what's the rest of the system? Could it be that the BAT pre has too much gain for your amp? Look at all the specs of this preamp and compare them to the specs of the other pres you had. Something is not right. There could be some midrange bloom since it's a tube unit, but it shouldn't be as excessive as you describe.
Extreme Midrange Bloom
Hello: I'm using a BAT VK52SE with the 6H30DR tubes recommended by several folks here on the Gon. I've noticed an extreme emphasis in the upper midrange frequencies which is somewhat unsettling and in fact causes an almost artificial honking presentation. Is this simply the BAT house sound or is there something I can do to resolve this anomaly? I've never experienced this in any other preamp I've owned in the past. I love the build and general fit and finish of this preamp. The user interface is excellent. An audio enthusiast friend suggested this could possibly be a result of the oil filled caps BAT is using. Any help would be most welcome since the pre is great in every other way. Accurate bass, sweet highs and a very unfortunate bloated midrange.