[Amps] Pspice models for power grid tubes

[R.Measures]

On Jan 26, 2006, at 7:30 AM, Xmitters at aol.com wrote:

> Hello:
>
> I'm new to this list and this is my first posting.
>
> I do a great deal of circuit analysis for broadcast and communications
> transmitter circuits and I would like to find either models, or the 
> algorithm for
> creating models for power grid tubes. The audio sector has done a 
> great job with
> models for audio, but invariably, those models do not include modeling 
> of the
> grid current and screen current. These parameters are important in 
> class B
> and class C.
>
> Also I am in need for a set of constant current curves for the 4-400A. 
> The
> only curve given on my Eimac data sheet is for 500 volts. I need 
> curves for
> other screen voltages; maybe these extra data exists, maybe it doesn't.

The curves for 500v may be converted to other voltages by applying the 
3/2 power law.

>  This
> information is going to be used in the design of a screen impedance 
> modulated form
> of the Doherty amplifier. This is used in the Continental Electronics 
> 317C-3
> 50 kW AM transmitter if you're familiar with that. This system I'm 
> designing is
> going to be for the 160 meter ham band. I think a pair of 4-400A 
> tetrodes
> will work well in such a circuit :-)
>
> Thanks for your help :-)
>
> Jeff Glass, BSEE CSRE
> Northern Illinois University
> WB9ETG since 1970
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>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org