> Mistuning apparently does not cause instability. The circuitry that
> generates the VHF signal that starts the oscillation comes before the
> tank circuit. This source is the series resonant circuit that
> consists of the anode-C's X (reactance) to gnd, the anode-lead's X,
> the VHF suppressor's X, the DC-blocker's X, and C-Tune's XC to gnd.
> Since the X of the anode-C is many times higher than the X of C-Tune,
> adjusting C-Tune from max to min typically changes the resonant freq.
> only a few %. Whenever anode current changes quickly, said resonant
> circuit rings and generates a damped wave signal.
What rise/fall time is needed to start something ringing at (say) 120MHz?
Steve
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