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Old 12th Aug 2017, 8:57 pm   #62
David Simpson
Nonode
 
Join Date: Mar 2008
Location: Aberdeen, UK.
Posts: 2,839
Default Re: Free Standardised Valves

Nick & Guys. There are now three different software graph responses to my original old fashioned A4 graph paper Gm graphs, for all the valves I've put out. Equally though, other folk are just using my graphs.
Old fashioned I might be, but I don't have the software, and I suspect many other Forum folk don't either. Hence the simplicity. "Singing from the same hymn sheet" is the quotation which comes to mind. If folk want to keep their Tester/VCM records in a spreadsheet format, then great. Otherwise it means that myself & others will have to spend time fannying about transposing results to study. (Note - study, not gloat).
Don't forget - I repeat - this is not a " My Tester is better than other folk's" competition. If one set of Gm graphs differ significantly from others - for the same valve, then there might well be a calibration issue. In that case - do a "before & after" graph, repair/calibration-wise. Letting us all know what was done would help folk who own the same tester or VCM & would appreciate this sharing of info in the future.
Don't worry about me hunched over a drawing board. I enjoy it. Keeps my brain active, & wrist & fingers co-ordination supple. (There is a joke about ex RAF guys in there). Admitted - I've a drawer full of professional drawing pens, ink, stencils, Rotring/Staedeter/Faber Castel, etc. And used them extensively in a pre-retirement life. Admitted - my graphs could be a tad neater, but all this constant voltage & current observations & tabulations - is jolly time consuming. Time is what I'm short of, I'm afraid. But my graphs, using 15 or 16 points, do reveal reasonable curves.
As I've already said a few posts back - once this project has run its course, maybe a few months, or a year or so, and the valves have passed from folk to folk to folk - then perhaps an acceptable software program could be used( Hey - Barry, Martin, Nick - who's going to donate hours & hours of time to transpose what- 25, 50, 100 other Forum folk's graphs ??)

Regards, David
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