Vintage SYLVANIA models 433B, 433GR, 433H, 433LU, 433RE and 433YE (Ch. 1-604-1) 4 tube Superheterodyne AM radio receiver. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test chart, repair parts list. 4 pages. Dated 1953. This manual would make a sensational accompaniment to your classic radio equipment.