FIELD: electronic engineering. SUBSTANCE: electron gun has many cathode assemblies mounted on at least two electrically isolated supporting rods. At least one of electrodes has actually rectangular cup-shaped deep-implantation element provided with base area with many fixing lugs and side wall extending between base area and supporting flange. Side wall has, essentially, stiffening part on each opposite side projecting outside at acute angle of about 45 deg. from side wall. EFFECT: improved design. 5 dwg
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