I dont believe that you will have a stability issue, even with plain
bare sockets mounted at chassis height, in GG and on those bands.
My 4x 813 160-10M grid driven Class C amp has them mounted so the top
of the twist lock socket is at deck height. It also required a touch of
neutralizing but is stable as a rock with 2800V.
Carl
KM1H
----- Original Message -----
From: "jonathan white" <jonathan.white20@btinternet.com>
To: <amps@contesting.com>
Sent: Sunday, March 08, 2009 10:09 PM
Subject: [Amps] 813 screen
> Hi
> I hope you non`t think this trivial but.....
> Can anyone confirm one way or the other the placing of the internal
> screening plate at bottom of tube near base which is connected to a
> pin,and is grounded I believe
> If the 813 is like the QQVO6-40a tube which had a similar internal
> plate
> this had to be placed at deck height or instability was a problem.
> I have decided to do something different and build a 3 band amp using
> 4x813 for 160,80,40..
> Yes I know these are old tubes but they just look dam classy if you
> know
> what i mean!.
> Just getting ready for the flack!
> Jon G8CCL
>
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