Old and quality metal-ceramic tube sockets PLK9-E55 (ПЛК9-Э55) for miniture 9-pin based tubes of general height approximately 55 mm (measured from the bottom of the pins to the tip of the glass envelope). Sockets are equipped with aluminium shield with spring inside. Designed for tubes like 6N23P (6H23П)/ E88CC/6922/, E83CC/12AX7, ECC85, ECC82, ECC81, 6N1P (6H1П), 6N2P (6H2П), 6N3P (6H3П), 6S3P-EV (6C3П-EB), 6S4P-EV (6C3П-EB)) and many others. New old stock, made in the 70's and 80's.