Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 401-00 ISSUE 6 found under Amplifier Audio Frequency by Charles Industries Ltd. The National Stock Number assigned to this part is 5996001467954, 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 401-00 ISSUE 6.