Vintage Radio Service Manual - AUTOMATIC model Tom Thumb Jr 5-tube battery operated, portable Superheterodyne AM radio. Manufactured by Automatic Radio Manufacturing Company of Boston, MA. Dated 1947. 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.