Vintage Radio Service Manual - DYNAVOX model 3-P-801 portable (battery-line operated) 4-tube Superheterodyne AM radio receiver. Manufactured by Dynavox Corp., of Long Island City, NY. 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.