A vacuum tube operated Class C audio amplifier is not feasible, either in single or push-pull:
Since the plate current only flows 120 degrees, even in push-pull, only 2/3 of the cycle is reproduced and the resultant distortion would be unacceptable for audio
Tank circuits, which replace the missing portions of the cycle, can't be used in an audio amplifier because they only operate on one frequency
A & B
None of the above
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