Relief!
While I let this thread stagnate a bit, I was spending all my free time either waiting for parts or working through issues on this amp with guidance from Joe.
A quick slip of the meter probe across Q1 C and E leads promptly caused Q1, R37R, R37L, R81, D80 and VR1 to earn a very short meantime between failure rating. Not having a warehouse of parts available, I waited for Mr. Mouser to deliver reinforcements.
Once repaired, the WO PL14_20 board was reinstalled. Since my last post, I found a sneaky RCA input to normal/direct switch ground reference. I added all the capacitors listed in the WO single point grounding scheme. I also bought new MJ21196 output transistors and new RCA 410s for drivers.
She fired up with out the alarm clock buzzing noise coming through the speakers. I have a DC offset of -0.08 VDC and bias holds nice and steady at .380 VDC.
I hooked her up and let it rip. What an amp! It is smooth and responsive. Quick but not harsh. Detailed but natural sounding. Clean and quiet. As a matter of fact, it revealed a low amount of hum coming from my turntable. I'll have to get after that...
Now I'm watching the backplane thread. More gears are turning...