Digital Drive

How do FETs measure differently from bipolars?

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Feanor

A

In Reply to: RE: Depends of the DAC (??) posted by morricab on February 22, 2024 at 07:23:34

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

Follow Ups:

RE: How do FETs measure differently from bipolars? - 13th Duke of Wymbourne 19:34:16 02/25/24 (1)
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?
- RE: How do FETs measure differently from bipolars? - morricab 07:22:59 02/29/24 (0)
  Those examples are completely beside the point of an audio circuit... where human perception is involved it is a far fuzzier situation.
RE: How do FETs measure differently from bipolars? - mlsstl 12:49:37 02/24/24 (1)
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.
- https://www.head-fi.org/threads/schiit-happened-the-story-of (Open in New Window)
- Thanks for that, which I have seen before. Also ... - Feanor 04:24:12 02/26/24 (0)
  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
  - Bruno Putzeys: 'The F-Word' (Open in New Window)
RE: How do FETs measure differently from bipolars? - morricab 11:28:45 02/24/24 (0)
They have different transfer functions.

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