Should I got full tubes or stick with hybrid amps?

@jdane   

Good idea. I'll check them out.  

I own both a Raven Blackhawk MKIII (tube) and a Pathos Acoustics Classic One MKIII (true hybrid) both are great integrated amps but the Pathos has a better soundstage and is way cleaner.

Buy a Pathos and put it all to bed. 

@soundchsr

I'm still learning but my guess is that

(a) your corner windows are a problem, as is the glass front on your fireplace
(b) you have different items behind the two speakers (asymmetrical)
(c) your first side wall reflection points are an issue, too
(d) glass framed things are a problem.

I cannot see your rear wall.

So, my guess is diffusers and absorbers in various places.

Watch some Acoustic Fields videos as a starter. Here's the first pull on that thread:

https://www.youtube.com/watch?v=ZQIV341IUCg&ab_channel=AcousticFields

How would you treat this room?

https://ibb.co/pJ0pxVx

I gather you listen quite a bit from your desk.

1. In my office, I re-configured my desk, no drawers on the right, so that I sit off-center of the desk, thus centered on the speakers, and the monitor also centered on the speakers for all the music videos I stream.

Never better sound/imaging in my office.

2. Next: dogs OUT, the breathing, scratching, licking, lip smacking, farting of large dogs is not a good mix with concentrated listening.

3. I might try tilting those speakers up some, just to hear if any difference.

4. Do you pull that black chair out in front of your desk for focused listening? Slightly angled up might reduce tweeter’s output, may be advantageous regarding fatigue from such close focused listening.

5. Tubes: I say yes to all tubes, perhaps try something you can return or sell without too much loss.

two concerns.

a. speakers 88 db sensitivity, needs more power, i.e. 4 power tubes each side,

b. thus more heat. It seems like your equipment is behind those closed cabinet doors? Tube amps, especially that size tube amp wants lots of air for heat to escape.

6. Integrated Tube Amp, with remote volume, tone controls, and preamp bypass to bypass the tone controls if you want. Tone controls may be the best solution to your fatigue issue, neutral or adjusted for particular music.

Tone controls can be the real stumbling block since, for some un-fathomable reason, most designers have decided they are no longer required. Another factor is the type of sound you are looking for. You've stated that you don't like fatiguing highs. Depending on the tubes, even full tube set ups can sound harsh. One unit I will throw out there for you to consider is the Vincent SV-237MK hybrid integrated amp. It has a three tube pre amp stage with a very good solid state amplifier. Two of the tubes are 6N1P-EV's which pretty much don't have many sound changing replacement options. The third tube is a 12AX7 which gives you lots of options to change the sound. Besides bass and treble controls, it has a tone bypass, and something that used to be standard on just about everything, a "loudness" switch. I have owned one for awhile now and it is an excellent sounding integrated. At 150 wpc at 8 ohms, it will drive any speakers with ease.