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Thermionic valve

noun

Definitions

Noun
  1. 1
    An electronic device incorporating electrons from a glowing cathode inside an evacuated glass tube, functioning as a switch, amplifier etc. historical

    "The age of electronics began in 1906 with Lee De Forest's invention of the vacuum tube, or, as the British (led by John Ambrose Fleming, whose work preceded De Forest's) described it, the thermionic valve."

  2. 2
    electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope wordnet

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