Vintage Radio Service Manual - HALLICARAFTERS model CA-4 7-tube aircraft crystal controlled radio transmitter and Superheterodyne receiver. Manufactured by Hallicrafters Company, of Chicago, IL. 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.  This manual would make a sensational accompaniment to your retro radio equipment.