I have the original Pacific, and yes, its sound varies depending on the output tubes. With 300Bs, it does sound quite romantic and lush, and with KR 242s, quite a bit more dynamic and neutral, and with 45s, PX25s, UX 301s etc., you get various shades in between. To me, the whole point of getting a Lampi DAC is that you are not getting one DAC, but many! You can tune the sound however you like. That’s the real breakthrough with Lampi DACs, more than any great technical breakthrough in terms of DSP etc. (IMHO), All that said, the very reason I’m sticking with the original Pacific is precisely because I do NOT want a hyper detailed DAC. I have already several state of the art solid state DACs that offer plenty of that kind of sound (Mola Mola, Chord, etc.). I specifically want warm, lush and full bodied sound with the Pacific, and I got that! No need for anything else, in my view….
I’ve said this before, and it‘s worth repeating. Since I have 5 separate systems in my house, which I do often hear quite a bit every week, the most impact on sound comes in decreasing order of importance: 1) Recording quality 2) Room 3) Speakers 4) Electronics (DAC etc.). To me, DACs matter, but really only a tiny bit. The huge impact of recording quality, room, and speakers dominates everything else.
When I listen to my Quad ESL 57s in a small room up close, vs. my Klipsch La Scalas in a much larger room sitting quite a bit back, no changing of DACs will ever make the La Scalas sound like the 57s or vice versa. Similarly, when I listen to my Harbeth Monitor 40.1s, or my Quad 2905s, the speaker presentation absolutely dominates. DAC changes are noticeable, but at a much lower level of importance. What hits you first and foremost is the speaker projecting the sound over the room. Where you sit in the room matters.
So, while I like my Pacific a heck of a lot, I have not much desire to move up the food chain because of these reasons. Just my biases!