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Screen grid
A second grid element interposed between the control grid and the plate, to act as an electrostatic shield between them. This shielding action greatly reduces the input capacitance of the tube, which increases it's frequency response, and makes the plate current virtually independent of plate voltage. There is no screen grid in a triode, only in a tetrode or pentode.
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- Part of Speech: noun
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- Category: Amplifier
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