Invention of Electron Tube Diode

Electrical engineer, John Ambrose Fleming invented the electron tube diode in 1904 at University College in London, England. The electron tube diode was a sealed glass tube containing a heated metal cathode and an unheated anode. It was able to regulate the direction of current passing through it depending on the polarity of an external voltage applied to the anode. Fleming was the first to use the diode for radiotelephony, an electronic rectifier for converting alternating-current radio signals into direct-current signals detectable by a telephurceiver as observed by Thomas Edison in 1883. The electron diode is also known by: vacuum diode, kenotron, thermionic tube, Fleming valve, and thermionic valve.

      1904, 1883
      John Ambrose Fleming
      electrical engineer
      London, England

Additional Information:

  • Vacuum tube – Wikipedia
    The simplest vacuum tube, the diode invented in 1904 by John Ambrose Fleming, contains only a heated electron-emitting cathode and an anode. Electrons can only flow in one direction through the device—from the cathode to the anode.
    ‎John Ambrose Fleming · ‎Tube sound · ‎Battery (vacuum tube) · ‎Thermionic emission
  • Fleming valve – Wikipedia
    The Fleming valve, also called the Fleming oscillation valve, was a thermionic valve or vacuum tube invented in 1904 by Englishman John Ambrose Fleming as a detector for early radio receivers used in electromagnetic wireless telegraphy. It was the first practical vacuum tube and the first thermionic diode, a vacuum … As a result of his work on the incandescent light bulb, Thomas …
  • The First Vacuum Tube – History of the Thermionic Tube
    This invention (see the nearby photo for one of the first vacuum diodes of … The Fleming’s vacuum tube was based on an effect that Thomas Edison had first …
  • The History and Importance of the Vacuum Tube – ThoughtCo
    Feb 4, 2019 – In 1904, John Ambrose Fleming invented the first practical electron tube called the ‘Fleming Valve’. Leming invents the vacuum tube diode.
  • Fleming Valve – Spark Museum
    The Fleming Oscillation Valve was the first practical application of the Edison Effect (The emission of electrons by a heated element) used as a vacuum tube …

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