screen grid

noun Electronics.

1. a grid placed between the anode and the control electrode in a vacuum tube, usually maintained at a fixed positive potential.

noun

1. electronics 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 deviceSometimes shortened to: screen See also suppressor grid