Re: [Amps] 4CX250 Grounded Grid

[Bill Fuqua <wlfuqu00@uky.edu>]

If you have lots of drive you can connect the control grid to the cathode 
and ground screen grid.
But the cathode would have to swing 200 to 350 volts negative to get 
reasonable output power.
This peak situation should produce the same peak plate current as class 
AB1  and 200 to 350 volts bias on
the screen grid. The power gain would work out to be around 3 or 4 at best.
73
Bill wa4lav


At 08:44 AM 1/18/2005 -0500, David C. Hallam wrote:
> The 4CX250B can be operated in grounded grid.  However, you cannot tie the
> screen grid to the grounded control grid.  Normal screen voltage must be
> supplied to it.  Look in any of the Bill Orr handbooks and you will see a
> design for an amplifier using a pair of 4CX250B's in GG.
>
> David C. Hallam
> KC2JD
>
>
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