IIRC, the Odyssey has pretty low input impedance, may not be a good match for a tube pre. The Mccormack sensitivity can also be an issue. Really, the Bryston 4B-ST is a fine amp, don't overlook it.
If you can find a good used Musical Design D 140 or D 150B,would be an excellent choice to work very well with a tube preamp. Plus John Hillig is always available to answer whatever concerns you may have. These are some of the most musical power amps I have heard.
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