A 19-inch, 114-degree, line-operated all-transistor TV receiver

The design of an all-transistor, line-operated, black-and-white television receiver was undertaken to determine the major device problem areas. The design was based on the stringent 114-degree deflection requirements as applied to the large-volume 19-inch and 23-inch receivers. Transistor television will not become a large-volume reality until the price, as well as the performance, is comparable with that of existing tube-type receivers. Consequently, efforts were directed to the development of potentially low-cost devices and circuits without appreciable compromise in performance. This paper describes (1) the design of the receiver, (2) some new transistor types which were developed for specific difficult functions, and (3) the receiver performance. Emphasis is on line operation only. The major technical problem areas encountered in the receiver were in the deflection, video, and rf stages. The final receiver contains 23 transistors, 14 diodes, and a high-voltage rectifier. Prior to and during the design of the television receiver, two new families of transistors were developed for specific functions in the receiver. These devices, which are still in the developmental stage, are identified by TA numbers in the paper. The first of these families, a germanium dot-diffused mesa rf transistor having low feedback capacitance, is used in the tuner and in the picture and sound if-amplifier stages. The second, a high-voltage diffused-collector graded-base power transistor, is used in the horizontal-driver and output, the vertical-output, and the audio-output stages.