Vintage WIRETONE model MR-6 7 tube Superheterodyne AM radio receiver, phonograph, and wire recorder. Original old Sams Photofact manual includes schematics, layouts, alignment, adjustments, voltage & resistance readings charts, parts list. 6 pages. Dated 1948. Molded Insulation Co. of Philadelphia, PA. This manual would make a sensational accompaniment to your vintage audio equipment.