Vintage Radio Service Manual - MOTOROLA model 47B11 (Chassi No. HS-72) 4-tube battery operated 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.