i have been running a 4-digit nixie clock off NOS russian tubes non-stop for a few years now. two of the number tubes burned out in that time, one shortly afte

i have been running a 4-digit nixie clock off NOS russian tubes non-stop for a few years now. two of the number tubes burned out in that time, one shortly after turning it on, one a year later. they were socketed and I bought spares so replacing wasn't a big deal, and the 4 tubes socketed in now have been working for years, but ymmv with anything that old tho spares are cheap to carry for such a nice piece :)