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Vintage soviet tube 6D10D (6Д10Д) is indirectly heated diode, which was used as a frequency multiplier in UHF band. Height: not more than 4 cm. Width: 2 cm (+/- 0,2 cm). Weight: around 10 g. New old stock tubes, directly from the factory packing. Year of production: 1977 (please look at the gallery pictures).