Millions of thermionic valves were made and used long before the pheonomen of the "Cat's Whisker" gave rise to the transistor and integrated industry that followed on.
A link (below) will take you to a short video that graphically shows how much work is involved in the making of a simple triode valve. Most of the process is very traditional, although the use of some modern technology is also evident. This is a most delightful "silent" French film with absorbing background music.
The glassblowing tradition was what brought the Dutch company Philips to electronics.
http://dailymotion.virgilio.it/video/x3wrzo_fabrication-dune-lampe-triode_tech
Wednesday, 15 April 2009
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