[Amps] grounding grids

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Wed, 29 Jul 2009 23:09:16 -0500, "Gary Schafer" <garyschafer at comcast.net>
wrote:

>
>How then would you account for the reduced IM products of a tube operated in
>GG verses the same tube operated in a standard grid driven configuration?

REPLY:

I can't say. I am not an expert on IMD, but I stand by my previous statement -
simply adding a resistor (or network) in the grid circuit is not negative
feedback, it's just gain reduction. For true NFB, you must take a sample of the
output and feed it back out of phase to the input. 

73, Bill W6WRT