Any regrets in selling gear?

Sure, however it opened opportunities to try others. As some have indicated here, after they cycle through a bunch of stuff over the years or decades - sometimes , they go back and repurchase that lost piece of gear to tray again to see if its as good as they recalled the first go-around. Sometimes it is, and other times it might not be.

@dekay "...but much prefer DH/SET to them (mainly miss the PAS preamps when running tape/line through them - phono was so-so)."

I still have one DH preamp and let go of all of my higher power DH/Cary and lower power DH/Inspire amps. Came close to Dennis building  me a pair of KT88/6550 monos but the build-deal fell apart.  Which DH/SET do you still have?

"@dekay Decooney: I have Bottlehead Paramours paired with vintage Elac S517 wide band drivers in Acousticraft cabinets."

Nice, that Paramour kit looks like fun to build. By chance did you get a chance to directly compare them to Dennis’ recent 45/2A3 amp then? My buddy has the 45 amp with horn speakers, likes it quite a bit. However he's on to other amps now as well craving just a tad more drive. Boy those Elac 517s are rare these days and bet that sounds nice paired up with your Paramours. Keepers for sure! :)

@bgross Audio Note, Meishu Line... Good God, what was I thinking!?

Ouch, can truly relate. It’s a work of art inside too. I listen to the Mieshu integrated at a friends place every few months, and compare sound to more expensive amps further up the AN line. For my own use, I still have that one on my list to own one day. Not sure my existing speakers would match well but its a future goal :)

@dekay funny you say that, re:

"I keep planning to go with a simple SS setup with more traditional speakers, but doing so keeps getting put on the back burner."

Last year I had a friend who worked at Threshold for Nelson upgrade a Pass/Forte’ true Class A 50w SS amp for me recently, having the same simplicity ideas. Matching F44 preamp too. Super nice for what it is. One small aspect is missing. I listened to it over the summer for like 90 days straight leaving it in place. Swapped the all-tube system back in, and quickly realized I’m not getting rid of my tube system for simplicity any time soon if I can help myself. The layering is just unmatched with my all-tube setup, likely same as yours. Maybe a simple smaller SS integrated to swap in once in a while. Won’t be doing any serious listening with that though, maybe for background music just to have it on,  LOL.