[AMPS] Oscillation

[measures]

>
>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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