bunch of books on scopes and some small test gear you can make.
also, how to make high voltage scope probes, and how CRTs can be used to store data. That's for those vacuum tube folks who really hate solid state.
10 books + other information about oscilloscopes including how-to-build/repair, and related gear
http://bunkerofdoom.com/lit/CRT-scopes/index.htmlHow CRTs are used as RAM and analog memories
http://bunkerofdoom.com/lit/CRT-scopes/CRT_memory/index.html