Why aren't new vacuum tubes as good as old ones?

I wonder which the world will run out of sooner, good high quality NOS tubes that are years old or oil?

I hope the suppliers of modern tube technology get their act together sooner and better than those making the new vinyl seem to be doing.

I have to believe though that the ability to make good tubes cost effectively still exists, even if it might not occur that often in practice.

I have no clue really. Too few data points with the tubes I have used personally in recent years. Overall, they seem to do the job well, though getting very quiet ones suitable for use in a phono pre-amp seems to cost a premium.

Definitely a good idea to buy from a reputable source that has the ability to accurately measure and rate each tube. I would expect that at a minimum in general, unless attempting to buy on the cheap, which will surely be more hit or miss in general.

The tubes they are making in Carson City take advantage of modern techniques- computer modeling and lazer cutting so they have avoided expensive dies. I'm very interested to see their production tubes!

LOL! Sorry....every time I read Carson City I can't help thinking of the movie Con Air and Cyrus the Virus. LOL!

USA! USA! USA! USA!

I have high hopes for this venture. It sounds like they will be able to make tubes that are even better than the NOS classics.

Me too Atmasphere. While I find the sound of the newer tubes in some cases to EXCEED any of the NOS tubes I've tried they just don't hold up for whatever the reason(s). I would LOVE to purchase tubes that are made in the US and would hope they exceed the performance of the NOS but retain the quality and longetivity that the Chinese tubes in particular are seemingly lacking.