Automatic kinescope bias control system compensated for kinescope electron gun conduction dissimilarities

Abstract From the Canadian patent

A color television receiver includes plural automatic kinescope bias (AKB) control systems respectively associated with plural electron guns of a kinescope which may exhibit mutually dissimilar electron gun conduction characteristics. Each AKB system includes means for deriving a signal representative of the electron gun black current magnitude, a source of auxiliary signal with a magnitude proportional to the bias of the associated electron gun during image blanking intervals and a control network for providing a bias control signal to the associated electron gun to maintain a correct black current level. In order to maintain the correct black current levels of the electron guns in …