Vintage AIR KNIGHT model N5-RD291 combination 5 tube Superheterodyne AM radio receiver with phonograph record player. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test charts, repair parts list and description. 4 pages. Dated 1947. Butler Brothers of Chicago, IL. This manual would make a sensational accompaniment to your classic retro radio / phono equipment.