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In Reply to: RE: Depends of the DAC (??) posted by Feanor on February 22, 2024 at 05:11:37
FETs, used more like triodes will also be able to preserve soundstage and imaging information. I just bought a Phasemation EA-220 phonostage, which is all SS. It is class A, all discrete JFETs with no added negative feedback. It sounds naturally warm and has good soundstage depth and imaging is pretty 3D...similar to a decent tube phonostage.
So, it probably measures a lot like a triode phonostage because the design concept is similar. It sounds natural, full, resolved and with good "visual" properties. Is it the best in these areas? No of course not as it is still an inexpensive product, relative to their own line and other high end gear that takes much more care with the power, circuitry and features (it has none...just MM and MC).
I have had some SS DACs that used discrete class A or literally just took the signal off the R2R chip and these, while not exactly tube like, are a far cry from the these SINAD wars DACs.
Follow Ups:
If they sound better in any way it's because of some measurable quality: what is that? (Because it's not magic.)
BTW, I'm no longer buying that negative feedback is a big bugaboo that must be avoidable at all costs.
Nothing you said so far has persuaded me that you aren't just another guy who likes tube-style distortions. Arcane technical explanations don't convince me otherwise.
Dmitri Shostakovich
They do measure differently (and depending how you use them) and morricab linked to an interesting paper somewhere in this thread about this topic.
The real question, though, is can those differences be perceived, and how, and is what is perceived as better actually better e.g. though those active devices sound nice in that topology in your listening room, would you really want them inside the airport radar that is guiding home your family from a trip or inside a medical imager looking for the source of that pain you keep having?
Those examples are completely beside the point of an audio circuit... where human perception is involved it is a far fuzzier situation.
Jason Stoddard (one of the founders of Schiit) has a good article on the subject on feedback in audio gain circuits (whether amp, preamp, or DAC, etc.) that he's posted on Head-Fi as part of his continuing series. Link below.
Bruno Putzeys' article, The F-word , see link below.
I can't penetrate all the technical info, but I've read it and understood what I've could.
Practically speaking I didn't need much more convincing than when I found my very-high feedback Purifi 1ET400A-based amp sounded better than my low-feedback Pass Labs X150.5 amp
Dmitri Shostakovich
They have different transfer functions.
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