>In a message dated 4/30/98 2:16:52 AM Central Daylight Time, measures@vc.net
>writes:
>
><< - - How does one determine how much tungsten carbide has been formed?:
> . Tungsten is a better electrical conductor than tungsten-carbide, so
> one can tell how thick the tungsten-carbide layer is by measuring the
> decrease in filament current as the process takes place. >>
>
>Ya, but if the tungsten-carbide layer is at the surface, it's cross-sectional
>area must be quite small compared to the entire filament. I would think
>that's a difficult measurement to make.
As I understand it, a digital instrument is used to measure the filament
current.
>Admittedly, Eimac's explanation was a little high level.
Based on what I know about the recarburization process, Eimac's
thorium-explanation does not wash.
>Who knows? I do know that the thorium tends to make the
>filament less brittle and easier to handle.
>
>BTW Rich, do you still have that Web site with your manuscripts regarding
>amplifiers? I have a couple of friends here who would like copies of some of
>the articles you wrote.
>
yes, Chris
www.vcnet.com/measures
cheers
Rich...
R. L. Measures, 805-386-3734, AG6K
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