It's all fine information you're supplying, but not pertinent to the thread. At the volumes I listen to, NO amplifier will exceed two or three watts of output. Most of the time, I listen in the ½ watt output range. At those volumes, just about all amps are "Class A." As I said, I can get sufficient output from my 10 watt Heathkits to irritate my wife, and those tiny tykes sound more dynamic at those low volumes than ALL my other amplifiers.
I think your can get what you need by paying attention to the type of valve used. I suspect you want to stay with valves first of all.
I like tone controls on some of my setup, depending on the source and the recording. If you're into Vinyl, or RtR that's one thing,
streaming, CDs and a loaded server is different too.
Low LOW volume listening usually take a different type of BIAS setting in the real world of valves. If you can't set the bias, I know you'll need tone contour at least
I'd go with KT66 or 6L6 valves for low level listening too. I know what would work with my gear, the issue is you need more preamp control not less IF you can't adjust
the bias HOT for lower level listening on your power amps. To be able to change the bias and the type of valve is the real reason you could take a lot of the tone control
off the table. I use C20s because they CAN color or NOT color the sound, but most of all it has a BASS contour, Bass tone controls, and loudness contours TOO.
Just for LOW level listening a C20 (rebuilt) and a MC240 or V12r because of the way the amp works are my choice, but I own a few.
V12r is A/B but variable tube NUMBER and type. 4, 8 or 12 valves. You can use 6V6,6L6,KT66,77,88,90,99, El34. You can flip 6 toggles to go single ended, too.
I'll be honest, The GAN amps are great. I have a 2 and 400 model. Pretty impressive to say the least. NO they are not valves but that is in how they are voiced and
it's my understanding some sound very good because of the tweaks and feedback. Peachtree sure is nice units. 32db of gain and tone control. It's an alternative.
Don't become to tube snobbish, you might miss some real nuggets in the SS world.
I tried a lot of the Schiit products, I always went back to Manley for my EQ. I had a D.W. Fearn VT-4 a buddy brought over. I'll stick with the 20 year old monster
I haven't used it in 5 years.
I often wonder how the Dahlquists would perform with GRs OB servos. I have a feeling that would be the cats meow at volume.
DQ-10s were wonderful speakers. I ran mine on Mac tube gear at the time. Maggies and 57s too, sure fun.
Room acoustics at 1/2 watt can be tighten to a lot closer proximity too.
Fruit for thought.