Rebuilding TV CRTs used to be quite common.   Slice neck off tube,  "re-gun",  
melt neck back on,  suck out air, profit!.   A few years back I found a place 
that would re-gun (or attempt to) the CRT from an HP9100A calculator.

------------------------

>  The only "rebuildable" (vacuum) tubes I've seen are things like very 
high power transmitting tubes, high voltage rectifiers, and high power 
ignitrons or mercury arc rectifiers.
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