If you go to Brent Jessee's site he usually has a bit of history behind the tubes and their provenance: who originally built them, for who, and if machinery was left that the newer ones use. It can be quite informative.
Also, I read somewhere (or was told by Jesse himself) that some of the metals used back in the day are no longer available due to their potential and illicit uses in weapons manufactoring. Newer tubes can be made to very exacting standards but they'll never quite sound the same as NOS. That's not to say they'll sound inferior, just different.
All the best,
Nonoise
Also, I read somewhere (or was told by Jesse himself) that some of the metals used back in the day are no longer available due to their potential and illicit uses in weapons manufactoring. Newer tubes can be made to very exacting standards but they'll never quite sound the same as NOS. That's not to say they'll sound inferior, just different.
All the best,
Nonoise