Which diodes did you select for the filament supply?
I'm not entirely certain that constant current regulation for a filament actually prolongs the life of a tube, but YMMV.
1N5820s.
I'm not convinced either way either. And upon a minute of further thought, the circuit I was thinking of would require a second heater in series or a dummy load. So if I decide to try the current route, it would be in a different form.
I'm just going to build the full wave rectifier with over specd caps, see what I get for ripple and turn on voltage and go from there. I want to get them built and see what they sound like more than I want to fiddle with theoretical benefits at this point.
Oh, there is a connection labeled ground on the board you made me that is connected to the center tap in the hookup instructions. But that was for a PT-2. Would you still suggest connecting it to the center tap at terminal 10 on the PT-7?
From my incomplete understanding of the differences between the two transformers I was thinking ground.