I had four in a 30L-1 look alike. The control grids were above ground
with ( if I remember correctly ) 100 ohm carbon resistors.
Don WA4NPL
Quoting K8MLM@aol.com:
> Hus,
>
> I ran three 4CX250Bs in GG, zero bias in a home brew AMP. That was before
> I knew it wasn't supposed to work, but it did. I was able to get about
> 800-900 watts out with 100 watts drive.
>
> Bob
> K8MLM
>
>
> In a message dated 7/11/2009 8:45:45 A.M. Eastern Daylight Time,
> hsu4qro@gmail.com writes:
>
>
> Hi,
> Anyone have experience in grounded grid a pair 4CX250Bs amplifier? could
> you tell me how much power gain of this configation?
> This weekend, I'm planing to do a tube conversion in my friend's Henry
> tempo 2001(a pair 3CX400A7),I have give up GI-7B due to its
> larger volume.The only choise is 4CX250B.The gride driven configation
> needs screen and grid power supply,so I want to use G-G configation
> (gird+cathode as cathode,screen as grid, due to the 4CX250B grid's few
> power rating, it is low mu triode now).
> But I don't know its exact power gain,anyone can tell me about this?Thanks
> in advance!
> 73!
> Hsu
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