Vintage Radio Service Manual - DELCO model R-1238  5-tube Superheterodyne AM radio receiver.  Manufactured by United Motors Service, div of G.M.C., of Detroit MI. Dated 1948. 4 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 audio equipment.