Vintage AIR CHIEF model 4-B-2 6 tube Superheterodyne AM car radio receiver. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test charts, repair parts list and description. 4 pages. Dated 1947. Firestone Tire and Rubber Company of Akron, OH. This manual would make a sensational accompaniment to your classic retro radio equipment.