Electron tube can be used to describe either of two things: ...
Found on
http://en.wikipedia.org/wiki/Electron_tube
device usually consisting of a sealed glass or metal-ceramic enclosure that is used in electronic circuitry to control a flow of electrons. Among the ... [17 related articles]
Found on
http://www.britannica.com/eb/a-z/e/20
Also known as a valve, an evacuated glass or metal tube which may contain gas at low pressure, through which electrons flow between two or more electrodes. A heated filament, the cathode, emits electrons which are attracted to the positively-charged anode. By varying the voltage on intermediate (gri...
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http://www.daviddarling.info/encyclopedia/E/electron_tube.html
an electronic device that consists, typically, of a sealed glass bulb containing two or more electrodes: used to generate, amplify, and rectify electric oscillations and alternating currents.Cf.
Found on
https://www.infoplease.com/dictionary/electron-tube
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