Vintage Radio Service Manual - ZENITH model 7R070 (Chassis No. 6C06) 7-tube Superheterodyne AM radio receiver combination phonograph record changer. Manufactured by Zenith Radio Corp., of Chicago, IL. Dated 1948. 6 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 phono equipment.