Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number QKH1978 2J70B found under Electron Tube by Raytheon Technical Services Company. The National Stock Number assigned to this part is 5960010659684, 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 QKH1978 2J70B.