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bias a voltage applied to an electronic device, such as a transistor or a vacuum tube, to establish a reference level of operation. [1/8 definitions]
cathode ray a stream of electrons emitted by a cathode in a vacuum tube.
cathode-ray tube a vacuum tube in which a stream of electrons is accelerated and focused in a beam that produces lighted traces on a screen at one end of the tube, used in television sets, computer monitors, and the like.
CRT abbreviation of "cathode-ray tube," a vacuum tube in which a stream of electrons is accelerated and focused in a beam that produces lighted traces on a screen at one end of the tube, used in television sets, computer monitors, and the like.
grid current the flow of electrons from the grid to the cathode of a vacuum tube.
magnetron a vacuum tube that produces microwaves by the action of an external magnetic field on electrons in the tube.
pentode a vacuum tube containing five electrodes that is used as a voltage amplifier.
rectifier an electrical device, such as a vacuum tube, that converts alternating current to direct current. [1/2 definitions]
thermionic tube a vacuum tube in which an electrically heated cathode causes the emission of electrons or ions.
transistor a compact electronic device that uses semiconductors to regulate current flow and thus requires much less energy for operation than a vacuum tube. [1/2 definitions]
triode a vacuum tube that contains an anode, cathode, and control grid.