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

[Hardy Landskov]

Years ago we used to tie the screen and control grids together and ground 
them in 4-1000's. It was very stable but took a lot more drive.
Hardy  N7RT

----- Original Message ----- 
From: "Paul Kraemer" <elespe at lisco.com>
To: <donroden at hiwaay.net>; <amps at contesting.com>
Sent: Monday, July 20, 2009 12:10 PM
Subject: Re: [Amps] Grounded Grid(Screen) 4CX250B power gain


> Anyone have a comment about the theory behind connecting the grid through 
> a
> resistor to the cathode in a "grounded grid" amp because grounded grid it
> isn't. Does the screen being grounded act as the grid in a low mu triode 
> in
> that configuration? The article mentioned earlier says it works. I am
> curious how well it works and what the gain is.
> Paul K0UYA
> ----- Original Message ----- 
> From: <donroden at hiwaay.net>
> To: <amps at contesting.com>
> Sent: Sunday, July 19, 2009 9:19 PM
> Subject: Re: [Amps] Grounded Grid(Screen) 4CX250B power gain
>
>
>>I had a 30L-1 "lookalike" that used four 250Bs in GG. The control
>> grids were grounded through resistors and the screen terminals on the
>> sockets were bent over and soldered to the metal socket.  Don't know
>> about tying the cathode to the control grid.... ( ????? )
>>
>> Don WA4NPL
>>
>>
>> Quoting Hsu <hsu4qro at gmail.com>:
>>
>>> Hi, George,
>>> I just  modyfy the Henry TEMPO 2001
>>>   convert the 3CX400A7  to 4CX250B in GG configation, tied the
>>> cathode and G1(serial a 100ohm resistor) together.
>>>     I'll test it today.
>>>      73!Hsu
>>> ----- Original Message -----
>>> From: <gdaught6 at stanford.edu>
>>> To: "Hsu" <hsu4qro at gmail.com>
>>> Sent: Monday, July 20, 2009 5:26 AM
>>> Subject: Re: [Amps] Grounded Grid(Screen) 4CX250B power gain
>>>
>>>
>>>>> Nin hao George,
>>>>>    Have your built the amplifier like this GG configation?
>>>>
>>>> No, I haven't built one in GG.  I always use "passive grid
>>>> configuration", with a
>>>> resistor driven by the exciter, and the grid just attached to the
>>>> top of the resistor.
>>>>
>>>> 73,
>>>>
>>>> George T Daughters, K6GT
>>>> CU in the California QSO Party (CQP)
>>>> October 3-4, 2009
>>>>
>>>>
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>>
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