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

tzh21y Details Discussions Posts This discussion Message User 1,654 posts 08-29-2011 at 11:57am Copy Comment URL Report Comment Edit Delete I have heard the same thing about the metals used and that they are not available anymore.