Thanks for the reply. So if four 6L6s produce about 55 watts in Tweed mode, the four 6v6s are running at about 22 watts or so on Tweed mode. Does that sound about right?
Yes, that looks right. That's what I would expect.
Wattage varies depending on the plate voltage, so you have to know which is the value when you set the amp to 6V6. But I think that is a very reasonable estimate.