Vintage Radio Service Manual - AUTOMATIC model ATTP Tom Thumb. AC or Battery Operated 4-tube Superheterdyne AM radio receiver. 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.