Vintage Radio Service Manual - MOTOROLA model 57X11 & 57X12 (Chassis No. HS-60) 5-tube Superheterodyne AM radio receiver. Manufactured by Motorola, 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.