Quality vintage soviet ceramic tube sockets PLK9-D40 (ПЛК9-Д40) for miniature 9-pin tubes. Sockets are equipped with removable steel retainer. It is suitable for tubes like 6N1P (6H1П), 6N2P (6H2П), 6N3P (6H3П), 6N23P (6H23П), E88CC/6922, E83CC/12AX7, ECC82/12AU7 and many others. After very easy removal of the retainer they may be used for all noval tube types. New old stock.