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Hey all, new kid here. I have a couple of questions about tube parameters.
For example, the typical number used to describe a 12AX7's internal Plate Resistance is 62.5K ohms, which seems to work perfectly in the standard gain equation(s). I'd like to know how that number was derived.
I use P-Spice, and have a number of pretty accurate tube models. I've simulated a set of Plate Characterist Curves, and the results are virtually identical to the published PCC's for the 12AX7.
I was told that this number comes from delta Eb over delta Ib, however, I've not been able to get that particular number. I was also told that this delta Eb/Ib needs to be done using a very small incremet of Eb change.
Thought?
For example, the typical number used to describe a 12AX7's internal Plate Resistance is 62.5K ohms, which seems to work perfectly in the standard gain equation(s). I'd like to know how that number was derived.
I use P-Spice, and have a number of pretty accurate tube models. I've simulated a set of Plate Characterist Curves, and the results are virtually identical to the published PCC's for the 12AX7.
I was told that this number comes from delta Eb over delta Ib, however, I've not been able to get that particular number. I was also told that this delta Eb/Ib needs to be done using a very small incremet of Eb change.
Thought?
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