Vintage Radio Service Manual - ELECTRONIC LABS model 3000 Orthosonic 4-tube TRF radio receiver. Manufactured by  Electronic Laboratories, Inc., of Indianapolis, IN. Dated 1948. 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.