Instantaneous cathode current in power tubes.

[Wes]

With a bias meter hooked up to the power tubes of an amp and having set the idle bias-

Why is it that when playing, still having the bias meter hooked up, some amps exhibit
hardly any current change at all while some completely peg out the meters (near or over
100mA) with big signals?

Is this a bad thing? It is only instantaneous right?

[NateS]

By any chance are the ones which don't move cathode biased and heavily bypassed?

[jazbo8]

Or one could be Class A SE and the other Class AB push-pull...

[Merlinb]

Another possibility: A warm biased LTP can cause one one side of a push-pull pair to increase it's average conduction more than the other side.