Vintage Radio Service Manual - PURITAN model 509 portable (battery operated) 6-tube Superheterodyne AM radio receiver. Manufactured by Pure Oil Company, of Chicago, IL. 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.