[Phlogiston]

Have you checked the current consumption in your output stage? You might be able to adjust the bias to lessen it, or it might be too high. I have seen a radio that seemed to work fine run a great amount of current through a 42 tube. The tube did not red-plate but the transformer got hot.

I got the power co to turn the voltage down at the shop/museum to 119V from 127. It is the only building on that transformer.

As I recall it is 13 turns and 13 turns and 13 turns - 3 taps (5 wires) on that band 2 osc coil.