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 Mostly the vacuum tube has been replaced by much smaller, more reliable and less expensive solid state technology.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