I suspect some confusion is originating because people have forgotton the
definitions of amplifier classes. My memory is that the classes are
generally defined as follows

Class A - conduction is required for 100% of cycle
Class B - conduction is for 50% of cycle (idealised case)
class C - conduction is for <50% of the cycle (requires tank circuit of some
kind, eg rf stages and TV horizontal output stages
Class D - conduction is for varying percentage of cycle as waveform is
defined by PWM.

I do not claim that these are definitive, but this is my memory of them.

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