>
>Just curious!
>
>If I key my amplifier (any amp) and run the tank cap from minimum to
>maximum and the grid current shows no change, can I safely assume the amp
>does not have a oscillation problem??
HF, yes. VHF, not a safe bet. The trouble with VHF is that tuning C1
makes very little difference in the anode circuit's VHF resonance. The
major determiner is the (fixed) anode C of the tube.
>
cheers, Ed.
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