Just- I've purchased quite a few tubes off the web. There is always the possibility of getting a tube with less life than stated, but I try to stick with sources that actually measure the tubes and give the values per section. I also try to stay with sellers that have a good history. So far, no serious problems. Good luck.
Buying tubes 2nd Hand
looking for others experience on buying tubes from private parties. Seems like there is a lot of room to fudge on the age of a tubes when buying "NOS" tubes. Dealers tend to be fairly trustworthy but they charge a serious premium. How have your experinces via A-Gon or Ebay?