Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S290MR078P005 found under Electron Tube by Raytheon Service Co Logistics Su. The National Stock Number assigned to this part is 5960010292767, 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 S290MR078P005.