I can’t believe I did that! How could I have been so thick headed to make this kind of mistake?
Look at this picture:
Look at the heater wiring. The tube socket on the right is a 6CA4 rectifier. The two other sockets are for 12AU7s. See the mistake? Both heaters for the 12AU7s are wired for 12.6V not 6.3V.
Now look at this picture:
I have to somehow rewire the heater circuits UNDERNEATH all those other components. This is not going to be fun.
As always, questions and comments are welcome. Just don’t be too cruel.