Abstract: A novel electron gun for use in television cathode ray tubes of the direct view or projection type is disclosed. The cathode ray tube has associated therewith a power supply for developing a predetermined pattern of operating voltages including first and second adjustable voltages. The electron gun has apertured electrodes aligned on an axis for receiving the operating voltages to produce a focused beam of electrons. The electron gun comprises lower end means for generating an electron beam having a crossover. The beam expands in the aperture of a prefocusing electrode following the crossover and the outer rays of the expanding beam define a half-angle with respect to the axis. The tube also comprises main focus lens means adjacent to the prefocusing electrode for receiving the expanding beam and focusing the beam to form a beam spot of minimum size at a predetermined distance from the gun.