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Tubes! (A 1940's RCA video about making them)


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Found when browsing Make:

[url="http://blog.makezine.com/archive/2009/03/tube_manufacturing_in_the_40s.html"]http://blog.makezine.com/archive/2009/03/t...in_the_40s.html[/url]

Describes how they function and how they're made, in fantastic 1940's style :)

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