Electron tube GS-9B (ГС-9Б) is a coaxial microwave triode with maximum anode dissipation of 300W. Tubes are physically identical with the GI-7B tube, but several parameters are different. This triode is normally available in two variants of cooling: with a heat sink, suitable for forced air cooling (GS-9B) and without a heat sink, for other types of cooling (GS-90B). Metal parts of the tube are silver plated. New in box tubes, directly from the factory packing. All available tubes were made in the 80's.