the magazine I subscribe to uses your amp with a Copland cta 305 pre, and they swear by that combo. Good luck!
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Its own, CAT ultimate, placette active, EAR 864, Copland (older models).. to name a few. There are many others. It's a somewhat difficult load (choose a pre that matches well with a 25-30kOhm load) -- but other than that, it's the sound that matters. To state the obvious: try out a few pre's starting with its own.