I bought an analog Hewlett-Packard oscilloscope today. It was designed in the 70s, built in 1985, and decommissioned by the US Navy in 1993. Still going strong apparently. It’s about two feet long (which is not evident in the picture, but it does not fit on my recliner). I don’t have any test leads yet, but this is one of the two tools I needed to start working on switch-mode power supplies. It also makes me feel like I’m back in my Circuits I class with lab equipment that rarely worked. Hopefully this will go better!