PrimaLuna One, interconnects,cables,power chords

I have a hard time justifying spending a lot of money on cable, PC and I/C just to improve this amp's "sparkle and transparency" (not that you need my justification). One of its biggest attractions for me is it's price/performance ratio. What I would do is some tube rolling. You can change the sound of this amp quite a bit by changing the small tube's and power tubes. You can play with new production tubes on the cheap or NOS. Call Kevin Deal and discuss w/him your what you want to do and see what tubes he would recommend. I would agree that changing your speaker cable to Nordost might help the high end, I'm just not sure how it will effect the bass.

New Old Stock. Means that they are tubes that have not been used but are no longer in production. Unfortunately many tube sellers on the internet apply this designation to any old tube, used or not. Caveat emptor.

I put in some NOS Tesla E34L's (power tubes) built in the late 80's/early 90's, but I haven't tried similar vintage Tesla EL34's yet, but from past experience I suspect they would sound much the same. That brightened my One up quite a bit. Added to that some EI 12AX7's almost made it too bright and I went back to the EH's (this is the only application for the EH's that I found that they sounded neutral - go figure!). You can also play with the 12AU7's as well - they do make some difference. I ended up using EI's. The permutation's are endless. I didn't care for the JJ 12AX7's or the JJ 12AU7's in this amp at all.