Yamaha THR10 does a lot of that already
Ya, that's my fault for not knowing anything about a Yamaha THR10, but now that I forced myself to suffer through the write up propaganda on Yamaha's web site & the accompanying PDF file, I now know far more than I ever cared to! LOL
OK, it sounds like a useful enough & versatile little amp as far as 10 watt SS amps go! I still think a CODE 25 would be a big step up in many ways & up your game but....
I totally get the need & ultimate desire for the next amp to be a tube amp!
Problem is, a lot of these little tube amps just have a hard time doing what larger tube amps do. But there are a couple small tubers out there that do a decent enough job that can satisfy a tube amp Jones. I have several small tube amps but some of the ones I really like & use the most are actually out of production. Most notably & preferred by me are the two 1 watt Marshall Anniversary amps I love (JMP 1C & JVM 1H).
Marshall Anniversary 1 watt models JMP 1C above & JVM 1H below.
Those amps sound frik'n great even on the 0.1 watt setting! I know! That is amazing! lol However, This Anniversary series consisting of those 5 various amps (in both head only version & amp + speaker cab combination) is out there in the used market & can be had at decent enough prices by smart buyers willing to wait for a bargain to pop up or by play an educated auction game.
FYI: As you may now have gathered, the Marshall 1 Watt Anniversary amps are no longer made.
However, They are very collectable & desirability is sure to continue to only increase with time.
Actual Resale Prices are only going steadily up, making them a good investment to spend your money on.
The other small tuber I have is the Vox Night Train 15H (15 watts with a 7 watt switch).
(That Vox sounds amazing with 2 Vox 1x12 ext. cabs)
This bitch can really get loud and, it has very authentic tube amp characteristics that allow it to feel, sound & respond just like the big boys, which I'm beginning to kind of think is the sort of amp you are looking for. This 'Lunch Box Vox' 15 / 7 watt amp has wide tonal range & has a lovely clean tube harmonically full sounding response. Plus it has all the varying degrees of tube driven nastiness that's achievable ranging from a Vintage Drive 'bump' & a great Rock 'n Roll Crunch that runs mild to wild & goes all the way to a full on pant leg slappin, low note thumpin shredders dream scream machine! Yee Haah!
That's all the first hand knowledge I have for anything reasonably newer that's a 'small' tube amp. After those my arsenal quickly falls into the Vintage collection of small tube amps. And there are some great options there too if you can stand going from that multi-function Yamaha to a simple circuit tube amp with zero control over gain beyond the one Volume knob!
Hold on, don't run now! You made it this far. These simple amps have a tonal beauty that is hard to come by today in ANY newer amplifier!
Two of my personal favorite small tubers are not the typically expected Fender variety but 50's era Gibson combo amps. A Gibson BR-9 & the lower wattage Gibson GA-5 Skylark.
(Gibson BR-9 above, GA-5 Skylark below)
The BR-9 runs 6v6 tubes and goes from old school clean fidelity to volume pegged Rock'n Bark'n 50's grungy growl even order tube harmonic saturation blitzkrieg bliss! While the GA-5 Skylark's forte' is a pristine clean that sounds pure & beautiful as anything I've ever heard, but unlike the BR-9 that gets new life when cranked, the Skylark stays clean until farting out close to max volume & just turns to unusable poop, unless of course your looking for that saggy indiscernibly muddled poop tone for some reason.
Oh ya, I guess I should have been a little clearer as you wrote...
Mate, stay out of prison! We'd miss you if you weren't posting.
LOL I left with a pension, not on parole! lol
I know you couldn't believe for a minute I was a hardened ex-convict that was put away for a quarter century. Maybe for a second or two while the question swirled around in your head, but definitely not for a whole minute! LOL
Keep on Rock'n mate.