Vintage SENTINEL models 1U500, 1U510, 1U511, 1U512, 1U513, 1U515, 1U520, 1U521, 1U522 1U523 and 1U525 19 tube TV television receiver. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test chart, repair parts list. 23 pages. Dated 1954. Sentinel Radio Corp., of Evanston, IL. This manual would make a sensational accompaniment to your classic video TV equipment.