Tube socket PLK9-D31 (ПЛК9-Д31) is 9-pin metal-ceramic tube socket with holder (H=31 mm), so it is suitable for the smallest 9-pin based tbes with general height of ~ 36 mm. Please look at the drawing in the gallery. Retainer is easily removable, so after its removal it maz be used for the miniature 9-pin tubes with other heights too. Number of contacts: 9. Insulator material: ceramic. Contacts plating: silver.