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
Valve Tester
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little eddy
- Old Hand
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- Joined: Sun Nov 09, 2008 2:06 pm
- Location: Manchester
#1 Valve Tester
TD-125/RB250/MC25FL & 'Snail' phono, NAS/SBT with CS4398 DAC, 41MP pre & MoFo Power, still messing with OBs.
#2 Re: Valve Tester
I have a uTracer kit which I will build after I've completed the amps I'm on with
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little eddy
- Old Hand
- Posts: 693
- Joined: Sun Nov 09, 2008 2:06 pm
- Location: Manchester
#3 Re: Valve Tester
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.