How to create SPICE models for tubes/valves?

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Could anyone explain how to calculate those values from datasheet plots?

I do my triode models by iteration using the Koren equations. I wrote some software to aid in matching a plot. You can change parameters and then run the curves until you get a match that is acceptable. I don't include a "user manual" but there are examples included with the download.

K4BPM PSPICE Home Page

I was going to add tetrode/pentode equations, but never got around to it :(

Jim
 
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