A set of metal electrodes and intervening metal grids, contained in a glass or metal tube from which all gas has been removed. Voltages on the grids control electrical currents between the electrodes. Formerly used for amplification and switching in electronic circuits, vacuum tubes are now used in applications such as cathode-ray tubes and those requiring very high power levels. A vacuum tube is known as a valve in Great Britain.
Zastarela tehnologija koja je korišćena na prvim računarima. Ovaj uređaj prenosi podatke tako što kontroliše protok elektrona, kao što to rade poluprovodničke diode i tranzistori u modernim računarima.