Electron gun display device provided with an electron gun

This invention relates to an electron gun comprising a section for generating at least one electron beam and a main lens system which, viewed in the propagation direction of the electron beam, has a first electrode, a final electrode and at least one intermediate electrode, each having at least one aperture allowing the electron beam to pass and being separated from each other by a gap with a chosen field strength, at least one of the gaps having the highest field strength, a main lens voltage being applied step-wise across said electrodes during operation so as to form an electron-optical focusing lens. The stray emission in an electron gun comprising a main lens system with one or more intermediate electrodes () between the focus electrode () and the anode electrode () is reduced if at least one of the apertures of the main lens system following the focus electrode has apertures which are smaller than those of the focus electrode. The optimal stray emission situation can be found by designing all the apertures of the main lens system. In order to manufacture an electron gun according to the invention, it is advantageous to have an outside reference system for gun mounting, because it will no longer be possible to center the electrodes on pins through the apertures.