12-30-2013, 08:27 AM
The set will work vastly better with a C battery. The B current will be lower and it will sound better. Depending on the tube it will be from -4.5 to -9 volts DC. I have had good luck with -4.5 from 3 c size batteries in series. It draws virtually no current so they will last for a very long time.
To be technically correct the C voltage, grid bias, should be negative enough to keep the grid from ever going positive in relation to the cathode but not so negative as to cut off the plate current entirely.
keithw
To be technically correct the C voltage, grid bias, should be negative enough to keep the grid from ever going positive in relation to the cathode but not so negative as to cut off the plate current entirely.
keithw
