I tried several power cords, up to a thousand dollars, and couldn't find improvement so I kept the stock cord. However, I can highly recommend playing with the tubes.
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I'm using CJ ACT-2 MKII with Bmi Oceanic Statement power cord with wonderful!!! results, very expensive but it is easily the BEST! power cord that I'll have ever tried on my preamp. Also I'll recommend Electraglide Genghis Khan (if you can find one) and FIM Gold power cord's with excellent! results as well. Hope this help.
Clayeton, what power cord came with the 17LS? The reason I ask is that I tried several different PCs with my CT-6. The factory PC that came with the CT-6 had what CJ calls their hospital grade cord. At least I think that is what Lew Johnson told me they called it. It has a clear plug. When I switched to a Premier 16 the aftermarket cord I was using with the CT-6 automatically went into the 16. After seeing your original post a couple of weeks ago and remembering that several people on Agon have already commented that aftermarket cords did not make a difference on their CJ preamps, I plugged the CJ hospital grade cord back into my 16. Voila, the factory cord actually sounds much better, particularly in the mid to upper ranges. Moral of the story, dont discount the factory PC. If your 17LS did not come with the hospital grade cord, you may want to order one from CJ and try it on for size. I dont know the price of the cord, but it has to be cheaper than some of the crazy prices people (including me) are paying for aftermarket cords.
I've tried a various cords on both my 17LS and now
my CT-5. My two favorite cords were the BMI Hammerhead
MK3 and a Tek-Line Reference. The MK3 cord is harder to
find these day's and its more pricey than the Tek-Line cord
I believe Tek Line will let you demo the cord for 30 days so
you have nothing to lose.
>>I tried a Shunyata CX cord, which made the sound brighter and edgier.<<
>>The after market options typically add cost without any audible improvement. <<
Hmmm ... contra my experience on both counts.
Granted the stock 16-gauge cord that came with the ACT2 and Premier 140 was a nice cord, and lower end after market cords may or may not yield a benefit. If you go up the ladder I've yet to hear a Premier level CJ preamp that did not benefit from either a Shunyata PC or Hydra or both. YMMV