The reason I bought a used Mark Levinson 326S is due to its ability to create the most realistic 3D soundstage illusion I've ever experienced through a ss preamp. Spatiality up the ying yang. Its ability to present properly sized,well detailed, stable and solid images in a wide, deep and layered overall soundstage with a sense of air and space between them in a realistic and palpable manner is truly amazing. impressive and enjoyably addictive.
I just happened to be in the room during another individual's demo at a local hi-end audio shop when I first discovered its incredible ability. I used a VTL 2.5L preamp at the time, with a set of 4 expensive NOS Mullard tubes swapped in for the standard Russian or Chinese glass, and I wasn't even considering a preamp switch or upgrade before I experienced this ML 326S's ability to present a soundstage illusion that was so palpable and walk through realistic. It also has very accurate, natural and neutral tonal timbre and pitch qualities, however, with any perceived warmth originating solely from the music itself and not from a deliberate design choice of added even ordered harmonics.
It sounds silly, but I hope this preamp's accuracy and neutrality isn't a deal killer for you. If it is, Pass may be a better choice for you due to their reputation of adding even ordered harmonics, and its resultant warmth quality, to both their preamps and amps.
Tim