AC – my personal preference in some systems is that 242 does not work. In some systems it sounds better than anything possible. Special 45s and PX25 have never reached those heights.
Audiophile Bill and dctom will validate, Christoph heard them sound right once when I posted them over to him he will say the same thing, he owns both special 45 and PX25.
There is another guy not on the forum who loves the 242 over the PX25 and 45s for the same reason. The Aries Cerat 40k did better than the special 45ed Lampi, not better than the 242ed Lampi, same system.
Again – what you are trying to classify as a system preference is a gain match.
Since you have 242 and special 45s, just get the PX25, but try in both your systems. As the gains are different, you might be surprised by the differences across systems
Shun mook, fuses, and cables are independent of all this and can continue to play their effects, as will external streamers. Your Lampi without being optimised for 242 will run at a lesser level. I said this regarding the Elrog 300 a year ago
Hearing it in “your own system” does not work in this case, because if you do not know the highs that can be achieved due to a gain mismatch in your system, you will not know what to tune your dac for. Dctom, when he sent his dac back, asked for it to be tuned to this gain, like Bill and I did. If I had not heard this in another system, I would not know what to ask Lukasz to set my dac for.