GMI-90 (ГМИ-90) is a massive beam-power tetrode, which was used in pulse modulators in stationary RF equipment. Maximum anode dissipation: 140W. Maximum anode voltage: 33kV. New in box tubes, directly from the old reserves and generally in very nice condition. All of the available pieces were made in years 1985 and 1986 (sample is in the gallery).