Distortion and Stability in output
It is well known that the
output of an amplifier does not have a voltage waveform exactly a replica of
the input signal. Because of the presence of inductance and capacitance in the
tubes and circuits, the various frequency components of the signal are affected
by different amplifications and phase shifts. Also because of nonlinear action
of the tube itself, the output voltage is not exactly prop optional to the
input voltage. Again, if one or more of the bias voltages E0, Eb0, etc., varies,
