Lot of late 1950s and early 1960s vintage technical books on troubleshooting and diagnosing vacuum tube problems. There is TV and Radio Tube Troubles by Sal Heller and copyright 1958 with 224 pages. There is also TV Trouble Analysis by Harry Milleaf, copyright 1961 and also with 224 pages.

These have wear and soil from storage and well as minor worm damage to the edges of the pages.