Vintage SILVERTONE models 9647 (chassis 528.54230) and 9649 (chassis 528.54290)  AC operated 2-tube FM Stereo Multiplex Adapter. Original old Sams Photofact manual includes schematic, parts layout, voltage/resistance charts, alignment info, repair parts list and description. 4 pages. Dated 3-1963. Manufactured (supplied by)  Sears, Roebuck & Company, of Chicago, IL. This manual would make a sensational accompaniment to your retro audio equipment.