The SW1X Audio Design LPU I MM phono preamplifier | D a r k L a n t e r n ...nz hi-fi audio music film forums

According to the company's website (footnote 2), Dr. Slawa Roschkow is SW1X's founder, managing director, and chief audio engineer. ("SW" refers to the first and last letters of his name.)
The standard version uses one EF86 pentode tube per channel for the input stage and one 6N6P dual-triode for the output stage running in a pure class-A. There's no negative feedback, and RIAA EQ is passive RC (resistive loading/capacitive decoupling
The Special version features 5Y3 rectification, Audio Note copper-foil-in-oil caps, M6 EI grain-oriented–core power transformers, and a choke-filtered power supply, for $4295.
If I had to sum up the SW1X LPU I—and I do—it's a high value, smartly designed, classic, "purist," vacuum tube–based MM phono preamp that achieves all of the positive things such circuits can offer—especially timbral and textural generosity and transient delicacy—at a very reasonable price, while avoiding pitfalls such as noise, limited bandwidth, soggy bass, and constricted dynamic range. It's a sweet-sounding phono preamp, great for jazz, classical, and acoustic music. If you're mostly a rocker, you're better off with silicon. That's just the way it is.