Definitions for vacuum tube
This page provides all possible meanings and translations of the word vacuum tube
Random House Webster's College Dictionary
an electron tube from which almost all air or gas has been evacuated.
tube, vacuum tube, thermionic vacuum tube, thermionic tube, electron tube, thermionic valve(noun)
electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
An electrical device containing a heated filament inside an evacuated container (generally a glass tube) and used to produce rectification (a diode vacuum tube), amplification or other functions.
In electronics, a vacuum tube, electron tube, thermionic valve, tube, or valve is a device controlling electric current through a vacuum in a sealed container. The container is often thin transparent glass in a roughly cylindrical shape. The simplest vacuum tube, the diode, is essentially an incandescent light bulb with an added electrode inside. When the bulb's filament is heated white-hot, electrons are "boiled" off its surface and into the vacuum inside the bulb. If the electrode -- called a "plate" or "anode" -- is made more positive than the hot filament, a direct current flows through the vacuum to the electrode. As the current only flows in one direction, it makes it possible to convert an alternating current applied to the filament to direct current. The introduction of a third electrode, a grid between the filament and the plate, yields another function. A voltage applied to the grid controls the current flowing from the filament to the plate. Thus, it allows the device to be used as an electronic amplifier. Vacuum tubes are thus used for rectification, amplification, switching, or similar processing or creation of electrical signals.
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