[EdHolland]

So - a little data. I measure our line voltage this morning. assuming my multimeter is accurate, mains in is running around 123 - 124 Volts. That is quite an increase from 117 V.. I measured line current at 0.77 A, and that remained stable over a good period of operation. So this tells us a total power ~94W.

Poking around the audio amplifier chassis suggested the HT was not so far out of spec for the service sheets I have. Voltage on the 6V6 cathodes (self bias arrangement) was 12 V where 15 V is called, so these may be running a little hot, but I need to get the grid voltages as well for the full picture.

I'll do some calculations and try a bucking transformer next time we are here. I should also get a variac, as I've become sucked in to this ancient electronics business for good