Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HA3564 found under Electron Tube by Dowty Industrial Corp. The National Stock Number assigned to this part is 5960001883967, 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 HA3564.