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For most purposes, the vacuum tube has been replaced by the much smaller and less expensive transistor, either as a discrete device or in an integrated circuit.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.

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.

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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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.

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