Noun
an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube
Source: WordNetAs the voltage applied to the so-called control grid (or simply "grid") was lowered from the cathode's voltage to somewhat more negative voltages, the amount of current from the filament to the plate would be reduced. Source: Internet
The control grid and screen grid are also wound with the same pitch, or number of wires per inch. Source: Internet
In a monochrome receiver the luminance signal is amplified to drive the control grid in the electron gun of the CRT. Source: Internet
Many devices have other electrodes to control operation, e.g., base, gate, control grid. Source: Internet
When held negative with respect to the cathode, the control grid creates an electric field which repels electrons emitted by the cathode, thus reducing or even stopping the current between cathode and anode. Source: Internet