Quality vintage soviet ceramic tube sockets PL7-1KD-45 (ПЛ7-1КД-45) for miniature 7-pin tubes. Sockets are equipped with removable steel retainer. It is suitable for tubes like 6F31, 6Z31, 6Z4 (China), 6C4P-EV (6Ц4П-ЕВ), 6J4P (6Ж4П), 6K4P-EV (6К4П-ЕВ) and other tubes with similar height. After very easy removal of the retainer they may be used for all heptal tube types. New old stock.