Lots of speculation on the blue dot.
I don't think anyone has come up with an absolutely answer. Just guessing,
etc.
Yes of course. There is only one right answer.
http://www.tube-tester.com/sites/nixie/data/in18.htm
The blus spot is the mercury glowing if Ucc is too low.
All you need to do is drive the tubes without applying an Ucc at all.
Dieter
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