Elizabeth is right.
NOS tubes in any quantity are all gone, used, and burned out, and have been since the 80's.
Only the Russians and Chinese have made tubes in any quantity since then.
The Russian tube factories are controlled by the Russian mobs, and tube types come and go. The Chinese tube quality is very "spotty".
Try and find what is the best of new tubes, and buy a lifetime supply!
NOS tubes in any quantity are all gone, used, and burned out, and have been since the 80's.
Only the Russians and Chinese have made tubes in any quantity since then.
The Russian tube factories are controlled by the Russian mobs, and tube types come and go. The Chinese tube quality is very "spotty".
Try and find what is the best of new tubes, and buy a lifetime supply!