Just wanted to post a tidbit here that isn't meant to offend, annoy, or ruffle any feathers.
Euforia was my dream amp for many years. I finally purchased it last year and I liked it. I did copious amounts of tube rolling on it, utilizing many NOS tubes, as well as many new production models as well.
Thus, I had lots of 6SN7 / 6AS7 (6080) tubes laying around, including many multiples of each which were just about identical to one another. On a whim, I decided to purchase the xDuoo TA-26 a few months ago for $300 or so off Amazon. They're both OTLs, and like the Euforia, it used the same exact tube types. I owned both extensively for months, swapped back and forth every so often, got many people to do listening and swapping tests with me (dragged the spouse, friends, and my parents into my shenanigans) and whatnot.
And the conclusion that we all came to... is that they sound almost identical. Euforia has a slight edge by about 10% in the sense that it just does everything across the board ever so slightly better. Mind you, I do mean ever so slightly. Luckily, I had multiples of three different 6SN7s, so was able to A/B directly comparing to the amps rolled identically. I also had multiples of several identical 6AS7s which allowed me to roll both tube types identically in both amps.
They are extremely similar. Like I said, Euforia has an edge by about 10% or so. If I knew how to mod, I'd mess with the caps and resistors in my xDuoo, seeing if I could squeeze that extra bit of performance out of it that Euforia has. I have friends who can do such mods, and I'm thinking of picking up another TA-26 for $300 bucks and seeing if they can just put in $50-$100 (at best) worth of upgrades inside to give it that extra bit that the Euforia had.
Anyway, I sold the Euforia, and I was worried that I'd miss it, but when I listen to my TA-26, it honestly sounds so similar to it that I'm not super bothered. Yeah, I'm aware that Euforia had slightly better performance, but one was $300 and the other was $2,700 and I'm not convinced that a handful of internal mods to the TA-26 won't bring it up a notch. I plan to try that theory out very soon.
I know current Euforia owners might scoff at this, and if you're perfectly content, then I'm glad. This post is mostly for people who have never heard one and are on the fence on whether or not they want a Euforia. It won't do headphones with as low of an impedance as the Euforia does, but if anyone is curious about what a Euforia sounds like, I highly recommend the xDuoo TA-26. They sound very similar. And from there, if you like it so much that you want a marginal gain in performance, that just ever so slightly elevates it in all regards, then contemplate dropping $2,700 on a new one or slightly less for a used one. But in my case, even though I could have afforded to keep the Euforia, and didn't need the money I'd gain by selling it (and taking a rather big loss on selling it too), I just struggled to keep both when they were that close in performance and one was $300 and the other was $2,700. I know people will say that my cheaper one is Chifi and the Euforia will likely outlast it. Luckily, if that happens, I could literally buy nine TA-26 amps for the price of one brand new Euforia, so I'm not too fussed. It's also a lot smaller and easier to ship, and I know plenty of people who know how to repair amps, so I don't mind having it looked at if issues arise in the future.
The Euforia and TA-26 are EXTREMELY similar in the bass, mids, treble, etc. depending on your tube choices. I would say the Euforia (I had the non AE version) is a bit more neutral while the TA-26 is tilted a bit more warm, but other than that, they're very similar. Euforia has slightly more resolution, clarity, soundstage, etc., but it was a marginal difference. For anyone on the fence, I highly recommend trying the $300 xDuoo TA-26 first and then deciding if you want to drop thousands on the Euforia, which does perform slightly better (plus is capable of driving lower impedance headphones) and returning it if it ends up not being your cup of tea at all. Because trust me, I lusted after the Euforia for years, and felt extremely deflated when I ran into a $300 amp that used the same two tube types and got so close to its performance that there were times my spouse, friends, and parents could barely tell them apart when I dragged them into listening sessions over the past few months. That's why I decided to sell the Euforia. I still like how it sounds, obviously, but I weighed the pros / cons of keeping it, and just decided that it was too expensive as far as the cost to performance ratio is concerned.
That's just my two cents. If it helps anyone, that's all that matters. It isn't meant to offend or come off insulting in any way. This is just my experience, and the experience of those I know, and these are the conclusions that were reached after many months of ownership and usage.