[Amps] Pspice models for power grid tubes

[Xmitters@aol.com]

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. 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