So here are the modifications I did to the amp that I mentioned a few days ago, just to keep you all updated. It works pretty well and sounds surprisingly good!

Basically, I ditched the tone controls completely, but modified the treble control so that it is now the gain control. I had to gang both output tubes together since it needs to be mono. For the output trannies, I just tied them together at the plates of the output tubes, and then wired the outputs in series. Tying them together in parallel at the plates would halve the turns ratio, and then hooking up the outputs in series would double it. Thus, the impedance ratio remains the same.

If I was much more invested in it, I wouldn't hesitate to throw in an interstage tranny and convert it to Class AB. This method would be much easer than trying to add a phase-inverter stage.

Of course, I intend to get an isolation transformer, because otherwise you're grounded to the line! Sure that was standard practice back in the day, but we have better and safer ways of doing things now! Using an isolation transformer will allow me to ground it properly with a three-prong power cord.

It still has all of the original capacitors, and they are all still working. However, replacing the caps is still the next thing on the agenda for this amp.

And if anyone is wondering, this amp has not been permanently modified. Everything I've done is completely and easily reversible.