A Beam-Indexing Color Picture Tube-The Apple Tube

This paper describes the Apple color picture tube, its dimensions, materials of construction, deflection and focus systems, and the geometry and deposition of the phosphor and secondary-emissive screen materials. The construction and operation of the electron gun, which produces two independent beams of very small cross section from a single cathode, are described in detail. Life test data and pilot production experience are discussed.