Vintage Radio Service Manual - MOTOROLA model 408  6-tube Superheterodyne AM radio receiver.  Manufactured by Motorola, Inc., of Chicago, IL.  Dated 1948.  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.