Vintage Radio Service Manual - AIRCASTLE model 5025 portable (battery operated) 4-tube AM radio receiver. Manufactured by Spiegel Inc, of Chicago, IL. Dated 1947. 4 pages. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test chart, repair parts list and description. This manual would make a sensational accompaniment to your retro audio equipment.