My favorite in this category is the Nakamichi CA-5. The build and parts quality inside these units is far above the competition. You don't mention price but for the money used, the sonics are excellent. I have owned quite a few vintage preamps (two CA-5s) from different manufacturers. It's a habit of mine to remove the cover for a peak inside and the CA-5 is extremely impressive.
Sleeper older preamp with great phono.....
Looking for vintage preamp with very open, quiet phono stage...any sleepers around?