[Amps] vacuum variable caps

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Mon, 06 Sep 2010 12:31:47 -0400, mikflathead at aol.com wrote:

> 
>
> Does it make any difference if I ground the shaft side or the other side of a variable vacuum cap? Mike

REPLY:

Grounding the non-shaft side will add some stray capacitance from the
shaft side to ground. On the higher frequencies, this may be too much.
A good example is ten meters. Most amplifiers have trouble enough
getting a reasonalbe Q on ten because of accumulated stray
capacitance. Adding more by grounding the non-shaft side of the tune
cap just makes it even more difficult.

73, Bill W6WRT