Abstract: By deflecting the electron beams before the focusing lenses in an electron gun system for a color display tube towards the tube axis by non-symmetrical lens fields so that they converge on the display screen, it has proved possible to obtain symmetrical focusing lens fields by means of mechanically non-symmetrical electrodes the axes of which are parallel, if the beams enclose a given angle with the gun axes. This enables an easy manufacture of the electrodes and an accurate assembly of the guns. In these guns the focusing of the beams is independent of the convergence.