What causes the grid on a final output tube to go negative in respect to the cathode upon transmit and what would prevent this from happening?
The reason for my question is that I have a Regency Range Gain that will only key .75 watts and swing to 1.5 watts rather than the 1.6 watts swinging to 10 watts. It has been recapped, resistors checked, aligned and new tubes tried without success. Everything checks out except for the final tube voltage. As you can see on the included pic, the grid...
Tube biasing help
The reason for my question is that I have a Regency Range Gain that will only key .75 watts and swing to 1.5 watts rather than the 1.6 watts swinging to 10 watts. It has been recapped, resistors checked, aligned and new tubes tried without success. Everything checks out except for the final tube voltage. As you can see on the included pic, the grid...
Tube biasing help