audio-talk • Valve Tester

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#1 Valve Tester

Posted: Mon Nov 11, 2019 4:12 pm

by little eddy

Has anyone made one that could be used to measure/calculate gm and Ia?

What about the attached? https://www.valveheaven.com/wp-content/ ... tester.pdf

#2 Re: Valve Tester

Posted: Mon Nov 11, 2019 4:18 pm

by RhythMick

I have a uTracer kit which I will build after I've completed the amps I'm on with

#3 Re: Valve Tester

Posted: Tue Nov 12, 2019 2:44 pm

by little eddy

Am I right in assuming you test the valve with 2 different bias conditions and then calculate gm by (Ia1-Ia2)/(Vg1-Vg2)?