Vintage Radio Service Manual - AIR CHIEF model 4-A-60  9-tube Superheterodyne AM FM radio receiver. combination phonograph record changer. Manufactured by Firestone Tire & Rubber Company, of Akron, OH. Dated 1946. 12 pages. Original old Sams Photofact manual includes schematic, layout, alignment instructions, dial cord drive, voltage & resistance test chart, repair parts list and description. This manual would make a sensational accompaniment to your retro phono equipment.