The only tube pre-amp that had a sufficiently low noise floor and proper bass control in my system was a Wyetech Labs Opal (with upgraded tubes) paired with a 14B-ST. This combination produced tube bloom, holography and texture coupled with very articulate bass. I use a BP26 with my 14B-SST2, and have paired the Opal with Wyetech's own excellent Topaz SET mono-blocks.
Other tube pre-amps which did not work properly in my system were: Cary SLP98 (textured sound and open mids but uncontrolled, rolled off bass), ARC LS26 (bland and veiled), Audio Note (forget the model but bass rolled off), and a Chinese tube pre-amp (very affordable but too noisy).