Something that started showing up in AM broadcast transmitters several
years ago is a third harmonic resonator on class C amps. This vastly
improves the efficiency of these amplifiers. Without it, the final tank
circuit tries to force the plate voltage to be a sine wave, pulling the
tube out of saturation "at the edges" of the conduction pulse. Putting in
the resonator allows the tube to stay in saturation (at least much more
so), decreasing plate dissipation and improving efficiency.
        This was introduced something like 50 years after class C amplifiers
were first used in AM transmitters. You'd have thought it was a mature
technology by then!

Harold

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