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WordReference Random House Unabridged Dictionary of American English © 2024screen′ grid′, [Electronics.]- Electronicsa grid placed between the anode and the control electrode in a vacuum tube, usually maintained at a fixed positive potential.
Collins Concise English Dictionary © HarperCollins Publishers:: screen grid n - an electrode placed between the control grid and anode of a valve and having a fixed positive potential relative to the grid. It acts as an electrostatic shield preventing capacitive coupling between grid and anode, thus increasing the stability of the device
Sometimes shortened to: screen
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