I have often wondered...
Why is it that with all of our modern technology that we are unable to replicate the quality of NOS tubes? e.g. the Siemens CCA E88C tubes
Or is it that current valve/tube manufacturing companies are already making tubes of similar quality but because of a Hi-Fi/audiophile world's misguided belief that new tubes cannot be as good as those made in the Golden age? i.e. Snob appeal - I have something you can no longer buy or buy at a reasonable cost
Surely, it should possible to reverse engineer the old tubes using the same materials and manufacturing processes (with new manufacturing processes which would be of tighter tolerances than processes of the 40s,50s and 60s.)