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04-Dec-2014 05:10

Current can only flow in one direction through the device between the two electrodes, as electrons emitted by the cathode travel through the tube and are collected by the anode.Adding one or more control grids within the tube allows the current between the cathode and anode to be controlled by the voltage on the grid or grids.Not all electronic circuit valves/electron tubes are vacuum tubes (evacuated); gas-filled tubes are similar devices containing a gas, typically at low pressure, which exploit phenomena related to electric discharge in gases, usually without a heater.The simplest vacuum tube, the diode, contains only a heater, a heated electron-emitting cathode (the filament itself acts as the cathode in some diodes), and a plate (anode).

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This type is called a thermionic tube or thermionic valve.

A phototube, however, achieves electron emission through the photoelectric effect.



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