[Pa28rt201T]

I am working on a 37-84, code 121. It uses an 80, a 42 and 2 - 77's. It's the same schematic as the 122, except that the tubes (which are essentially the same spec) are 4 and 6 pin tubes in the 121 and 8 pins in the 122. I tried to post the 121 schematic but can't seem to make it work. You're right, I see the center tap is not included in the 122 schematic. No shorts and good continuity on the tubes. I guess the only way for me is to fire it up and see if it works.

Thank you for your advise.