[Amps] 4-400 W Screen Voltage

[David C. Hallam]

I have built several passive grid driven tetrode amps with normal screen 
voltage applied.  One was with 4-400's and the other a 4CX1500A.  I 
currently use a Johnson Invader 2000 which is a passive grid driven pair 
of 4-400A's.

David
KW4DH

On 1/28/2012 9:27 PM, Carl wrote:
> I dont see any reason why not. Ive done it with 4X1's and passive grid is
> used by a few current manufacturers with external anode tubes. National did
> that back in 1962 with the NCL-2000.....the rest of the world is finally
> catching up.
>
> Carl
> KM1H
>
>
>
> ----- Original Message -----
> From: "Jim W7RY"<jimw7ry at gmail.com>
> To: "AMPS"<amps at contesting.com>
> Sent: Saturday, January 28, 2012 8:18 PM
> Subject: [Amps] 4-400 W Screen Voltage
>
>
>> Has anyone run 4-400s with screen voltage successfully in an amplifier
>> with passive grid (50 ohm load for the grid drive)?  I have the hankerin
>> to build an amplifier with 3 of them.
>>
>> It will be 160-10 meters.
>>
>> Thoughts?
>>
>> 73
>> Jim W7RY
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