I've never turned over a lot of gear and have only ever sold/traded in three amps anyway.
1) Hohner Panther 20W practice amp - horrible POS I have no desire ever to own again. I'd like to apologise now to whoever ended up with it, it was cruel to inflict that on you.
2) Fender Bassman 135 head - when I first got it, it needed a service. Took to the local TV and radio repair guy who sorted it out and put a set of valves in that meant it was clean all the way up to structural damage levels. Fantastic clean sound and took pedals well. Put away when I got my rack system and then my first Trace Elliot combo. Eventually got it out and it needed a service and that guy put some different tubes in that broke up earlier which wasn't what I wanted so I eventually sold it as it was never getting used. If I had the space, spare money, and could have the original version clean version back, I would.
3) Small little valve head, can't remember the name but think it was a kit someone had put together. Picked it up in a second hand shop for £20. 2 separate channels, one hotter than the other, a volume control on each, and shared treble and bass controls. Great sound and also took pedals well. I knocked up a cheap and nasty chipboard 1x12" with an old Goodmans speaker to use with it and it sounded great. No idea what happened to it now, whether I sold it or traded it. That amp I'd have back like a shot if I came across it again.