My only experience with the Einstein OTL's has been at the show on Acapella speakers. In that set up, they are extremely resolving, transparent and seem to have more than enough power to drive the speakers. As you might expect, the amps sound similar to the preamp. As with any other OTL, you must choose a speaker that has the proper efficiency and resistance to interface best with these amps. Closest sonically are the discontinued Tenors.
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