GEC BC506 Non electrolytic capacitor question

[Kalee20]

It must go into class C on large signals. As the load is tuned, that should work. It works for CW and FM drivers/PA on transmitters.

when the collector load is inductive? In that case, the cycle is completed with the energy stored in the inductance. At least, that's what I seem to recall from learning about transmitters many moons ago.

Both are correct - and the tuned LC circuit will restore a nice sinewave to a pulsed-current Class C amplifier.

But - it's immaterial really whether the IF signal is distorted - what matters is that the modulation envelope is preserved.

Drive for CW and FM is unmodulated. Even for an AM transmitter it's unmodulated - modulation happens at the anode.

Class C amplifiers are highly non-linear (ask the SSB boys and girls).

See the attached sketch for what happens in an amplifier biased beyond cutoff, with a varying signal. When the amplitude instantaneously drops below a certain level, the output goes to zero even though there is still some small input signal 'there.'