I think I finally got things worked out on the curve tracing and here are a set of curves for the Aa. I traced the two samples I had and the mean fit error for both samples put together of about .05ma which suggests both tubes were pretty close to each other.
I'll let the pics do the rest of the talking.
dave
Aa plate curves
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dave slagle
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Aa plate curves
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- this is both sets of data loaded in and the fit for the LTspice model.
- Picture 13.png (29.29 KiB) Viewed 3740 times
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- zoomed in at 0 to 1ma and thins look pretty well behaved.
- Picture 12.png (26.72 KiB) Viewed 3740 times
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- The actual Excel data with markers for comparison.
- Picture 11.png (29.67 KiB) Viewed 3740 times
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- here are the LTspice curves from the model i made.
- Picture 9.png (24.57 KiB) Viewed 3740 times