PrimaLuna One, interconnects,cables,power chords

Could someone explain what NOS tubes are. I assume they are re-conditioned or something. I just am not sure what this means.

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 had some email exchanges with Kevin about tube rolling my PrimaLuna One. Seems the 12AX7 would have the biggest effect when changed but it depends on taste. Since I have no idea what 12AX7's out there do I haven't a clue where to start....any help in this regard is welcome also.

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.

Rthomer, I am using a Shunyata Diamondback PC with my Prologue Two. Power Cords, in my experience have yielded greater results in my system than those of speaker cables & interconnects. I'd recommend starting with upgrading the stock PC on the unit.

Running a dedicated line, terminated with a high-quality outlet is also a very worthwhile 'tweak' that yields great results! (especially for the small cost)