The back end of the picture tube had 15kV on it if it was a black-and-white set, 25kV if it was color.
My dad invited an engineer friend from work to our house when I was seven or so. I told the guy I wanted an oscilloscope, and he proceeded to talk my dad into letting him make one out of our Philco television.
He made a big deal out of telling me I had had had to make sure the HV power supply was discharged before I touched anything. His stern warnings made a lasting impression.
My dad convinced him to give up the project before he actually got the oscilloscope working.
I was a little bit disappointed, but he also had made me queasy... I was afraid he might break my beloved TV set! No more after-school science fiction movies! No more Jetsons!
I wanted an oscilloscope, yes, but not that much.
I remember clearly one afternoon I decided to see what would happen if I pulled out a plug part way and touched both prongs simultaneously. That was a useful lesson.
At one point I built a power supply so I could play around with some old CRT’s that had come into my possession. It was good for about 1500 volts, no idea how much current, but I suspect it had lethal potential. I was pretty careful with it, though.
Eventually ended up with a cheap Heathkit oscilloscope.