[Amps] Grounded Grid(Screen) 4CX250B power gain

[donroden at hiwaay.net]

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 at 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 at 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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