I have many oscilloscopes and other pieces of test equipment of various types due to work, but my by far favorite (and cheap-ish used) scopes to use are the old Tektronix 400, 2200, and 2400 series. These guys have a complete list with details: https://w140.com/tekwiki/wiki/Main_Page . I'm a big fan of finding them used on ebay ("Used" condition - implicit 30 day warranty) and one can have a very capable, very accurate, and great use use scope from $60-150 for something analog. They also have full service manuals with schematics. I use a digital 2440 with tekmate for glitch detection and saving waveforms.