>
>Hi dave
>
>> Graphite anode material is generally used in high-vacuum tubes
>to provide
>> [continuous] "getter" action which aids in maintaining the high-vacuum
>> state in larger high-vacuum envelopes. "Getter" action reduces residual
>> gases left over from the manufacturing process and gases which are
>> generated by the other elements of the tube during normal operation. The
>> graphite surface is subjected to special processing to improve it's
>> thermal handling capabilities as an anode.
>
>Graphite is not listed in the lists I have of gettering agents. Can you
>tell me where it is listed as a gettering agent?
>
? It isn't. Graphite does not getter gas. It stores it. When highly
heated, graphite releases gas.
>The only thing I can find is a discussion of how graphite tends to
>release gas longer than metal anodes when the tube is being
>pumped down.
>
? The person who designed the AL-1500 amplifier, apparently chooses not
to discuss the 8877 that died from gold sputtering.
>
>
>73, Tom W8JI
>w8ji@contesting.com
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
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>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
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