#thermionic_vacuum_tube__tube__vacuum_tube__thermionic_tube__electron_tube__thermionic_valve  electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
  supertype:  #electronic_device  a device that accomplishes its purpose electronically
  part:  #anode  #cathode  #electrode  #control_grid  #plate.anode
  part of:  #electrical_circuit
  subtype:  #acorn_tube__acorntube  a small vacuum tube; used at high frequencies
  subtype:  #diode__rectifying_tube__rectifying_valve  a thermionic tube having two electrodes; used as a rectifier
  subtype:  #electron_multiplier  a vacuum tube that amplifies a flow of electrons
  subtype:  #gas-discharge_tube__gasdischargetube  a tube in which an electric discharge takes place through a gas
     subtype:  #cathode-ray_tube__cathoderaytube__CRT  a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen
        subtype:  #Crookes_tube  the original gas-discharge cathode-ray tube
        subtype:  #kinescope__picture_tube__picturetube__television_tube  a cathode-ray tube in a television receiver; translates the received signal into a picture on a luminescent screen
           subtype:  #color_tube__colortube__colour_tube__color_television_tube__colour_television_tube__color_TV_tube__colour_TV_tube  a television tube that displays images in full color
              subtype:  #tricolor_television_tube__tricolour_television_tube__tricolor_tube__tricolour_tube__tricolourtube  a color television tube in which three primary colors are combined to give the full range of colors
     subtype:  #glow_lamp__glow_tube  a gas-discharge tube consisting of a cold cathode and a diode in a tube filled with gas; the color of the glow depends on the particular gas
  subtype:  #klystron  an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation
  subtype:  #magnetron  a diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators
  subtype:  #pentode  a thermionic tube having five electrodes
  subtype:  #television-camera_tube__television_pickup_tube  a tube that rapidly scans an optical image and converts it into electronic signals
     subtype:  #iconoscope  the first practical television-camera for picture pickup; invented in 1923 by Vladimir Kosma Zworykin
     subtype:  #image_orthicon__imageorthicon__orthicon  a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons
  subtype:  #tetrode  a thermionic tube having four electrodes
  subtype:  #triode  a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which making amplification possible
  subtype:  #X-ray_tube  a vacuum tube containing a metal target onto which a beam of electrons is directed at high energy for the generation of X rays

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