Right enough, Jac, for day to day valve testing I just use an AVO MK3 VCM (electrode continuity, insulation - cathode cold or hot, gas, etc.), plus AVO's method of determining Ia & mA/V. Likewise - fo

Just wondering Jac & Martin, but not wishing to stray too far off topic, seeinng as you guys both live in Germany and share an in-depth expertise in valves & valve testing, re the Tek 576 & the Metrix

I'll echo Jac's point on enjoyment from producing & studying curve charts. Re Prof. Tom's query regarding use of a Tone Generator - if one can visually, using a scope, study a valve's grid i/p signal(

PS Have earlier this evening some pictures of past related projects. Dave

Some folk reading here about gm in mA/V or Transconductance in micromhos, might wonder why folk hand-draw graphs(like this old fool), or rely on a Tek570, or use an excellent modernised/hybridised 576

Its great to read about other folk's projects. Certainly those relating to valve/tube testing. It also enhances my belief that hybridisation of vintage T/Eq with other vintage items &/or modern analog

Some folk might ask why a "Standardised Valve/Tube requires "pure" DC applied to all electrodes for the standardising process. Answer - because the manufacturers have always tested their valves with D

Don't wish to wander too "off topic" on my first venture onto the great Forum. As others have said, a "standardised valve"(Tube)" is a "master" reference valve(tube) used in Valve Tester/Tube Tester c

Once again, many thanks for all the extra input folks, most appreciated. For folk with a strong interest in semiconductors, the later 57* models of transistor curve tracers are exceptional by the look

Many thanks Guys for the informative advice. Particularly regarding considering other models in the 57* family. As emissionlabs says, the AVO VCM163 is highly thought of here in the UK. Never owned on

Hello folks from a newbie. For a number of years I've been interested in vintage radio/electronics as a retirement pursuit. Particularly test equipment, and more particularly valve testers(mainly AVO