'Thank you gentleman, your observations are quite astute. One radical suggestion has been to change the output coupling caps to teflon since oil caps can possess a certain forward sounding midrange. This, of course alters the intended sonic signature of the preamp. I'll continue to burn in the beast and see what gives. As stated in my post, this preamplifier has more air and top extension than several others I've had the opportunity to preview.
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.