>  the 6AC7 (9000 umhos) instead. 
> Either one far outshines the 6K7 with a 
> transconductance of 1650 umhos.  I 
>  think I have a 6K7 around, and it would 
>  be interesting to compare

I think the 6K7 has a grid cap on top of
the tube but the other tubes mentioned
don't.

- Jim W4ENE


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