On 10/31/16 3:28 PM, Richard (Rick) Karlquist wrote:
The ghost of Jack Kusters is now spinning in his grave on
this Halloween night. Jack was a fairly opinionated
guy and it didn't take much to get him excited.
Jack used to rail against people who asked this naive
question. There are any number of reasons why this
doesn't make sense. One major one is that everything
in the tube is thoroughly "cesiated" as Jack put it.
Another is: how do you determine which parts to replace?
Another is: is this economically feasible?
This is a classic question on small volume manufacturing (which I'm sure
these tubes are)..
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. All in the "hundreds of kV" or
"hundreds of kW" kind of range. I think they can rebuild smaller
transmitting tubes (10-20 kW), too.
I've seen a 1930s-40s era Cockroft Walton generator with not just
rebuildable rectifiers, but it's not even sealed: you run the
(diffusion) vacuum pump when you're operating it. The other things are
not exactly a tube, but things like pelletrons, dynamitrons, and
febetrons also tend to have a vacuum pump associated with them.
In this case, there are "user serviceable" parts inside - either because
they're mechanical devices, or because there's a fairly high probability
of internal localized and repairable damage from a flashover.
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