[Amps] Burn-in for Eimac?

R.Measures r at somis.org
Tue Jan 17 03:35:24 EST 2006


On Jan 16, 2006, at 3:55 PM, gdaught6 at stanford.edu wrote:

> Hi all,
>
> A few days ago, someone asked "where is the getter on a thoriated
> tungsten filament tube?" [as opposed to an oxide cathode tube...]
>
> I just spent the morning with an expert in rebuilding of thoriated
> tungsten filament tubes, and asked him that exact question.  He told
> me "it depends on the tube."  Then he showed me a few examples:  one
> type was a small disc (zirconium) near the base of the filament
> support pedestal; another was a zirconium wire helically wound on a
> molybdenum pedestal at the center (coaxial with) of the filament
> structure.  He told me "it's almost always zirconium, because that
> stuff LOVES to mop up gases, especially oxygen."

George -- What gettering material is use to mop up nitrogen?
>
> Then came what I consider very important knowledge:
>
> "The getters are heated by their proximity to the filament structure.
>  That's why you should run the tubes at the full rated filament
> voltage for about a hundred hours.  Then you can reduce the filament
> voltage a bit while still maintaining the desired output."
>
> 73,
>
>
>
>
> George T. Daughters, K6GT
>
>
>
>
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>
>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org



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