I have the Schiit Saga (original) and use it in tube buffer mode with all my sources except Audio Horizon phono preamp run passively.
I don’t presume to tell anyone what they hear, but after spending time rolling a few 6SN7’s with the Saga, I was able to choose a clear preference based on overall sound quality. I compared the stock tube with new issue Electro-Harmonix, Sylvania Chrome Top (not Chrome Dome), Melz 1578, and vintage RCA Grey Glass. This not only yielded a clear winner, but also a ranking: 1. RCA, 2. Melz, 3. EH, 4. Stock Tube, 5. Sylvania
Were these differences dramatic? Well no, but I’m listening for subtle cues and the best SQ based on different things, like transparency, timbre, highs, midrange, and bass reproduction.
“So while there were some noticeable gains in collective performance from a few candidates, the overall race was so close that only significant deficits in quality stuck out against the negligible.”
The quote above is from a “Double Blind” 6SN7 tube shootout using four Saga+ units. Check it out.
https://audio-head.com/double-blind-a-b-schiit-shootout-tubes/
There
was a clear consensus on rankings, which seems to indicate that the tube is
doing something. No?