Adhesiv,
The Os' are terrific speakers.
Here's my review on them. I currently use them with a pair of 300B mono blocks that are about 8-9 watts each. And while I am actively looking at a possible implementation involving some 211 tubes, which would put me up closer to 20-25 watts, I don't plan to get rid of my 300B amps. I love them, and they work well with low powered SET's!