jaymanaa
RIP 1961-2018
Resurrections are fine but it has to be about more than just nostalgia. Their products need to be unique (in quality or longevity for example) or fill a niche not being served now, not just price. With all the people making 300B's, that is a tall order. Wish them good luck - they are going to need it.
On the other hand, someone could make a pretty business bringing back the 10Y, the 50 and some other thoriated filament tubes. They may attract unwanted attention from the big boys in China and Russia however.
I think the hardest part of making what we call "Real" vintage tubes is the people that made them are gone. It is said that the particular skills and talents for this work was handed down through generations in the same families.
I think you can re-make tooling, reverse engineer construction, and re-create materials, but the human factor is what's missing.