Piece of Audio gear you regret selling

Had a Classé DR3-VHC. Once a non-audio oriented friend thought it was a fireplace!!! LOL. Boy did it sound nice though. I know the new owner still has it.

The only gear I regret selling was my very first transaction which put me on the path of Audiogon, etc. - a pair of ADS L810's in mint cond. However, I will give an honorable mention to a CAT Ultimate MkII with CD taper volume that I sold a couple of years ago. Honestly, I can live without either since the gear I have now makes the best music I have heard in my house.

Not just a piece of gear but my entire house that contained the BEST sounding room I have ever had. I have never had another room come close to that. Early 80's, I had it made and haven't been able to get it back.

Sold my Aesthetix Calypso with NOS tubes for $2300, only to buy the Signature version Calypso a few months later.

I regeret selling a Threshold FET 10e. This preamp was far and away as good as an Audio Research Sp11 or 15.