The schematic is directly copied from the factory schemo, and I started the thread very open ended to get very general comments first.
I had been wondering if there is a schematic error, and the base of Q1 is biased between R5 & R6. Then that 300uF becomes Q2 emitter bypass cap, and that 22R* becomes the feedback R. Luckily, PRR's post popped up as I was editing that into my previous post.
What IS happening with the output stage? I've been wondering myself, enough so to make it one of my main motivations for posting this schemo in the first place. Sofar in my limited time and budget I've only really messed with DC class A and have not done much PP & Comp Symm.
Circuitmaker still hates it though.
This amp looked suspiciously like the highly-touted Yamaha PM - 1000 mixer pre schemo... Circuitmaker works with that one.
*Individually selected per card.