> >The 3-500Z getters itself through a Zirconium coating on the anode. This
> >is the coating that gives the anode a dull powdery gray color. Zirconium
> >absorbs different gases at different temperatures, with optimum gettering
> >for most gases occurring around 1400 degrees C. Optimum absorbing of
> >hydrogen occurs at 350 degrees C.
> Very interesting. Is there a similar effect with the graphite-anode
> 73, Bill W7TI
The effect is the same. The same materials are used.
Graphite tends to release more gas and other impurities more than
hard metals, but otherwise gettering operation is about the same.
External anode tubes are different, because obviously the anode
can't be operated at high enough temperatures to allow a gettering
agent to be mixed in or coated on the anode. They getter through
73, Tom W8JI
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