Vintage Radio Service Manual - MAYFAIR model 510 520 530 510W 520W & 530W 5-tube Superheterodyne AM radio receiver. Manufactured by Radiaphone Corp., of Los Angeles, CA. 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.