Vintage PURITAN models 506 and 507 (Chassis 6D15SW and 6D25SW) Superheterodyne 6 tube AM radio receiver. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test charts, repair parts list and description. Dated 1946. 4 pages. Pure Oil Co., of Chicago, IL.  This manual would make a sensational accompaniment to your classic retro radio equipment.