Posts by GwynEaves

    Hi..just connect the heater pins 4 and 5 across the filament winding with a CT on the filament winding. If you don't have a real center tap, use two 100Ω resistors connected between each filament lead and ground. That's all. DON'T GROUND PIN 5. DON'T GROUND ONE SIDE OF THE HEATER SUPPLY.
    That info applies to using AC voltage to heat the tubes. But if you will be using DC to heat the tubes, then ground one side of the dc supply.

    assembly circuit