Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 238-1066 found under Retainer Electron Tube by Viking Technologies Ltd. The National Stock Number assigned to this part is 5960007725943, 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 238-1066.