Why do NOS Tubes sound better than new tubes?

Is manufacturing really that backwards in todays techno world? What is the real reason that todays tubes cannot equal the tubes of yesteryear?

tubed108-26-2011 2:39pm

nonoise Details Discussions Posts This discussion Message User 10,544 posts 08-29-2011 at 06:33am Copy Comment URL Report Comment Edit Delete I was told that new tubes aren't allowed to be made with the same rare metals that NOS tubes use. They are heavily regulated and folks high up on the food chain don't want them readily available to anyone who might want to use them for something else. All that leaves the newer ones with are better engineering, closer tolerances, innovation and cleverness.