darTZeel NHB-108 Model 1

DarTZeel NHB-108 Model One amplifier.  Highly desirable and  sonically revered tube-like solid state amplifier.  Multiple glowing reviews in the audiophile press.  Some quotes below from  the six moons review:
"The d'ART nails the midrange....The 108 present brass with that indefinable but real bite yet lacks stridency or hardness of any  kind.  The bass is killer-powerful, fast and precise. The drums aren't just heard but you feel the pressure waves.  Fatigue is non-existent.  The 108 allows music to fill its own natural space."      "The 108 is a dazzling tube-sounding amp cavorting around in the guise of transistors.  It has the best traits of tubes and solid-state-magic midrange with spectacular soundstaging. It is harmonically rich and satisfying.  The sound touched  my soul.  It infused air around the instruments sand made music come alive with a deep and powerful low end.  It is truly involving, with a gorgeous liquidity that conveys the emotion  of music.  Having graduated to tubes, I though I'd never look back.  The darTZeel has made me rethink that premise.  It's a  stunning piece of equipment that has raised my system to  a new level of performance.  Highly recommended." 
From Stereophile:

The darTZeel NHB-108 Model One amplifier (NHB stands for "Never Heard Before") is based on the triple principles of simplicity, purity, and reliability. That means the 108 employs open-loop input and output stages with no global negative feedback. Nor does it use relay switches or fuses in the signal path. It employs a scant six transistors per polarity side from input to output, and only a single pair of bipolar output transistors per channel. The NHB-108's output is biased to produce about 20W in class-A, and it runs rather warm—as in Careful around that heatsink, buddy! 

Achieving simplicity takes a lot of hard work, however, and the NHB-108 is definitely a piece of work. The CNC-routed aluminum casework includes inner and outer compartments: the inner compartment, beneath the case's "outer interior," contains much of the wiring; the outer compartment contains the massive power supply and the output devices, which are attached to the heatsinks. The storage capacitors are huge honkin' things, and the recursive, gold-plated buses that connect them to the circuit look like Victorian drafting tools—or maybe I mean Edwardian. You know, they scream elegance.

Nothing went into the NHB-108 casually. The case components are damped and decoupled from one another by absorptive bumpers, and the placements of all active devices were the subjects of constant experimentation by Delétraz. All of the 108's components are of extremely high quality. The binding posts are WBT, for example, but many others, such as the BNCs and those golden bus bars, look bespoke.

Did I mention that the darTZeel is handmade? It is—and looks it. Not as if I handmade it, which would have made it lopsided and only sporadically operational. It looks handmade like a . . . like a . . . well, like a Swiss watch. There. I said it.

The NHB-108 had it all. I just reveled in its deep, encompassing soundstage.

The NHB-108 placed me in that room with such precision that I could almost hear those low notes creeping along the floor like fog, seeking out the walls in order to bounce quickly back toward the microphones.

Yeah, that's an overheated fantasy, but the darTZeel let me hear so deeply into the space and the recording that my mind's eye worked overtime filling in the details. Not that there will be many left to your imagination—most of them will be right there in front of your ears.

If I had to reduce my review of the NHB-108 to a single word, it would be sweet—but that doesn't reckon with the amp's chameleonic nature. Every time I changed the associated gear, the actual sound of the system changed. That's the mark of a transparent component, of course—but each time I changed the associated components, I also thought I've never heard this sound better before—another sign of a truly exceptional component.

When John Marks heard that I had the NHB-108 driving the Aerial 20Ts, he sent me an e-mail: "Are you in love?"

And, of course, there's its performance, which is quite simply remarkable. I've already said that it belongs in the company of the components in Class A of "Recommended Components," but that almost seems faint praise. Perhaps we should establish a super-category: "Components I Would Run Off to a Tropical Island With."

Description: Solid-state power amplifier. Inputs: unbalanced voltage-mode (RCA), unbalanced "Zeel" (BNC), balanced (XLR). Output power: 100W RMS into 8 ohms (20dBW), 160W RMS into 4 ohms (19dBW). Voltage gain: 26dB into 8 ohms. Input impedance: >100k ohms, 5Hz–200kHz (RCA); 50 ohms ("Zeel"). Output impedance: <0.33 ohm, 20Hz–20kHz. Frequency response: 10Hz–100kHz, +0/–0.5dB. THD: <1%, 7Hz–77kHz. Signal/Noise Ratio: >105dB(A) ref. rated power.
Dimensions: 17.25" (440mm) W by 6.75" (170mm) H by 13.25" (335mm) D. Weight: 65 lbs (30kg).