Hello! So first I want to say I have very little experience with oscilloscopes other than using one on a computer program. So realizing this, I took it upon myself to buy a used analog one to learn. I bought it for 20 bucks on ebay and the disclaimer said "Do not know if it works!" I took a shot, its only 20 bucks! Well I got it, plugged it in, and while I did get a back light on the screen, I didn't get any beam across the screen, it was just blank. I tinkered around with everything thinking maybe the beam might have been positioned off the screen or the trigger wasn't making the beam move across the screen but nothing I did worked. I didn't hear any noise coming from inside. I have a lot of experience with taking things apart and fixing them. I work on cars and computers so I figured I would give it a shot. So I opened it up (I know TV's have a very large capacitor so I was careful of where I was probing because I assume this is of similar engineering.) Nothing seemed obviously wrong (ie: no broken wires or corroded connections from what I could tell.) Now here is the part I need some real input on. I roughly know how cathode ray tubes work. I know that an element has current run through it and this creates a cloud of electrons, from there the electrons are accelerated through the glass tube by anodes and onto a phosphorous screen. The element in the back of the CRT was very dim, but I cannot base this observation on anything since it is the first time I have opened an oscilloscope. But a bad CRT would certainly explain the "no beam on the screen" problem! Is there anyway to repair one of these things? Or purchase a new one? I am basically doing this for fun, as I said I love to take things apart and fix them. So it certainly isn't important for this to be fixed. Opinions?