For those of you who have the conditioner version of the Kaplan H.E Power Cord, I have an inexpensive tweak that you can try - replace the stock fuse with a cryo'd ceramic fuse from Lee at Cyroparts (http://www.cryo-parts.com/fuses.html).
I have tried this with the 3 amp conditioner cord and felt that there was an audible improvement.
The fuses are inexpensive (under $15 each) and Lee is a pleasure to deal with, so you really don't have much to lose.
George
Guys,
Had a senior moment last night, so need to make a quick correction.

I only replaced the fuse on the 3 amp conditioner cord. The 15 amp conditioner cord does not have a fuse.
I used a 3 amp, 1.25" (~32mm--"standard" size) deep cryogenically treated "slo-blow" 250v ceramic bodied fuse.
Again, sorry about the mistake.
George