High quality step-up transformer from K&K Audio, with Lundahl Transformer. I used this step-up in conjunction with a Graham Slee ERA Gold V Moving Magnet phono pre-amp, and the combination really sounded great. This particular step-up can be purchased as a kit, however this one was assmebled by K&K Audio. They're located about 45 minutes from my house, so I picked it up from the owner. He really had some great equipment at his place of business, much of which he designed himself. I'm selling because I sold my Graham Slee and am planning to purchase a Parasound JC3, once I actually find a used one for sale!
Here's what Stereophile had to say about the K&K (note that the kit now sells for $325 and the assembled version sells for $385):
The Auditorium 23 Hommage T1 sounded bigger, and the Audio Note AN-S8 sounder clearer, more present, more colorful. The Shindo Masseto's built-in trannie had a shade more texture and a more natural sense of flow, and the Auditorium 23 Standard had more character and drama. Yet the K&K never sounded deficient in any of those ways: It just sounded musical—to such a degree that, whenever I used it to play the records I love, I was able to forget about sound altogether and simply lose myself in the music.
The K&K's bass was strong enough for my tastes, and nicely detailed. It played music in a perfectly tuneful manner, with good timing and a fine, natural sense of note-to-note flow. It was neither colored nor congested. And it didn't hum. Most of all, the K&K costs only $275 and a few hours of assembly time: That really is remarkable.