Abstract: An electron gun device, in particular for an X-ray tube, includes a metallic first electrode having a first electrode contact surface; a metallic second electrode having a second electrode contact surface; and a ring-shaped ceramic insulator having a first insulator contact surface on a first side with respect to an axial direction of the insulator and a second insulator contact surface on an opposite second side with respect to the axial direction. In an assembled state, the first insulator contact surface faces the first electrode contact surface and is connected to the first electrode contact surface via a first brazing joint, and the second insulator contact surface faces the second electrode contact surface and is connected to the second electrode contact surface via a second brazing joint.