Enormously helpful. I flipped the gain switch the opposite way as well as the mute. There's some sound but I'm not there yet. At least I know the cabling is correct.
The sound is faint and thin. I tried the 45/300b switches and no change. I don't have my multimeter at this house so I'm flying a little blind. Is there a chance I installed the output tubes incorrectly? I can shut it down and reseat them.