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

A Carver TFM-35 I bought NOS sealed in the original box from eBay in 2009. I still have it.

When hooked up to the Don Sachs preamp gives very little away to his Kootenay. I was surprised that it had very similar upper end resolution. It lost out in lower midrange resolution and bass.
Both things that could be resolved with some careful modification.

Also my Technics 1200G. First upper end component I ever bought. Total end game piece that I will probably never give up.

Bought mint used Infinity IRS Beta’s over twenty years ago.  They are still mint and will never sell them unless someone wants to downsize from their IRS V’s.   Wish my hearing was improving, not declining.   

My favorite is a pair of horn-loaded 3-way speakers from the 1960s that were my Dads. University "Dean". They are huge and heavy and super-efficient (103 dB at 1 watt at 1 m). I have them at a vacation home and am always blown away by how great they sound. Big live, natural sound. You can feel the air movement when they are cranked. This system rivals my main system that costs 15 times as much. Unfortunately, I will have to sell them soon as we are downsizing, let me know if you are interested.

My biggest regret was selling a Sansui  777 integrated amplifier back in college. I have yet to see another one. 

Woodsong Garrard 301 wt Triplaner arm and Miyajima Shalabi cartridge. The beauty of it and the function always thrill me. Not to mention its drive and impact. Never had another TT that recreated music with such reality. And I just love to look at it doing its thing!

15 year old Magnepan 20.1s, originally $12,500, bought for $5,500 right here on Audiogon. Magnificent sound.