[Boatanchors] 4-1000A in GG question

[bcarling@cfl.rr.com]

Grounded grids will work fine. No need for screen voltage.

Bry Carling

Sent from my WW2 walkie-talkie with android OS, please excuse my brevity.



----- Reply message -----
From: "mac" <w7qho at aol.com>
To: "Paul Baldock" <paul at paulbaldock.com>
Cc: <boatanchors at mailman.qth.net>
Subject: [Boatanchors] 4-1000A in GG question
Date: Wed, Jan 4, 2012 4:41 pm


Five hundred volts on the SG would raise the idling plate current a  
significant amount, probably to the point where the control grid would  
have to be disconnected from ground and a negative bias applied to  
keep the no-signal PA current within the dissipation rating of the  
tube.  Would negate the simplicity of the usual "both grids grounded"  
circuit for some problematical increase in gain (if any).

Dennis D.  W7QHO
Glendale, CA

***********************
On Jan 4, 2012, at 11:17 AM, Paul Baldock wrote:

> All 4-1000A GG amp designs I've seen ground the screen grid. Is there
> any additional gain to be had if you raise the screen up to 500V?
>
> - Paul
>
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