I found my vt100 lacking in power to drive my vandersteen 3aSignatures. It could drive my virgo's fine. It would probably be cheaper to add a subwoofer, or go with a more efficient speaker. A big problem with large tube amps is they can be VERY expensive to retube. Some of the 150W+ audio research amps get into the 900-1200 range to retube. I don't think you can get away from the heat problem.
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