From my experience I can write some lines about that.
Who makes good preamps ? I think, a few people who don't play the "new-breakthrough-model-every-year" game. These guys are more intelligent than the others, or ? Well, before this one I used Jeff Rowland Preamp ( also excellent ) but with this one I found my private sonic satisfaction. Some words to the ' Sound ' of this Preamp: Short Version: " Naturalness "
Longer Version: Nothing in my opinion ( Phono Preamp, too ) I' ve auditioned at lenght equaled the Klynes' see-right-through-'em-as-if-they're-not-even-in-the-system-invisibiltiy. I always wanted romance and warmth come from my music, not from my system, and that's exactly what the Klyne's do best. They are remarkable free of grain. There is no dust, smoke, haze, or fog clouding the window on sound. There is not even any glass in the pane. After listening to and through the Klyne's, other preamps seem a bit smudgy, making it harder to see through the air to grasp the details of the objects in the picture. I'd like to hear that last little bit of the dynamic continuousness which is here offered. The sound of the Klyne 7 Preamp is as natural as breathing. Superb.