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control grid

   Also found in: Medical, Encyclopedia, Wikipedia 0.01 sec.
control grid
n
(Electronics) Electronics another name for grid [6] in a tetrode, pentode and similar devices
control grid
An electrode used in triodes, tetrodes, and pentodes, placed between the cathode and the plate (usually very close to the cathode). Electrons emitted by the cathode must pass through the control grid to reach the positively charged plate and create current flow through the tube, but a negative voltage on the intervening control grid impedes that flow; the more negative the control grid, the smaller the flow. Small variations in the voltage of the grid thus have a great effect on the current flow.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.control grid - an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube
grid
electrode - a conductor used to make electrical contact with some part of a circuit
electron tube, thermionic tube, thermionic vacuum tube, thermionic valve, vacuum tube, tube - electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
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