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#11 | |
diyAudio Member
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#12 | |
diyAudio Member
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#13 |
diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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I personally have another I/V stage that does just that. It is called the Counterpoint III. It is not available to anybody but me at the moment, and it may not ever be. It is a DIY project I have taken on for myself.
It uses a folded cascode output with a common mode servo. Last edited by Russ White; 27th November 2012 at 01:19 PM. |
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#14 |
diyAudio Member
Join Date: Jul 2010
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really want my -3dB point to be closer to 2Hz, otherwise there is going to be phase shift within the audible bandwidth. Hence, good caps start getting pretty big and expensive. I have Mundorf Supremes (3.9uF) in my BII/Legato2 build right now.
Also, I wonder of some of the good listening experiences I have had with the Linn are due to the isolation factor of the transformers. I guess without trying them it is hard to say. But I am getting suspicious about RF on the output of DACs, and how this RF behaves in the input stages of some amplifiers. What line level transformers have you tried? From the published specs, some appear to be way better than others. |
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#15 |
diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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The Legato design itself with its LPF is already a good barrier to RF as long as it is wired sensibly .
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#16 |
diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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A a good 10uf cap is not hard to find.
![]() What impedance are you driving? |
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#17 | |
diyAudio Member
Join Date: Jul 2010
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Input impedance depends on the amp used, the lowest would be my Pass at 11K per phase. The 3.9uF caps I have now work pretty well with the Pass, but they are really big physically. |
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#18 |
diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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Honestly - IMO if you were going to use a transformer in that way - the best possible place to put it would be at the power amp.
I personally have never heard a transformer that did not add some color. Not saying it's good or bad. And I have heard quite a few. ![]() |
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#19 |
diyAudio Member
Join Date: Jul 2010
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Everything matters: I agree that a transformer will add its own signature, as will differing output wiring, or caps. From a technical perspective though, the measured distortion added is so minimal as to be inconsequential, and I still think there may be benefits: whether these are to taste/preference will be the question. So far, the two DACs which I have listened to quite a bit which used very nice Lundahl output transformers have both been among the best digital sources which I have ever heard, so, for me, I am not too worried about a good Lundahl (1684 amorphous or 1588 Mu metal) degrading the sound from what I have already heard.
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#20 |
diyAudio Member
Join Date: Nov 2007
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Russ: will the Counterpoint III be a discrete I/V? also, will this one be released as a product, or like the older ones just a few pcbs?
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