Is there an actual difference between AB and A/AB ?


Almost all high end linear audiophile power amps which are not pure Class A sell some story about being Class A up until a certain power output, then switching to AB.

Excuse me, but isn't this actually AB to start with?

The whole point of AB is that you run with some bias current to prevent complete transistor shut off at the crossover frequency. This whole "our amp is Class A up until n watts" seems like hype.

Am I wrong?

Best,
E
erik_squires

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Perhaps audio manufactures should drop the term AB and adopt A/AB to give consumers more info on how the amp operates.  What are the benefits/drawback of two identical 100w amplifier but one is biased for the first 10w in Class A (A/AB = 10/90) whereas the other is class AB from the get go (A/AB = 0/100).