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Definition: suppressor grid

A grid used in pentode vacuum tubes that suppresses interference or secondary electron flow caused by electrons that bounce off or are reflected by the plate. The suppressor grid sits between the screen grid and plate (anode). By applying a voltage to the suppressor grid at or near the cathode potential, spurious current flow is contained between the plate and suppressor grid, and leakage to other elements in the tube is limited. See pentode.