I recently bought a 0-35V 0-3A (105W) CC/CV linear power supply, made by Takasago in Japan, second hand. It's a nice unit, and inside of it is a massive power transformer along with three pass transistors on a very large heatsink (it is interesting why there are three transistors but I can only suspect that they are to reduce the load on an individual transistor), and it weighs a ton. I've fully tested it to 105W, although only for about 5 seconds as even my 2x25W resistors were getting too hot.
I originally had plans to put it on top of my HP 54501A, a digitising oscilloscope with a CRT raster monitor (unlike a normal CRT scope which draws a trace by moving the electron beam - this sets pixels on and off representing the trace.) However, I found that when turned on, whether above the scope or on the bench below, the CRT would have a weird ripple effect or would shift position randomly. It didn't matter if the supply was loaded down or not. The trace was not affected, just the display (even text and graphics). Why would the supply cause this? I suspect it has something to do with the transformer because that makes a humming sound in operation if you listen carefully.