Hammond 290ax 100mA dual secondaries 550ct and 650ct. Classictone 40-18016 120mA 660ct. I am confused as to whether 6L6 or 6V6 are in the plan. I thought we are now looking at 6V6 as that is what came with the amp??? You can run the OT with two parallel tubes to use the 3k-ish primary. Maybe the original amp ran all three 6V6 paralleled with that OT. That would still be in the ballpark for the OT.