[Amps] Question about TPTG oscillators

[R L Measures]

On Aug 29, 2006, at 7:27 PM, Bill Turner wrote:

> Recently someone posted to the effect that in a tuned plate tuned grid
> oscillator, if the anode resonant frequency was lower than the grid
> resonant frequency, the tube would not oscillate. Did I catch that
> right? And does this apply in a grounded grid oscillator as well as a
> grounded cathode one?
>
> So, in the context of the dreaded grounded grid VHF
> para-you-know-what, is it really that simple? Keep the cathode-grid
> resonance higher in frequency than the anode-grid resonance and it
> won't oscillate?

A 3-500Z's grid resonance is c. 88MHz.  I know of no 3-500Z amplifier  
that has oscillated below 95MHz.
>
>
> -- 
> Bill, W6WRT
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R L MEASURES, AG6K. 805-386-3734
r at somis.org