was producing a whopping 25v (39 watts RMS). The other was clipping at 18v (19 watts RMS). Hummm..... I did some voltage checks and found that I was down 10v (24v should have been 35v) on the collector side of the output trasistors....
I figured this was a transistor issue, So now I had to take the unit partially down again to get access to the board. While it was down, I re-check the resistors and diodes. Did this once... but ya just got to be sure... I could have missed somthing. I found all to be well, so I was sure this was transistor related issue. I spent some time with the schematics and narrowed this down to three of eight transistors in this channel. I had a pair of exact replacemets for the current limiters (suspects) so I swapped them out ....
