[Amps] Fan for SB220

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Fri, 17 Dec 2010 09:36:14 -0600, donroden at hiwaay.net wrote:

>I'm supprised no one has mentioned adding a black aluminum shield  
>between two 3-500s to help prevent the two tubes from radiating heat (  
>and rf ) into each other.

REPLY:

I question whether tubes in parallel can radiate RF into each other.
There is a small amount of capacitance from plate to plate, but the
voltage at each end of the "capacitor" is the same, both in phase and
amplitude, so no current would be flowing unless the tubes are
mismatched for some reason.

Correct?

73, Bill W6WRT