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Audion - Wikipedia

    https://en.wikipedia.org/wiki/Audion
    The Audion was an electronic detecting or amplifying vacuum tube invented by American electrical engineer Lee de Forest in 1906. It was the first triode, …

Audion Vacuum Tube - History Computer

    https://history-computer.com/the-audion-vacuum-tube/
    The Audion Vacuum Tube was invented by Lee De Forest in 1906 allowing the amplification and detection of weak radio signals.

Audion Tube : Innowiki

    https://www.innowiki.org/audion-tube/
    In 1906, Lee de Forest invented the “three-electrode Audion” vacuum tube. The Audion acts as an amplifier, transforming quiet electric signals into loud ones. Originally de Forest wasn’t quite sure if the Audion had any practical application. That quickly changed. Audions efficiency boost voice over telephones, enabling long-distance calls.

How the Audion Was Invented, January 1947 Radio ... - RF Cafe

    https://www.rfcafe.com/references/radio-craft/how-audion-invented-january-1947-radio-craft.htm
    How the Audion Was Invented By Lee de Forest In the summer of 1900, I was working under the light of a Welsbach gas burner in my hall bedroom in Chicago, experimenting with my so-called "Sponder," an anti-coherer for the reception of electrical waves for use in wireless telegraphy.

Lee DE Forest.org

    https://www.leedeforest.org/The_Audion.html
    Lee de Forest invented the three-element vacuum tube which became the basis of all electronic devices. He called it the Audion. In the Nineteenth Century Thomas Edison noticed a blackening on the inside of his burning light bulb. He believed it to be caused by electrons and he named it the “Edison Effect.”

The History and Importance of the Vacuum Tube - …

    https://www.thoughtco.com/the-history-of-vacuum-tubes-1992595
    In 1904, John Ambrose Fleming invented the first practical electron tube called the 'Fleming Valve'. Leming invents the vacuum tube diode. In 1906, Lee de Forest invented the Audion later called the triode, an improvement on the 'Fleming Valve' tube. In 1913, William D. Coolidge invented the 'Coolidge Tube', the first practical Xray tube.

The Flame Audion - OneTubeRadio.com

    http://onetuberadio.com/2014/04/19/the-flame-audion/
    The flame is best provided with a mica chimney to protect it from drafts. By keeping plenty of salt in the trough and carefully adjusting the voltage, this detector may be made marvelously sensitive. This type of detector was the inspiration for the Audion tube. The effect was discovered by the Audion’s inventor, Dr. Lee DeForest, in 1903.

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