Audio Research's new SP20 tube stereo preamplifier ($9000) combines a full-function linestage and phono stage, and includes a hi-resolution tube-driven headphone output, touchscreen control, remote control, and both balanced and single-ended inputs and outputs. The front panel echoes the Minnesotan company's fabled SP3 preamps from the 1970s. Listening to the company's first preamp in 20 years to include both a linestage and phonostage via Sonus faber Olympica III loudspeakers, I heard both the classic Audio Research midrange and a fast response that served bebop extremely well. Bob Reina is working on an SP20 review for Stereophile.
Audio Research's New Stereo Preamplifier | Stereophile.com