Abstract: A color display tube comprising an evacuated envelope (1) composed of a neck (4), a cone (3) and a display window (2), contains in the neck a system of electron guns (5) with which three electron beams are generated. The beams are situated with their axes in one plane and are focused by means of a focusing lens field on a display screen (10) provided on the inside of the display window. The focusing lens field is formed between two electrodes (25, 26) of the electron gun system which are situated behind each other along the axes. The electrodes comprise facing outermost rims (32, 33) and includes respective apertures (38, 39, 40), (42, 43, 44) which are symmetrical with respect to the plane and through which the electron beams pass within the rims. The apertures are formed in recessed parts (34, 41) extending substantially at right angles to the axes.