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cathode$11937$ - перевод на греческий
![voltage gain]]'' of 3; that is at any instant <math>v_o(t) = 3v_i(t)\,</math>](https://commons.wikimedia.org/wiki/Special:FilePath/Amplification2.svg?width=200 "voltage gain]]'' of 3; that is at any instant <math>v_o(t) = 3v_i(t)\,</math>")
![De Forest's prototype audio amplifier of 1914. The [[Audion]] (triode) vacuum tube had a voltage gain of about 5, providing a total gain of approximately 125 for this three-stage amplifier.](https://commons.wikimedia.org/wiki/Special:FilePath/First Audion amplifier 1914.jpg?width=200 "De Forest's prototype audio amplifier of 1914. The [[Audion]] (triode) vacuum tube had a voltage gain of about 5, providing a total gain of approximately 125 for this three-stage amplifier.")
![op-amp]]](https://commons.wikimedia.org/wiki/Special:FilePath/LM741CN.jpg?width=200 "op-amp]]")
![Power amplifier by [[Skyworks Solutions]] in a [[Smartphone]].](https://commons.wikimedia.org/wiki/Special:FilePath/Sagem VS4 - Skyworks SKY77328-13-9827.jpg?width=200 "Power amplifier by [[Skyworks Solutions]] in a [[Smartphone]].")
![Whirlwind]]](https://commons.wikimedia.org/wiki/Special:FilePath/8863-Project-Whirlwind-CRMI.JPG?width=200 "Whirlwind]]")
![Vacuum tubes seen on end in a recreation of the World War II-era [[Colossus computer]] at [[Bletchley Park]], England](https://commons.wikimedia.org/wiki/Special:FilePath/GB-ENG - Bletchley - Computers - Buckinghamshire - Milton Keynes - Bletchly - Bletchley Park (4890148011).jpg?width=200 "Vacuum tubes seen on end in a recreation of the World War II-era [[Colossus computer]] at [[Bletchley Park]], England")
![Triode tube type GS-9B; designed for use at radio frequencies up to 2000 MHz and rated for 300 watts anode power dissipation.<ref>[https://web.archive.org/web/20210225190032/http://www.gstube.com/data/1450/ GS-9B Oscillator Ultra-High Frequency Triode] Archived 25 Feb. 2021</ref> The finned heat sink provides conduction of heat from anode to air stream.](https://commons.wikimedia.org/wiki/Special:FilePath/GS-9B.JPG?width=200 "Triode tube type GS-9B; designed for use at radio frequencies up to 2000 MHz and rated for 300 watts anode power dissipation.<ref>[https://web.archive.org/web/20210225190032/http://www.gstube.com/data/1450/ GS-9B Oscillator Ultra-High Frequency Triode] Archived 25 Feb. 2021</ref> The finned heat sink provides conduction of heat from anode to air stream.")
![General Electric Company Pliotron, [[Science History Institute]]](https://commons.wikimedia.org/wiki/Special:FilePath/General electric pliotron pp schenectady 3.jpg?width=200 "General Electric Company Pliotron, [[Science History Institute]]")
![The first triode, the de Forest [[Audion]], invented in 1906](https://commons.wikimedia.org/wiki/Special:FilePath/Triode tube 1906.jpg?width=200 "The first triode, the de Forest [[Audion]], invented in 1906")
Википедия
A cold cathode is a cathode that is not electrically heated by a filament. A cathode may be considered "cold" if it emits more electrons than can be supplied by thermionic emission alone. It is used in gas-discharge lamps, such as neon lamps, discharge tubes, and some types of vacuum tube. The other type of cathode is a hot cathode, which is heated by electric current passing through a filament. A cold cathode does not necessarily operate at a low temperature: it is often heated to its operating temperature by other methods, such as the current passing from the cathode into the gas.
