Vintage Radio Service Manual - AIRADIO model 3100 8-tube FM radio receiver. Manufactured by Airadio, Inc., of Stamford, CT. Dated 1948. 6 pages. Original old Sams Photofact manual includes schematic, layout, alignment instructions, dial cord drive, voltage & resistance test chart, repair parts list and description. Foldout has crease. This manual would make a sensational accompaniment to your retro audio equipment.