Big pulse modulator tetrode GMI-2B (ГМИ-2Б) with massive copper anode. Maximum anode dissipation: 900W. Maximum anode voltage: 32kV. Nett weight of the tube is approximately 4,5 kg. New in box tubes and in perfect condition (please look at the gallery pictures). A very nice piece to your collection, or for your DIY project. Year of production: 1988.