[R-390] Testing tubes r392

[Randy and Sherry Guttery]

On 8/6/2012 12:20 PM, Steve Toth wrote:
>
>
> I have a TV-7.  What is the process/metjod to convert the 
> 1-120 quality reading to umhos?
>
If you know what umho the tube is rated at - and you assume 
that 100 quality is that number (or near enough) one can 
make some reasonable calculations.
> can you just build a speadsheet for this and use it as a 
> referral?
>
That'd be one way - but I'd probably want to compare 
"quality" reading against the same tube's umho reading in a 
TV-10 (or TV-2 better yet).
> Or, better question, what's the best way to make the 
> conversion?   Just asking....
>
I would take a bunch of tubes - several new tubes 
representing several values of "new" emission; and then a 
couple hand-fuls of older well used tubes - see what they 
read in a TV-10 (or TV-2) and a TV-7 - and that should give 
you some confirmation of "quality" to umho for your tester.

just what I'd do...

-- 
randy guttery

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