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The electrodes are attached to leads which pass through the envelope via an air tight seal.On most tubes, the leads are designed to plug into a tube socket for easy replacement.The result is a current of electrons flowing from filament to plate.This cannot work in the reverse direction because the plate is not heated and cannot emit electrons.

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S.) and high power RF transmitters, as a display device in television sets and in microwave ovens. For most purposes, the vacuum tube has been replaced by the much smaller and less expensive transistor, either as a discrete device or in an integrated circuit. and Canadian English) or (thermionic) valve (outside North America) is a device generally used to amplify, or otherwise modify, a signal by controlling the movement of electrons in an evacuated space.The simplest vacuum tubes resemble incandescent light bulbs in that they have a filament sealed in a glass envelope which has been evacuated of all air.

When hot, the filament releases electrons into the vacuum: a process called thermionic emission.

In it's simplest form a vacuum tube can be created to operate as a diode: a device that conducts current only in one direction.

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