• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Getting transfer characteristics

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Maybe a trivial question, but I could not find a simple answer:

Taking the curve family of a tube (triode, pentode) and for a given load line, how can I determine the output current versus input voltage curve?

In other words: I have the anode current versus anode voltage curve family, where the parameter is the grid voltage. Now I draw a load line on the graph. It intersects the curves, and at each intersect point I can read the anode voltage and anode current for some discrete values of grid voltages. My question: how can I graph the anode current (or anode voltage) when the variable (x axis) is the grid voltage?
 
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