#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
  subtype:  #acorn_tube  #diode  #electron_multiplier  #gas-discharge_tube  #klystron  #magnetron  #pentode  #television-camera_tube  #tetrode  #triode  #X-ray_tube
  part:  #anode  #cathode  #electrode  #control_grid  #plate.anode
  part of:  #electrical_circuit__circuit__electric_circuit  an electrical device that provides a path for electrical current to flow
     part of:  #electronic_equipment  equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor)

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