#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 of:  electrical_circuit
  part:  anode  a positively charged electrode by which electrons leave an electrical device
  part:  cathode  a negatively charged electrode that is the source of electrons in an electrical device
  part:  electrode  a conductor used to make electrical contact with some part of a circuit
  part:  control_grid__controlgrid__grid  an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube
  part:  plate.anode  the positively charged electrode in a vacuum tube

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