[AMPS] 3-500Z grid to filament resistance?

[2@vc.net (measures)]

>
>Greetings,
>
>I suspect that one or both of the 3-500z's in my SB-220 (original Eimac
>bottles, date code 1977!) may have a grid to filament short.  I've
>measured about 11 Kohms with my DVOM while the tubes are still in the
>socket.  I've heard that I should be seeing around 100 Kohms.
>
>Can someone confirm what the grid to filament resistance of a good
>3-500z should be?

The resistance depends on the grid-fil. potential.  At approx 8000v, 
roughly 2uA will flow in a new tube.  
>
cheers, Charlie

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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