Abstract: A high speed electromagnetic deflected electrostatic focus cathode ray tube display having a relatively short magnetic time constant by controlling the gun structure. The volume resistivity and the thickness of resistive materials used in the neck of the cathode ray tube that are cut by changing magnetic flux fields, are selected to provide a relatively short time constant. In one arrangement, the tube focusing control elements near the deflection yoke are formed on a precision ground structure of glass or other suitable ceramic materials. In another arrangement the elements of the tube that are intercepted by the changing magnetic flux are deposited or formed on a precision ground portion of the tube neck. Material deposited on the tube structure or on the tube neck is of a selected maximum volume resistivity and a selected small thickness so that the overall operation has a relatively short time constant.