Vintage Phono Service Manual - DYNAVOX model Swingmaster 2-tube phonograph record player. Manufactured by Dynavox Corp., of Long Island City, NY. Dated 1947. 2 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.