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

marakanetz Details Discussions Posts This discussion Message User 5,473 posts 08-26-2011 at 07:23pm Copy Comment URL Report Comment Edit Delete Back then everything depended on the tube quality and stability whereas now there's an improvement of circuit engineering.