Sumo is Class A rated. Very warm and tube like. Definitely in the class of Threshold or Pass.
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I have an EX-442, which I use with a BAT VK-31 preamp and inefficient, 9-driver speakers from Fulton. The combination is warm and comes close to what I heard using the same equipment with a pair of Aleph 2s. I paid $450 for the EX-442 on Audiogon, and I consider the amp to be an excellent one at that price.
I also found that B&K's repair facility has fair prices. They repaired the amp for a nominal charge and shipped it back to me in a new box and with new packing materials.
I used to have a B+K EX442, it was a low hrs factory rebuilt when I got it. It was a very good amp indeed.
But when I later got a Threshold S/150 and a Forte Model6 along the way. I sold the EX442. It was a good amp but not in the same class as the others. Not sure how it would compare to the Smuo 9.