Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1561-1 found under Coil Telephone by Electronic Transformer Corp. The National Stock Number assigned to this part is 5950006464441, and the Federal Supply Class is 5950 Coils And Transformers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1561-1.