[Amps] grid resonance

[R L Measures]

On Aug 2, 2006, at 4:14 PM, carl s. wrote:

>    How would one go about checking the resonant frequency of the grid
> ckt of a tube such as the 572B or the 811A or any similar tube for  
> that
> matter ???

Couple a dipmeter to the grid's grounding conductor, the same way one  
measures the resonant frequency of a 1/4 wave vertical antenna.**
   Below the resonance freq. of the grid, it is difficult to make a g- 
g stage oscillate because the grid acts as a shield between the input  
and the output. However, above the grid's resonant frequency, it's a  
whole nuther ballgame.

** a 3-500Z grid resonates c. 88MHz.

>     something I never thought about before !!! I just built the  
> amps and
> they worked or didn't work.!!!
>      carl / kz5ca     ( maybe I can still learn something (at my  
> age?) )
>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org