Vintage Radio Service Manual - ELECTRONIC LABORATORIES model 710PC & 710PB (Orthosonic) (Chassis No. 2887) 10-tube, Superheterodyne AM radio phonograph record player combination. Manufactured by Electronic Laboratories, Inc., of Indianapolis, IN. Dated 1947. 6 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 phono equipment.