write short notes on vacuum tube
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An electronic device that controls the flow of electrons in a vacuum. It is used as a switch, amplifier or display screen (CRT). Used as on/off switches, vacuum tubes allowed the first computers to perform digital computations.
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Vacuum Tube was developed by John Fleming in the year 1904.Vacuum tube is not more than a glass tube with vacuum in it. With the help of electrodes they control the flow of electrons.They were used in early computers . After the invention of transistor vacuum tubes became obsolete .
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