Vintage Radio Service Manual - AIRLINE model 74WG-1057A AC-DC portable (battery operated) 4-tube Superheterodyne AM radio receiver. Manufactured by Montgomery Ward & Company of Chicago, IL. 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.