caenlenfromOCN
1000+ Head-Fier
What tube amp? I'm using a Cavalli EHHA and Clarity Cap upgraded Bottlehead SEX with C4S. I don't think an amp will fix it though; if an amp "fixes" this headphone by taming the upper midrange, it must also tame the upper midrange for other headphones, which would make it fundamentally broken to me because that's the last thing many headphones, like the HD800, need.
Tubes offer a different sound signature in general... which is why people roll tubes so often, you may want to consider solid state if you don't want the actual music to be changed from what it was originally intended to sound like. My tube amp is in my sig.