As for the tube, a US made first gen tube is quite shock resistant, many of the russian tubes are very very fragile. It will break and lose vacuum and that will be that. Anywhere from 1hr to 2000 hrs on a Russian 1st gen. US 1st gen should get you a couple thousand if used properly, maybe more. You would get tired of it before you used it up.
Russian stuff is more likely to break or fail before the tube is actually used up.