Many thanks for the advice, I raised the voltage to 180v and the tube seemed to behave more like I would expect and at 190v was ok. However the other tubes in the multiplex developed a hazy pink glow so I quickly turned the voltage back down. I can only conclude that the tube is on its last legs and I would never use anything even remotely suspect so I've binned it. I had another tube that for some reason the bottom half of the digit would not light, is Neon lighter than air and just risen to the top of the tube? Cheers, Paul
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