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Quotes from Nelson Pass

Pass: " Class B has no bias current, Class AB has a moderate bias current, and Class A has a high bias current. Class AB push-pull amplifiers are hybrids between Class B and Class A. Class AB run Class A at low power levels, and become Class B amplifiers at output currents determined by the bias . " {emphasis added}

Pass: " Push-pull amplifiers generally operate in Class A mode up to a point where the output current is twice the value of the bias current. In the Class A region, both halves of the circuit share the signal simultaneously. Beyond that the signal is handled solely by the push (+) half of the amplifier or the pull (-) half. "

What might be fair to say is that A/B amps don't cease being class A when more power is demanded: only the peaks , '+' or '-' of the signal operate in class B mode. There is nothing magical about the shifting.

Dmitri Shostakovich

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