Maich, it was not clear to me initially that you were talking about a switch on the amp to change class of operation.
There are a variety of amplifiers made over the years with this feature- we have built a few ourselves.
Generally, when switching to Class AB, the power supply voltage is increased and the bias current is decreased whether the amp is tube or solid state.
However to be accurate, the amp when in the AB mode is that and that only. FWIW most amplifiers have noticeably smoother sound and greater authority in Class A, as distortion cancellation occurs throughout the entire waveform where in AB mode it does not.
Shadorne, I used the example of 75% to make a point- I don't think there are any amps out there that operate with that much 'enrichment' in AB mode.
There are a variety of amplifiers made over the years with this feature- we have built a few ourselves.
Generally, when switching to Class AB, the power supply voltage is increased and the bias current is decreased whether the amp is tube or solid state.
However to be accurate, the amp when in the AB mode is that and that only. FWIW most amplifiers have noticeably smoother sound and greater authority in Class A, as distortion cancellation occurs throughout the entire waveform where in AB mode it does not.
Shadorne, I used the example of 75% to make a point- I don't think there are any amps out there that operate with that much 'enrichment' in AB mode.