Vintage Radio Service Manual - ZENITH model 5G036 (Chassis No. 5C-51) 5-tube Superheterodyne AM radio receiver.  Manufactured by Zenith Radio Corp., 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.