Rare and massive pulse triode GI-33B (ГИ-33Б) with metal (Cu) - ceramic body. Copper parts (except of the cooler) are silver plated (silver content is more than 33 g). Weight is also remarkable - around 1850 g. Tube is in original polystyrene box, datasheet (in russian language) included. Tubes were produced in the end of the 80's.