Vintage Radio Service Manual - SONORA model RGMF-212 & RGMF-230 5-tube Superheterodyne AM radio receiver with phonograph record player combination. Manufactured by Sonora Radio & Television 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 phono equipment.