I have handled a lot of 5870 tubes, making Nixie watches. About 4,000 so
far.
I have noticed that there are different diameters of lead wires on these
tubes. (The lead wires are cast into the glass header, and the cathodes
are spot-welded to them.) The different wires tend to be mixed together
in a batch of tubes, rather than one batch with heavy wire and another
with thin wire.
The thickest leads are 0.40 mm diameter, while the typical ones are 0.35
or 0.38mm. I just encountered one today with 0.29mm leads.
Do you suppose the factory had different header-making machines fed by
whatever wire they had lying around? I would have expected this
parameter to be controlled a bit better, but I don't run a tube factory.
Thoughts?
--
David Forbes, Tucson AZ
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