The problem that I have experienced with rebuilders is that they
haven't been able to get the glass in sizes that used to be common,
i.e., a blank in the size of a 3-1000Z diameter, from Germany
(Shott?).
So they have attempted in some cases to re-seal a cut tube, using
standard glass tooling/lathes, etc. The yield can be awful. I had a
lopsided Machlett MIL LPT-44 triode made. Another one woudn't seal.
As Rich said, Ceramic Metal technology is rebuildable if there is a
demand. There are some tubes such as the RCA Cermalox designs, which
no one wants to touch in the rebuilding biz. Companies like CPI/Eimac
will rebuild their own larger tubes, again, depending on the market
demand.
Suggest taking a look online and type in Google: "Tube Rebuilder" or
"Power Tube Rebuilder" for further info.
73
John
K5PRO
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