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Nice neat work Harold. Control board ships in the AM.

Do you have an oscilloscope?

With the variac all the way down and off, hook the speakers up and clip the DMM on the binding posts too. Then bring the variac up and see what the offset does as you turn up the variac, Should only take a few seconds to see what is happening.

Have you measured the output offset when your speakers are attached and the DBT brightens?

The picture you posted had them missing

Are you missing R39L/R?

Did you wire in the bias transistors correctly? With both channels acting up the same way, I would go there first.

Hi Richard Bias is running at what level??? "Bias is running at 4.9 MV, again, not far from spec."

Glad you are having some fun Harold...

Drafting mylar taped to the bottom of the meters.

We all need that Don...

Spot on Don, the calculations call for 23.6ma at 20KHz with 2.0VACrms into the network Makes you wonder why folks talk about burning up Zoebels?? And why they put that heavy duty Zoebel in the amps sold to Clair Brothers? A brain teaser indeed. At 350W full power output at 20KHz it is less...

15025s are PNPs and are not to be used in quasi-comp amps...

Are any of the transistors you removed shorted Collector to Emitter? Did you check them while they were out?

Well you found it then, You have a screw to chassis short going on under the right channel heatsink assembly. Time to take it off and find some broken sockets underneath it...

Possibly a shorted to chassis transistor case in column 1 or 3 where column 1 is near the transformer.

Rule #1 can take many forms and can be applied freely to the topic at hand :-)

Hi Mark You broke rule #1, no photos provided