Electron Tube Characteristics and Applications (Twenty-two) - Glossary: Inverse grid current Inverse grid current is caused by the ionization of residual gas in the electron tube; the emission of electrons by the grid due to heating; poor insulation between the grid and other electrodes; the emission of photoelectrons by the grid due to light excitation, etc., which reduces the input resistance of the electron tube, limits the use value of the grid resistance, and causes instability of the electron tube operating point, which is extremely detrimental to the operation of the electron tube.
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