Tubes
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How Vacuum Tubes Work
This Page is a courtesy of www.vacuumtubes.net & Svetlana Click here to visit our website [The Basics] - [Inside a Tube] - [Why are Tubes Still Used] - [Using Tubes] The BASICS Back in 1904, British scientist John Ambrose Fleming first showed his device to convert an alternating current signal into direct current. The "Fleming diode" was based on an effect that Thomas Edison had first discovered in 1880, and had not put to useful work at the time.