I'd think using a different type of 6SN7 tube would be a far better way of addressing bass emphasis than AC cords.
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Contact DCCA he can custom build you a cord that can do what you need. I believe that there is something wrong somewhere in your system that you will need to address. I believe that a power cord should not change the character of the sound just make it better. I have used DCCA power cords in the past to tune my system but now I have a different philosophy. I now put more emphasis on the equipment then the cabling. I found my self spending less on the equipment and more on the cabling in total spending more than if I would bought the right equipment in the first place. I do not by cheap cabling but good quality/value. I learned this from legendary people in the industry that when I went to their homes and I was shocked at how good their systems sounded and what they were not using for cabling. Just a side not for cheap you should buy several of the big spike kits from Parts Express and put some your equipment on the spikes. It's a cheap tweak and it tightens up the bass and it opens up the top end.
I would not expect the tonal effects of a power cord, if any, to be consistent or predictable from system to system. Especially when used on a preamp, which draws an essentially constant amount of current, and generates little if any rfi.
I would pursue a different approach, of which there are obviously many possibilities.
ESP Essence Reference does exactly that but in a good way. It tightens up the bass (chopping off fats ?) and also makes the bass very tuneful and rhythmic. In the process it does amazing PRAT with a very clean, articulate background/soundstage. I think you will love it. It has the same effects on every component of the chain.
I will not recommend this power cord for already neutral systems (all solid state) as it can make the sound bit too tight. Otherwise it is one fantastic PC.
I own an ultraverve and would suggest the VH Audio Flavor 2 for a good synergistic power cord. I have tried lot of cords with the Ultraverve and keep coming back to the Flavor 2. Also be aware that lots of gold ended cords can cause too much warmth in the bass in your system. So be sure to check your other cables and if they are all gold try brass.
Also the other suggestions about resonance control should be investigated as well. Good luck.