Hello Joe,
I use a capacitor checker from Mr. Carlson's Lab, and that works very well. As far as your list of capacitors goes, I have had very good luck with Good-All capacitors! I have checked many of them and they were doing very well with no leakage. However, I have yet to find 1 Bumble Bee that is not leaky. I still test those but most likely they are replaced. High voltage capacitors, well, my checker can test them for leakage, but if the are the disc type, those should be fine. I have found the the Black Sprague capacitors goes, there are 2 different colors. And in my experience, the black caps with the yellow writing tend to be very leaky while the ones with the red writing don't have the leakage issues. I have one of those Chinese testers myself, does a rather pretty good job for a go-no go test!
Seleniums on the other hand tend to scare me. It's only a matter of time before those will fail, and I had one blow out that nasty smoke and believe me, was not pleasant to deal with. My whole house reeked for a long time before it cleared out. I actually have a conversion kit pulled from an old 531 scope sitting around somewhere, but I don't know if that would work with a 575. That is one piece of Tektronix equipment that I would love to have.....for a reasonable price that is.
Brenda
Joe