@ brownsfan
The Aqua 274B was a transformation in my Modwright Marantz SA 8005 SACD Player with a 9.0 PS; it was like a DAC upgrade in comparison to Mullards, Create, Gold Lion, Tungsol and Philips which was my 2nd best sounding tube.
The Sophia 6SN7 Blue tubes were utilized in both my tube amp and tube pre-amp and sounded better than my Sylvania VT 231, Sylvania W, Sylvania WGTA, Slyvania Bad Boys, Chrome Domes, Ken Rads, RCA 5692, CV-181 and Raytheon VT-231 Gray Glass; better imaging, detail, deeper and wider sound stage with lower floor noise but it’s the musicality that draws you in...
Also, the Sophia Blue KT88 beats all of my back-ups with a much more refined presentation and pin-point placement of images with-in the soundstage with more vivid colors and life-like sound quality, it just sounds real; compared to Ruby, Golden Voice, KT88Z and Gold Lions.
These Sophia tubes just have everything to include dimensionality, clarity, richness and warmth without sounding slow, bloated or congested and at some point will fill the remaining 6SN7s positions in both amp and pre :)
Wig