Vintage SONORA models 421, 422, 423, 424, 425, 426, 428 and 429  19 tube TV television receiver. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test chart, repair parts list. 20 pages. Dated 1953. Sonora Radio & Television. Corp of Chicago, IL.  This manual would make a sensational accompaniment to your classic video TV equipment.