What's the best and/or favorite piece of equipment you've owned? And do you still own it?

Without a doubt it was my McIntosh Power Controller.  I couldn't believe what a difference it made.  Don't expect I will ever get rid of that thing, unless there is no room for it in the retirement home.

I love every piece of equipment I own 

For me my tannoy Legacy Ardens bought 18months ago and only gerting more enjoyable with every listen.... And luxman 550ax2 it just does everything well. Controlled musical and a great phono stage as well. 

Lots of cool stuff.

Lots of interesting vintage equipment!  My favs are more modern but I remember as a kid my dad bought me a fisher component system for xmas that had a dual tape deck and turntable that kicked off my descent into the rabbit hole of high end audio.  I spent hours making mix tapes and playing 45's - it was for simple enjoyment of the music.  Was it the best ?NO. Was it my favorite? NO, but it was a lot of fun and nostalgic.

Keep the responses flowing!  Good Stuff. Plus, I learn from what people use!