Apparatus for adjusting operating conditions of a cathode ray tube

DETAILED DESCRIPTION An object of the present invention is to enhance operating condition adjustments of a cathode ray tube in a color television receiver.
Another object of the invention is to provide apparatus for improving operating adjustments of cathode ray tube cut-off and color temperature conditions.
Still another object of the invention is to provide improved isolation of increased values of potential applied to the base pins of a cathode ray tube.
A further object of the invention is to provide apparatus for cut-off and color temperature adjustments of a cathode ray tube with a minimum of interaction between the cut-off and color temperature adjustment controls.
These and other and further objects, advantages and capabilities are achieved in one aspect of the invention by operating condition adjustment apparatus for the cathode ray tube of a color television receiver wherein a matrixing and amplifying circuit is coupled to the cathodes of a cathode ray tube, to bias potential development and bias potential adjustment circuits, to a chrominance signal source and selectively by a "service-normal" switch and adjustable drive controls to luminance or reference signal sources.
In the "normal" position the drive controls adjust the color temperature and in the "service" position the bias adjustment selects the proper cut-off bias potentials for the cathode ray tube.