If you really mean a pentode equivalent circuit, the simplest one for the purpose of signal analysis would be a Norton current source (with i = gmVgk) in parallel with the plate resistance.
You can determine plate resistance and transconductance at your operating point by examination of the tube curves on the data sheet.
You can determine plate resistance and transconductance at your operating point by examination of the tube curves on the data sheet.
Norman Koren's model
Hi.
If you would like to model the behavior of triodes and pentodes, I suggest you use Norman Koren's models. I have implemented triode modelling in Matlab using his model and find it really good.
Norman, together with Stefano Perugini and Mithat Konar have information about the models in their web sites:
http://www.normankoren.com/Audio/Tubemodspice_article.html
Spice Models Survey
http://www.birotechnology.com/articles/VTspice.html
If you want more information in model implementation, I may be able to help.
Cheers,
Rada
Hi.
If you would like to model the behavior of triodes and pentodes, I suggest you use Norman Koren's models. I have implemented triode modelling in Matlab using his model and find it really good.
Norman, together with Stefano Perugini and Mithat Konar have information about the models in their web sites:
http://www.normankoren.com/Audio/Tubemodspice_article.html
Spice Models Survey
http://www.birotechnology.com/articles/VTspice.html
If you want more information in model implementation, I may be able to help.
Cheers,
Rada
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