The following video shows a triode tube (“valve” for those across the pond) being made by hand. Incredible.
Update: Youtube has quite a few videos on tube making. The following video is not as artistic as the one by F2FO, but explains the process.
The following links are old films from the Philips – Mullard tube factory:
- The Manufacture of Radio Valves — Part 1
- The Manufacture of Radio Valves — Part 2
- The Manufacture of Radio Valves — Part 3
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Source.
Hat tip: sewatt.com (registration required).
