Hi, the pressure in a Nixie tube is roughly 1/25 atm.
Anyway, according to your findings, it wouldn't be related to a too high or too low pressure
How do you draw this conclusion? The ignition process may take longer. When doing the experiments, I ignited the tube at well-defined conditions (i.e. 20 Torr) and then changed the pressure with the discharge still going on. Thus, I can not draw any conclusion about the igniting properties at different pressures, all I can say is that the digit - once ignited - will look about the same at higher pressures.
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