Vintage AIR CHIEF model 4-A-25 (Code No. 291-6-572) 5 tube Superheterodyne AM radio receiver. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test chart, 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 radio equipment.