Vintage EMERSON model 570, 574 and 580 4 tube Superheterodyne  AM radio receiver.  Original old Sams Photofact manual includes schematic, layouts, alignment info, voltage test charts,  repair parts list.  4 pages. Dated 1950.  Emerson Radio and Phonograph Corp., of New York, NY.  This manual would make a sensational accompaniment to your vintage audio equipment.