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[[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.]]
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 Mostly the vacuum tube has been replaced by much smaller, more reliable and less expensive solid state technology.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">
Simply put vacuum tubes are arrangements of electrodes in a vacuum
== 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.
* [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]]
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