I have a model of a vacuum tube pentode. What I'd like to do is get a graph of the change in dynamic impedance looking into the anode at a constant anode voltage as the screen potential is varied. So I guess I'd ground the grid and need some way to sink the varying current as the screen potential changes. And some way to measure the dv/di at the plate.
Does anyone know a way to automate something like this in LTSpice?
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Sweep Vanode from, e.g., 400V to 401V, display slope dV/dI; parameterize Vscreen
In PSpice, if you wanted a curve, you'd do a Performance Analysis Plot.
Probably something similar in LTspice. ...Jim Thompson
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