Alternatively referred to as an electron tube or valve and first developed by John Ambrose Fleming in 1904. The vacuum tube is a glass tube that has its gas removed which creates a vacuum. Vacuum tubes contain electrodes for controlling electron flow in early computers that used them as a switch or an amplifier. The picture shows a collection of different vacuum tubes to give you a better understanding.
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| source: vacuumtube.net |
Today, vacuum tubes are no longer used with computers and have been replaced by the transistor.
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