Vintage SENTINEL models 1U-1101, 1U-1111, 1U-1111, 1U-1121, 1U-1124, 1U-1126, 1U-1127, 1U-1131, 1U1134, 1U-1136, 1U-1137, 1U-1145, 1U-1147, 1U-1155, 1U-1157, 21101, 21121 and 21145  AC operated sixteen tube TV television receiver. Original old Sams Photofact manual includes disassembly instructions, schematics, parts layouts and photographs, alignment instructions, tube failure check chart, voltage/resistance measurement chart, repair parts list and description. 18 pages. Dated 5-1956. This manual would make a sensational accompaniment to your retro television equipment.