Hi, Don
Could you tell me how much power
to drive this amplifier? how much
power output?your 4CX250B GG configation are same as I mentioned(screen as grid
and the tied the grid and cathode together)?
Thanks!
Hsu
----- Original Message -----
From: <donroden@hiwaay.net>
To: "Hsu" <hsu4qro@gmail.com>
Sent: Sunday, July 12, 2009 12:16 AM
Subject: Re: [Amps] Grounded Grid(Screen) 4CX250B power gain
In the sixties, I had a copy of a 30L-1 that used four 4cx250Bs in GG.
If I recall correctly, the first grids were grounded through 5 watt
carbon 100 ohm resistors. Otherwise you will burn out the grid at
first rf.
Don WA4NPL
Quoting Hsu <hsu4qro@gmail.com>:
>
> 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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