H-Cat P12B. This is the only solid state line stage that I can listen to. Fortunately, it is also better than any of the tube line stages that I have listened to.
I've not tried most, but going from the tubed CJ 17LS to the Ayre K1x was like a revalation. The Ayre preamp has brought out the most significant improvment I've ever made to any stereo system.
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