In Reply to: RE: Touche', sort of... posted by morricab on February 19, 2015 at 01:50:00:
You wrote, "Until you compare them to equally good no feedback circuits I can imagine you don't hear the consequences.."
Right you are. 15 or 20 years ago, I encountered the Atma-sphere amplifiers. Run with no NFB, these clearly were and still are superior to even the best Futterman type amplifiers in my experience. Now, whether my preference for a circlotron output stage with no NFB to a Futterman output stage with gobs of NFB has anything to do with NFB per se, we cannot know. However, I do prefer the circlotron types, in my system, to my ears. (Not wishing to criticize the Futterman topology which still also sounds pretty great.)
I think I asked this before, but maybe not: How can an SE OTL work with no NFB and still be able to drive a real world speaker with reasonably low distortion??? I guess the answer from the company you mentioned at the start of this thread is…. use a very large number of output tubes in parallel. That requires a very robust driver stage plus a gaggle of tubes that are at least fairly well to very well matched.
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Follow Ups
- "Until you compare them to equally good no feedback circuits I can imagine you don't hear the consequences.." - Lew 08:07:14 02/23/15 (8)
- RE: "Until you compare them to equally good no feedback circuits I can imagine you don't hear the consequences.." - morricab 11:59:26 02/23/15 (1)
- MOSFET - Lew 14:39:35 02/23/15 (0)
- RE: "Until you compare them to equally good no feedback circuits I can imagine you don't hear the consequences.." - Banat 11:17:30 02/23/15 (5)
- Triode outputs on a Futterman... - Lew 14:45:18 02/23/15 (4)
- RE: Triode outputs on a Futterman... - Banat 15:43:32 02/23/15 (3)
- RE: Triode outputs on a Futterman... - Lew 10:29:52 02/24/15 (2)
- RE: Triode outputs on a Futterman... - Ralph 08:50:47 02/25/15 (0)
- RE: Triode outputs on a Futterman... - Banat 15:54:52 02/24/15 (0)