What does thermionic tube mean?

Definitions for thermionic tube
thermion·ic tube

This dictionary definitions page includes all the possible meanings, example usage and translations of the word thermionic tube.

Princeton's WordNet

  1. tube, vacuum tube, thermionic vacuum tube, thermionic tube, electron tube, thermionic valvenoun

    electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

Wikipedia

  1. thermionic tube

    A vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a hot cathode for fundamental electronic functions such as signal amplification and current rectification. Non-thermionic types such as a vacuum phototube, however, achieve electron emission through the photoelectric effect, and are used for such purposes as the detection of light intensities. In both types, the electrons are accelerated from the cathode to the anode by the electric field in the tube. The simplest vacuum tube, the diode (i.e. Fleming valve), invented in 1904 by John Ambrose Fleming, contains only a heated electron-emitting cathode and an anode. Electrons can only flow in one direction through the device—from the cathode to 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 grids.These devices became a key component of electronic circuits for the first half of the twentieth century. They were crucial to the development of radio, television, radar, sound recording and reproduction, long-distance telephone networks, and analog and early digital computers. Although some applications had used earlier technologies such as the spark gap transmitter for radio or mechanical computers for computing, it was the invention of the thermionic vacuum tube that made these technologies widespread and practical, and created the discipline of electronics.In the 1940s, the invention of semiconductor devices made it possible to produce solid-state devices, which are smaller, more efficient, reliable, durable, safer, and more economical than thermionic tubes. Beginning in the mid-1960s, thermionic tubes were being replaced by the transistor. However, the cathode-ray tube (CRT) remained the basis for television monitors and oscilloscopes until the early 21st century. Thermionic tubes are still used in some applications, such as the magnetron used in microwave ovens, certain high-frequency amplifiers, amplifiers for electric musical instruments such as guitars, as well as high end audio amplifiers, which many audio enthusiasts prefer for their "warmer" tube sound. Not all electronic circuit valves / electron tubes are vacuum tubes. Gas-filled tubes are similar devices, but containing a gas, typically at low pressure, which exploit phenomena related to electric discharge in gases, usually without a heater.

ChatGPT

  1. thermionic tube

    A thermionic tube, also known as a vacuum tube, is an electronic device that controls the flow of electric current through a vacuum in a sealed container. The primary components include a heated filament, a cathode, an anode, and one or more control grids. These tubes are often used in amplifiers, oscillators, and switching systems as they allow the manipulation of the electrical signals passing through them.

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Numerology

  1. Chaldean Numerology

    The numerical value of thermionic tube in Chaldean Numerology is: 9

  2. Pythagorean Numerology

    The numerical value of thermionic tube in Pythagorean Numerology is: 9

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"thermionic tube." Definitions.net. STANDS4 LLC, 2024. Web. 19 Jul 2024. <https://www.definitions.net/definition/thermionic+tube>.

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