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There has been countless discussions of this topic on the Antique Radio Forum. The one thing that I came away with was that unfortunately Super Glue has a different temperature coefficient and has been known to actually crack the glass envelope of a tube and even pull a piece out of it. So, it is frowned upon.
With signal tubes, Elmer's Glue was mentioned many times. But tubes that get very hot, like power pentodes, rectifiers etc. may find it to be improper.
Several have suggested using sensor safe silicon sealant. No real negative advice against it.
As Bob has mentioned, a good wrap of black electrical tape will secure the base whilst you are testing the tube. You certainly don't want to flex the base and break off the wires at the glass seal!
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