Nice and massive soviet ceramic sockets PLK-50MD (ПЛК-50МД) with construction made of special aluminium alloy (used in engine constructions). Sockets are suitable for tubes like GU-50 (ГУ-50), 5C9S (5Ц9С), GU-15 (ГУ-15) and others. New old stock sockets in very nice condition (with some small scratches or abrasions at some places of the siluminium construction). Generally very nice and original vintage tube sockets (please look at the gallery pictures for more details). Year of production: 1971.