Check out this excellent 1942 documentary film from RCA explaining the intricate manufacturing process involved in the production of vacuum tubes – even detailing differences between metal and glass encased units. And in case you missed it, be sure to check out Paillard’s DIY version of the process. [via Matrixsynth]

[Oop – Gareth already posted this gem. Still it is ripe with awesomeness – be sure to view part 2 if you haven’t already.]