Martin, glad to see you are a Homebrewer.
Since I can't seem to upload pdf files or schematics, here is the next best thing:http://www.clarisonus.com/Archives/TubeTheory/ClassC.pdf
Look at page 3, right side for the waveforms.
Consider a Class C broadcast transmitter transmitting on 1 MhZ. The input waveform to the grid, an RF sine wave, will have a total period of 1 microseconds. The positive
portion of the grid waveform will be going from zero voltage to maximum voltage back down to zero voltage in 500 nanoseconds.
1. The grid drive will be a sine wave of 200 Volts Peak-to-Peak and we are only interested in the positive portion or the 100 volt positive segment
2. (From bottom to top) the DC grid bias supply is set to -90 volts, which is connected to a 10K resistor which is connected to a 2.5 mH choke and then to the grid,
3. Plate voltage will be 3000 Volts with a maximum current of 0.5 Amps
4. The grid voltage rises from zero to +10 volts at the 50 nanosecond time click, grid and plate current starts to flow, but not much
5. At 100 nanoseconds the grid voltage is at 58 volts and plate current is significant
6. At 250 nanoseconds, the grid voltage is 100 volts maximum and the plate current is maximum, input power at this time is 1,500 Watts
7. From 255 nanoseconds on, the grid voltage starts to fall, the plate current starts to fall
8. At 450 nanoseconds, the grid voltage starts to fall below + 10 Volts and the plate and grid current tends toward zero,
9. At 500 nanoseconds the grid voltage finally goes to zero, plate current is zero
So the time between about 100 nanoseconds and 400 nanoseconds is where the majority of energy is dumped into the resonant circuit, usually a Pi-Network or Pi-L network circuit which not only stores energy, but provides an impedance match between the tube plate and the output circuit.
I hope this helps
Phil – AC0OB