The Lehmann Black Cube Linear.
German precision, without a soul. Often described as the closest to a straight wire that neither adds nor subtracts from the signal. People around here really despise this amp for its transparency, detail and transient speed coupled with zero emotion. I couple it to my K701 with a Bryston BDA-1 DAC (a reference studio dac) and I find it ruthlessly revealing (I personally love the combination). Also a great amp for evaluating all my headphones and their outright technical capability.
This is why I love audio equipment reviews - first review hit on Google describes the Lehmann Black Cube Linear as "Creamy-smooth" and "tube-like". Good times.