https://atc.audio/hi-fi/electronics/amplifiers/pre/sca2/
This preamp replaced a very competent Luxman C900 u preamp. More everything and particularly more energetic. This thing has slam! Not bright, just slam. Class A circuitry and it just gets up and runs. More detail, wider sound stage, faster attack, deeper bottom and blacker background. Ignore the fact that the design is 30 years old.
It’s running my ATC 50 active which demand the best and have crushed tube gear (too slow). It is not a warm sound nor thin and edgy. I was surprised. Best of luck on your quest. $11,500 new. Talk to Tom at Big Ear Stereo.