McGohan 102 PA Amplifier:
Had it for over 40 years now. It's been used as a mono music amp, and a PA amp. Most recently (and that could be 10 years now) it was used to drive a 70V line system at dressage horse events. At that time, and without my permission, some one "fixed" it for me, and I have not tried it since.
Harman Kardon A224:
Newly purchased on eBay, and I re-cap'ed it. This is basically the home listening amp I have always wanted.
Leslie Lowery 45A Organ Amp converted to Stereo Power amp:
Purchased locally in a "couldn't refuse" situation. It is very nicely completely rebuilt (not by me or the seller) as a Hi-Fi amp with basically new everything except the iron. I built a Lexan bottom for the chassis.
Very Old Aircraft Radio:
This was from one of my mother's airplane's, so it has been in the family since new (probably close to 70 years). Receive only. In pretty poor condition now. I think I did have it working when I was a kid.
In the past, I have had:
A dark blue and white table radio. Don't remember much about it. I guess it was AM only, but I don't know what I would have done with an AM only radio. Even in my childhood, there was not much on AM. Sold at a Hamfest.
A Halicrafters SW Radio that someone painted flowers on. Sold at a Hamfest.
I had a 9 inch GE B&W TV when I was a kid. My parents said I could not have a TV in my room. The neighbor gave it to me not working, so I asked my parents if I could keep it if I fixed it. They confidently said "Sure". I powered it up, saw that it had a raster, but no signal, so I swapped out one of the tubes on the tuner, and it worked fine for years. It was also my first computer monitor.
Then the same thing happened with an (again GE) Tube Color TV. This one was a little more of a challenge. After changing several parts in the HV section, it worked, but would occasionally let out a firecracker snap, and a puff of smoke. It worked this way for years -- until I moved out.
A Conrac Green phosphor monitor. This would also let out a loud crack every once in a while.
Several Tube Oscilloscopes, including one that used to be part of test (ground) equipment for a U-2 spy plane, and a Tektronics RM 561 that would make all the lights dim in the house when I turned it on.
I'm not sure if Nixie and VFD tubes count, but I built a clock kit with 7-segment (not real Nixie) tubes when I was a kid.
More recently, I built the "VFD -- IoT -- WiFi -- NTP -- WWW -- LUA -- ESP -- NodeMCU--Clock"
http://linuxslate.org/Project_NodeMCU_Clock.html
This and my HK A224 make for a cool "retro" bookcase head board.
I also had a (true) Nixie digital bench meter at one point.