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The internet has all kinds of mistakes on it. There are examples of a single class-C transistor and they wrongly say it is operating in class-AB. Here is one of them:
A class AB amp is literally defined as having a conduction angle greater than 90 and less than 180. There's no reason a class AB can't be made with a single transistor. Take any class A amp and overdrive its input into cutoff and you will get class AB operation.
Or when you have feedback or predistortion to correct for nonlinearity, but need better efficiency.Thanks everyone!
So what I gather is that a Class AB amplifier designed using a single transistor can be used in applications where linearity is not a very important parameter.