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Article History

grid, in an electron tube, an electrode that has openings for controlling the flow of electrons or ions through it. Unmodified, the term applies to a control grid that is ordinarily placed between the cathode and the anode (or plate) of an electron tube to vary the flow of current. A screen grid—usually maintained at a fixed potential—is placed between a control grid and an anode to reduce the electrostatic influence of the anode on the control grid. A suppressor grid is interposed between two positive electrodes—usually the screen grid and the anode—to reduce the flow of secondary electrons from one to the other.

This article was most recently revised and updated by William L. Hosch.