Vintage Radio Service Manual - SONORA model WKRU-254A 8-tube Superheterodyne AM FM radio receiver with combination phonograph record changer. Manufactured by Sonora Radio & Television Corp., of Chicago, IL. Dated 1948. 8 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 phono equipment.