Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KS9 20D found under Electron Tube by British Sarozal Ltd. The National Stock Number assigned to this part is 5960001362505, and the Federal Supply Class is 5960 Electron Tubes And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like KS9 20D.