Valve Tester

If they glow, this is the place to be
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little eddy
Old Hand
Posts: 642
Joined: Sun Nov 09, 2008 2:06 pm
Location: Manchester

Valve Tester

Post by little eddy » Mon Nov 11, 2019 4:12 pm

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
TD-125/RB250/MC25FL & 'Snail' phono, NAS/SBT with CS4398 DAC, 41MP pre & MoFo Power, still messing with OBs.

RhythMick
Old Hand
Posts: 565
Joined: Fri Jun 23, 2017 12:24 pm

Re: Valve Tester

Post by RhythMick » Mon Nov 11, 2019 4:18 pm

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

little eddy
Old Hand
Posts: 642
Joined: Sun Nov 09, 2008 2:06 pm
Location: Manchester

Re: Valve Tester

Post by little eddy » Tue Nov 12, 2019 2:44 pm

Am I right in assuming you test the valve with 2 different bias conditions and then calculate gm by (Ia1-Ia2)/(Vg1-Vg2)?
TD-125/RB250/MC25FL & 'Snail' phono, NAS/SBT with CS4398 DAC, 41MP pre & MoFo Power, still messing with OBs.

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