Deflection Yoke for 19-Inch 90° Color TV Picture Tubes

At wide deflection angles (90°), it is not possible to optimize all performance characteristics of color TV yokes simultaneously. The color yoke for the new RCA 19-inch, 90° rectangular color picture tube has been designed for optimum convergence and beam-to-phosphor-dot register by analyzing the electromagnetic field flux distribution to obtain the proper astigmatism, coma, and location of deflection centers. A precise "fine tuning" of the flux distribution, without altering the shape of the coils, is obtained by a new method using series-connected strands in parts of the winding. Tight controls on the arbors and winding process and a 100% convergence check, as well as two mechanical adjustments to control the lateral position of the blue beam relative to the red and green, insure a converged color-pure picture equivalent or superior to anything previously on the market.