Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WS9499 found under Electron Tube by Navair And Navsea Managed. The National Stock Number assigned to this part is 5960004256246, 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 WS9499.