Hi, try touching CRT monitor or plasma globe with the dud tube. If there is neon, it will glow orange inside. Usually the bad tubes are leaky and don't glow or the glow is a bit purple - sign of a bit of air sucked inside. If this is the cause, the leaky place would have to be sealed and the tube opened and refilled. All nixies I've seen were made from soft glass - very likely to crack during sealing of the refill tubing.
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