[time-nuts] So what’s inside that Cs Beam Tube anyway?

[Mark Sims]

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.

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>  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.