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

tpreaves Details Discussions Posts This discussion Message User 2,687 posts 08-26-2011 at 08:57pm Copy Comment URL Report Comment Edit Delete Not all NOS tubes sound better than new ones. The ones that do are because of the reasons cited in the above posts.