I don't own a nixie clock long enough myself, but I've heard of several examples of nixie clocks running for a long time where the tube of the 1st hours digit had to be replaced. It seems that no cathode poisoning prevention was used back then though. The future will tell which of the current life prolonging measures is the most efficient. Turning the nixies off when nobody is looking seems to be the obvious choice. Now all I need is to find a way to hide that ugly PIR sensor ;-)
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