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@hiwaay.net>
To: <amps@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@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@stanford.edu>
>> To: "Hsu" <hsu4qro@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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