The previously listed site
) looks interesting. It looks like they are indeed manufacturing the vacuum tubes instead of just importing them. It certainly looks like a specialized skill.
Older Western Electric tube data is available at
I'm working on an iPod dock using the Western Electric 241A. It's also using a couple mercury vapor rectifiers. It'll transmit to my 1940 AM/SW table radio.
For more on the art of building vacuum tubes, see
Video number 1 gives a detailed view of building a precision CRT. Quite a process!