[Arran]

Jayce, make sure that you give the audio output circuitry an overhaul before you play the set too much, as well as the power supply. Leaky caps and drifted resistors can make short work out of audio output tubes by screwing up the bias, and can burn out things like audio interstage transformers or tone control pots. The audio amp always runs on the highest voltages and the highest currents, so things often fail there first.
Regards
Arran