+1 @noromance
Have you rolled those 12AU7 s?
Try some Tungsram NOS 7DJ8 tubes in your BHK pre amp. I use them in my BHK Pre amp and BHK 250 power amp. In my system, the stock tubes sound thin; the Tungsram NOS 7DJ8 tubes sound "fuller" and more natural. I've tried other brand 7DJ8s - none of them sounded as good as Tungsram.