Vintage Radio Service Manual - MAYFAIR model 550 & 550W 5-tube Superheterodyne AM radio phonograph record player combination. Manufactured by Radiaphone Corp., of Los Angeles, CA. Dated 1947. 4 pages. Original old Sams Photofact manual, schematic, layout, voltage/resistance charts, alignment info and repair parts list.  This manual would make a sensational accompaniment to your retro audio equipment.