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[AMPS] Emission from Thoria Filaments

To: <amps@contesting.com>
Subject: [AMPS] Emission from Thoria Filaments
From: measures@vc.net (Rich Measures)
Date: Thu, 30 Apr 98 07:57:00 -0800
>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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