I would try conrad johnson. They are very good at replicating or coming close to tube sound with their ss designs. But really what is the problem with a tubed pre? The tubes last a very long time and have non of the heat or maintenance / cost issues associated with tube amps.
I have also have a tubed pre (cj) and have never had any issues with it.
I have also have a tubed pre (cj) and have never had any issues with it.