Russian pulse triode GI-14B (ГИ-14Б) with maximum anode dissipation of 500W. Tubes were made in the former USSR around the 60's. It is ancestor of the more known GI-39B (ГИ-39Б) tube and also offers almost the same performance. Production of the GI-14B tubes started back in the middle of the 50's and was still active until approximately middle of the 70's, at this time it was replaced with newer model GI-39B. New old stock tubes, longer time stored items in original cardboard protection boxes. Datasheet (in russian) included. Tubes are around 60 years old and they do have longer storage marks, like clearly visible patina on the exposed silver covered parts. Years of production may differ. Please see the full gallery for more details.