Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S81-6989 found under Lampholder by Ampex Data Systems Corporation. The National Stock Number assigned to this part is 6250002839741, and the Federal Supply Class is 6250 Ballasts Lampholders And Starters. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S81-6989.