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Speaking about solid state amps...

Posted by mkuller on July 27, 2018 at 13:52:21:
...which are most the commonly used.
In Class A the output devices are on all the time.
In Class B they switch on and off generating "switching distortion".
Class A/B combines the two up to a certain point where they go from A to B.
Tubes and Class D are another kettle of fish.