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RE: Most are Class A/B...

That's not completely true. In a Class A circuit the devices are run in the most linear region of their operating curve.

With tubes this means the plate voltage, idle current, load impedance and drive voltage are selected so that the tube operates as distortion free (linear) as it can (without feedback as the starting point).

In a Class A/B circuit the output device can never be said to be running Class A even when cutoff (clipping) is not reached (the "A" part of Class A/B) because (at least with tubes) the voltage, idle current and load impedance is not correct for true Class A operation.

So the thing that the "A" part of Class A/B shares with true Class A is that the device never cuts off. But that's the only thing that's the same.

What I'm trying to say is, there is more to Class A than whether or not the device cuts off.

Class A is when the device is run in the most linear way as possible and that, of course, precludes running in cutoff.

So to be redundant, All Class A circuits avoid cutoff but not all circuits that avoid cutoff are Class A.

Tre'
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