Vintage Radio Service Manual - CLARION model 1231OW 6-tube. Superheterodyne AM SW radio receiver with record changer phonograph combination. Manufactured by Warwick Manufacturing Corp., of Chicago, IL. Dated 1948. 4pgs. 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 phono equipment.