Class B & AB audio amplifiers - an introduction - Part 2

In part 2 of the introduction to audio amplifier classes series, I look into class B and class AB amplifiers.

Note: Another bit of confusion is Class AB1 and AB2 which is for the biasing of vacuum tubes. I've seen people try to apply it to transistor amps which makes no sense to me.
Misspelling note: should be "dissipation" in class AB disadvantages.

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