Okay. did a test of the AC string. Everything checks out except the following pins measured no continuity to ground. Per Sam's T-54:
V4 6AU6 Pin 4
V5 6AU6 Pins 3 & 4
V6 6AU6 Pins 3 & 4
I'm hoping this is an ah-ha! moment. All the wiring in this area looks fine. I'm thinking (hoping?) one of you guys can take a look at a schematic armed with this info and say "check ceramic cap on V4" or words to that effect.
I say this because I don't want to go into this area half-cocked and mess something up. Especially after this real pretty recap.
Thanks.