Vintage Radio Service Manual - EMERSON model 558 (Chassis No. 120058) 4-tube portable (battery operated) Superheterodyne AM radio receiver. Manufactured by Emerson Radio and Phonograph Corp., of New York, NY. Dated 1048. 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.