Soviet pulse triode GI-15B (ГИ-15Б) with maximum anode dissipation of 80W. Outer parts of the tube are silver plated (approximately 3g of silver was used for each tube). GI-150 is the same tube, but without the heat sink (for another type of cooling). New old stock tubes, longer time stored items in original polystyrene protection boxes. Made in the late 80's and early 90's (please look at the gallery pictures).