Vintage Radio Service Manual - SETCHELL-CARLSON model 447 5-tube (Batter-Line Operated) Superheterodyne AM radio receiver. Manufactured by Setchell Carlson Company, of St Paul, MN. Dated 1948. 4 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 audio equipment.