Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 575R490H01 found under Electron Tube by Raytheon Technical Services Company. The National Stock Number assigned to this part is 5960001952420, 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 575R490H01.