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Re-using a cathode After its been in air
Apparently it IS possible....
But--At all times the cathode is down to air--it MUST be kept above 100 deg C, as its moisture that damages it, not the air itself....
The Heater could be used for this......
I was reading something about Electron Microscope cathodes and the issues they had with them and their longevity/changing/re-using them etc....
Whether its worthwhile/worth the risk, going to the trouble of breaking a tube open to use its gun in a rarer tube by doing this--that would be up to the rebuilder/owner of the tubes....
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