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Rydel's triode model coefficients

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John Branson

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Joined 2011
Has anyone found a way of obtaining the 4 coefficients required by the Rydel model of the triode tube? I have tried various non linear regression tools, all of which failed. I wrote my own version of the LMA algorithm, attempting to deal with the discontinuity in the anode characteristic, but the result is unsatisfactory for practical data entry which is subject to random reading errors. I would welcome an opportunity to compare notes with a fellow enthusiast.
My current interest is the 6336A twin power triode.
 
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