[ccomer1955]

Possibly, I could try to clean it. It is a replacement from Playthings of the Past, and I just put it on without opening it up. Come to think of it, it may not open. It is a Mallory replacement (the Mallory replacement book listed it as the one that goes in a 66).
It's an inefficient way to go about things, but I'm going to make a tube map (pin numbers and their connections on the schematic for each tube) and just go tube-by-tube checking the map. I'm still thinking I have the grounding wrong on the daughterboard. Those three or for caps/resistors on the daughterboard that are connected to each other at their grounded ends (on my 66, there was a single wire that ran to all of them and then to one end of C13). Where do they ground on yours?

Also, I have C50 (the two filter caps) grounded at C51, and I have C49 grounded on the chassis at the ground terminal attached to the 6A7 where the 20K resistor they added in the service notes is attached.

I think I need to rest it the rest of this evening and get a fresh start tomorrow. I'll make the map tonight, check it tomorrow and then go work on the chassis. Thanks for the help.