The Butlers have been well-reviewed (see extremely well-written 6moons.com review of TDB 2250), if that matters to you. I have my TDB 5150 coming any day now for my home theater rig.
Re Newbee's points, such matching isn't as critical w/the Butlers due to their high power and hybrid circuit (6SN7 driving a solid-state output stage, in a novel way well beyond my ability to describe).
Re Newbee's points, such matching isn't as critical w/the Butlers due to their high power and hybrid circuit (6SN7 driving a solid-state output stage, in a novel way well beyond my ability to describe).