You can create an artificial center tap as described in this article:
The Valve Wizard: Heater / Filament Supplies
The Valve Wizard: Heater / Filament Supplies
AVOID the center tap connection you have in that schematic on the phone screen. Worst idea.
All that does is inject ripple noise into the filaments.
You can lift the filament with voltage divider and cap as shown in the valve wizard link.
I leave the filament floating most of the time There are only a few cases where lifting the fil potential is required anyways, like in SRPP.
All that does is inject ripple noise into the filaments.
You can lift the filament with voltage divider and cap as shown in the valve wizard link.
I leave the filament floating most of the time There are only a few cases where lifting the fil potential is required anyways, like in SRPP.