Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 308-1066P4 found under Insert Electron Tub by Raytheon Company. The National Stock Number assigned to this part is 5960006174722, 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 308-1066P4.