What I find interesting about NOS is how much of a difference they make even in relatively inexpensive gear. Recently, when I was stocking up on NOS for my main amps, I bought a Mullard tube set (Amperex for the 12AT7) for the Jolida 302 in my office. I had tubed it with Svetlana EL-34 and Telsa. It was a very significant upgrade in sound even if the tube cost was more than the cost of the amp. Given how compulsive people seem to be about the rest of their cables and tweaks I'm always suprised by the reluctance to go with NOS tubes.
