Vintage Radio Service Manual - WATTERSON model 4782 4-tube Superheterodyne AM radio receiver. Manufactured by Watterson Radio Manufacturing Corp., of Dallas, TX. Dated 1947. 4 pages. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test chart, repair parts list and description. This manual would make a sensational accompaniment to your retro audio equipment.