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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