|
Bias voltage on the grid determines how much current flows through the tubes. Make it too negative, nothing gets through. Too positive the tube will no saturated full on or clip.
Assuming were talking about an audio amp - the AC audio signal will ride on the DC bias voltage.
In other words the audio signal will push the grid voltage a little bit more negative or more positive than the bias. Set the bias wrong and the top or bottom will be clipped out distorted.
|