Is there a Solid State amp that can satisfy a SET guy?

Have been a SET guy for so long I have forgotten what a good SS amp even sounds like.
Just bought a pair of $33k speakers that will replace my current $16k speakers. Both are from the same designer and both are 92db and a flat 8 ohms. The new ones arrive in 4 days!
My 300B based amps well drive my current speakers even though I do use the system nightly as a 2 channel home theater. Especially considering the HT usage, I think I may enjoy a SS amp with many times the horsepower. The speaker designer suggests using a Leema Hydra II. I have written to Leema telling them of my 300B preference and they assure me that their amp does not have the destructive harmonics that make a SS amp bright. There must be other SS amps that can satisfy?
Sound-stage is based on volume (not phase dependent), ear to ear timing cues (also not phase dependent as long as shift is same for both speakers). That also primarily happens much less than 20KHz.

I don't think I have ever read any experiment that shows the ability to differentiate anything but quite significant phase shifts.

This is all true. However there is a reason that wide bandwidth is a sought-after thing going well back (Stewart Hegeman, designer of the original H/K Citation series, felt wide bandwidth to be quite important). That reason is simply while the ear is insensitive to phase in sine waves, triangle waves and the like, it does use phase information for echo location and so does respond to phase information when a spectrum of frequencies are involved. It also interprets phase shift as a tonal coloration; a change in FR one or two octaves outside of the audio passband can be heard as a tonality in the audio band, with little regard for the loudspeakers involved. I had this demonstrated to me in spades about 30 years ago when I was sorting out an MFA Magus preamp in my shop; the complaint was brightness in the phono. It turned out to have an extra timing constant that set the phono EQ to flat at 50KHz. This was clearly audible as a brightness. By simply removing the components responsible in the EQ network, the RIAA slope was restored (at 50KHz) and the brightness removed. When the RIAA curve was tested using an inverse RIAA network, it was perfectly flat up to 20KHz before and **after** the change. I passed this information back to MFA and they incorporated it into their later production of that preamp.

In high end audio we are always concerned about the nth degree; if you really want to get soundstage right, you need wide bandwidth in the electronics even though the speakers won't reproduce it. And we also want the tonality to be correct; especially in an amplifier with a higher output impedance like an SET its going to have FR errors; it will do it no good if it sounds dark on top due to a rolloff above 20KHz.

Alternatively you can employ enough feedback so that the amplifier can compensate for phase shift in the audio passband. But to do that you need north of 60dB of open loop with good Gain Bandwidth Product and good phase margins, since you'll need to blow off 35dB of that gain (if we are talking about a power amp) with feedback.  This is next to impossible with tube amps and very difficult with traditional solid state designs (to my knowledge the Benchmark is one of the very few to do this). The most common amps that employ this much feedback are self-oscillating class D amps (mostly designed by Bruno Putzeys).

For example, one ’higher power output single tube’ amp has Bandwidth listed as 10Hz through 60kHz.

Almost any power tube has bandwidth from DC to several MHz at least. We have 40MHz bandwidth in the output section of our amps- we intentionally limit the bandwidth in the voltage amplifier. The real issue is the bandwidth of the output transformer (which we haven't got).

The power bandwidth and the low power bandwidth are two different things BTW. I'm of the opinion that they should be nearly the same. But in many amps they are not- its common for the 1 watt bandwidth to be much wider than the full power bandwidth. So it might be a good idea to get some clarity about what is meant by
Bandwidth listed as 10Hz through 60kHz.

@atmasphere  Thank you for the insight. I will look into it.

This has been educational and helpful. Much appreciated. 
Hi everyone

Pass Labs class ‘A’ amps, to my ears, are magic. I have owned the xa30.8 and I just love it. My speakers are extremely inefficient (83db) and it not only drives them effortlessly but it always remains so musical. I have a tube preamp for that tonal color and accurate timbre. 

To all the other Pass Labs amp owners out here, leave it on always. I have noticed that every time I have to unplug it from the wall, it takes exactly 3 full days until it sounds right again. There are subtle temporal cues that you can hear when it’s been fully warmed up that just aren’t 100% right when it’s just been turned back on. I leave mine on all the time and it always sounds amazing!

@david_ten My best advise is to forget about specs just go listen to the equipment your interested in first. Let your ears be your guide, knowing specs before hand can influence the brain and what you think your hearing.

I have decades of 211-845 amp use, Audio Note Ongako and Kagura 211 amps, Sophia Electric 845 Mono Blocks and LM 845 amps. If you went by specs alone you would never listen to these amps, sound wise they are some of the best sounding bar none. My personal preference are the 211 tubed amps.
@scothurwitz I purchased a Pass XA25 a couple of months ago and i agree there is some magic (voodoo) going on. Once they get past their burn in time the XA25 took 120 hours there is some magic to be had. When i bought mine it had a ten day trial where i could have sent it back and i almost did a couple of times but once it got beyond the 120 hours it has settled down and has been near perfect and this is coming from a SET guy. The Pass is the best SS amp that i have heard and i have tried many including the latest D amps.