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[[File:cgs photo 6me8.jpg|thumb|left|250px|A 6ME8 beam-deflection tube.]]
[[File:cgs photo 6me8.jpg|thumb|left|250px|A 6ME8 beam-deflection tube.]]
[[File:cgs_photo_ts1.jpg|thumb|right|300px|A vacuum tube synth.]]
[[File:cgs_photo_ts1.jpg|thumb|right|300px|A vacuum tube synth.]]
In electronics the '''vacuum tube''' or '''thermionic) valve''' (outside the USA) is a device generally used to amplify, modify or control a signal. Mostly the vacuum tube has been replaced by much smaller, more reliable and less expensive solid state technology. Tubes are still used in several specialized applications such as audio systems and high power RF transmitters.<ref name "vtbet">[https://www.eduinblog.com/vacuum-tube-basic-electronics-tutorial/ Vacuum tube – Basic electronics tutorial]</ref>
In electronics the '''vacuum tube''' or '''thermionic valve''' (outside the USA) is a device generally used to amplify, modify or control a signal. Mostly the vacuum tube has been replaced by much smaller, more reliable and less expensive solid state technology. Tubes are still used in several specialized applications such as audio systems and high power RF transmitters.<ref name ="vtbet">{{Cite web |url=https://www.eduinblog.com/vacuum-tube-basic-electronics-tutorial/ |title=Vacuum tube – Basic electronics tutorial |accessdate=2019-06-07 |archiveurl=https://web.archive.org/web/20190607152629/https://www.eduinblog.com/vacuum-tube-basic-electronics-tutorial/ |archivedate=2019-06-07 |url-status=dead }}</ref>


Simply put vacuum tubes are arrangements of electrodes in a vacuum within an insulating, temperature-resistant envelope, (most often of glass). Except for some special-purpose tubes which use a gas in the envelope. The electrodes are attached to leads which pass through the envelope via an air tight seal which are designed to plug into a tube socket for easy replacement. A filament (the cathode) is heated so that it releases electrons into the vacuum (thermionic emission). These are drawn to a metal plate (the anode) inside the envelope. Another electrode (the grid) is placed between the filament and plate. A [[voltage]] applied to the grid will control the plate plate [[current]].<ref name "vtbet"/>
Simply put vacuum tubes are arrangements of electrodes in a vacuum, (except for some special-purpose tubes which use a gas in the envelope) within an insulating, temperature-resistant envelope, (most often of glass). The electrodes are attached to leads which pass through the envelope via an air tight seal which are designed to plug into a tube socket for easy replacement. A filament (the cathode) is heated so that it releases electrons into the vacuum (thermionic emission). These are drawn to a metal plate (the anode) inside the envelope. Another electrode (the grid) is placed between the filament and plate. A [[voltage]] applied to the grid will control the plate plate [[current]].<ref name ="vtbet"/>


== See also ==
== See also ==
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* ''[https://spectrum.ieee.org/consumer-electronics/audiovideo/the-cool-sound-of-tubes The Cool Sound of Tubes]'' by Eric Barbour, IEEE Spectrum, August 1998.
* ''[https://spectrum.ieee.org/consumer-electronics/audiovideo/the-cool-sound-of-tubes The Cool Sound of Tubes]'' by Eric Barbour, IEEE Spectrum, August 1998.
* [http://www.tubebooks.org/ Tubebooks.org]
* [http://www.tubebooks.org/ Tubebooks.org]
* [http://www.geofex.com/tubeampfaq/taffram.htm Musical Instrument Tube Amp Building, Maintaining and Modifying FAQ]
* [https://web.archive.org/web/20090513025236/http://www.jacmusic.com/html/articles/ericbarbour/howavacuumtubeworks.html How a vacuum tube works] by Eric Barbour


[[Category:Vacuum tubes]]
[[Category:Vacuum tubes]]

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Latest revision as of 19:06, 19 December 2022

A 6ME8 beam-deflection tube.
A vacuum tube synth.

In electronics the vacuum tube or thermionic valve (outside the USA) is a device generally used to amplify, modify or control a signal. Mostly the vacuum tube has been replaced by much smaller, more reliable and less expensive solid state technology. Tubes are still used in several specialized applications such as audio systems and high power RF transmitters.[1]

Simply put vacuum tubes are arrangements of electrodes in a vacuum, (except for some special-purpose tubes which use a gas in the envelope) within an insulating, temperature-resistant envelope, (most often of glass). The electrodes are attached to leads which pass through the envelope via an air tight seal which are designed to plug into a tube socket for easy replacement. A filament (the cathode) is heated so that it releases electrons into the vacuum (thermionic emission). These are drawn to a metal plate (the anode) inside the envelope. Another electrode (the grid) is placed between the filament and plate. A voltage applied to the grid will control the plate plate current.[1]

See also

References

  1. ^ a b "Vacuum tube – Basic electronics tutorial". Archived from the original on 2019-06-07. Retrieved 2019-06-07.

External links

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