Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 57-1440-00 found under Amplifier Subassemb by Gould Instrument Systems Inc. The National Stock Number assigned to this part is 5996012985431, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 57-1440-00.