Making Mullard thermionic radio valves, a film
Technology has moved on at an amazing pace and today tiny integrated circuits are taken for granted but it was not so many years ago that our televisions and wireless sets (radios) contained large glowing thermionic valves, or vacuum tubes as our American cousins called them.
Here in Britain Mullard was the best known brand for radio valves. The film below demonstrates the making of Mullard valves with an initial look at the components that make up the valve and how they are assembled and then goes into the Mullard factory to show manufacture and testing in process.
I have handled many radio and television valves in my time and have looked through the glass envelope at the components inside, this film opened my eyes to how involved and hands on their assembly was.