Vintage Radio Service Manual - DEWALD model A-509 5-tube Superheterodyne AM SW radio receiver. Manufactured by Dewald Radio Manufacturing Company, of New York, NY.Dated 1948. 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.