(1946-1958) First Generation
Vacuum Tube or Thermionic valve is a device that relies on the flow of electric current through a vacuum. It is used for Rectification, Amplification, Switching, or similar processing or creation of electrical signals.
Vacuum Tube are used by the first generation computers ENIAC AND UNIVAC
Thomas Edison added a plate electrode to one of his incandescent bulbs. It was definitely a vacuum tube. Its usefulness was limited to only rectification.
later Dr. Lee DeForest added the grid electrode to Edison's diode, creating a Triode with the ability to amplify small signals and to create self-sustaining oscillation.
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