A Four-Gun Tube for Color Television Receivers

While most NTSC color television receivers built to date have used the three-gun tricolor tube, experimentation with other displays has continued. This paper discusses some aspects of a four-gun four-color tube of the aperture mask type: possibility of minimizing the effect of convergence and other raster deficiencies of the three-gun tube, video circuitry, implications with respect to system amplitude linearity or gamma correction.