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Old 6th September 2011, 04:13 PM   #131
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Quote:
Originally Posted by dantwomey View Post
It would be interesting to see if Lundahl or Jensen had any transformers that would convert balanced to unbalanced without coloring the sound.

Regards,
Dan
Have you tried the Lundahl 1545a? I have two unused of those that I have not tried yet but will shortly if time allows me!
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Old 20th September 2011, 11:47 AM   #132
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Very interesting thread!


Peter, I have one question. Looking at the new circuit, it still uses only a single resistor as I/V conversion. Looking at different threats here I know that you have earlier tried different active I/V circuits

...are you conclusions that a simple resistor is better?

...if so, is that better on all parameters?

...any related experinces?

At the moment I am very satisfied with my passive version, but having considered building an active I/V stage I got interested in you evaluation!

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Old 22nd September 2011, 01:05 PM   #133
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Yes, it uses single resistor at the output and I'm not tempted to change things here.

We were experimenting with adding a simple Boberly buffer and it was effecting transparency. In a past I also tried Rudolf Broertjes I/V stage, and again, went back to single resistor. As they say, if it's not broken, why fixing it?
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Old 27th September 2011, 01:31 PM   #134
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Peter,
Would you be willing to share some info on your umbilical cables. I am considering using a similar system to tie the FE's from the BA amps to the output stage, keeping the FE in a seperate enclosure without any PS
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Old 28th September 2011, 01:56 AM   #135
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Those cables are not made by me. I wrote more about them here: The Phono Stage
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Old 5th October 2011, 03:37 AM   #136
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Quote:
Originally Posted by Peter Daniel View Post
Quite by accident I came across pictures of this system today, while browsing local audiophile club meetings: New Page 2
This is the older setup, from last October. You can still see there the TVC line stage I've built for him. The most recent picture in attachment. It's sort of a spy pic, that's why the quality isn't to my usual standards

This is the system when we (me, Marlen and George from Audio Oasis) do all the critical listening comparisons. While all technical aspects of the design come from me, those two other guys always contribute to the final voicing of the device.
BTW, That system, with the DAC, was recently used at TAVES and this is what they just wrote about it: Blueberry Hill Audio Rhapsody 3D | Stereophile.com
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Old 11th November 2011, 01:44 PM   #137
Skorpio is offline Skorpio  Denmark
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Quote:
Originally Posted by Peter Daniel View Post
Yes, it uses single resistor at the output and I'm not tempted to change things here.

We were experimenting with adding a simple Boberly buffer and it was effecting transparency. In a past I also tried Rudolf Broertjes I/V stage, and again, went back to single resistor. As they say, if it's not broken, why fixing it?
How about the "sin(x)/x" filter for correction the HF-response, have you tried it?
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Old 11th November 2011, 03:17 PM   #138
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FYI... Mouser now has BSP129's in stock again, if you wanted to try the 'Pushing the Limits' regulator.

Greg in Mississippi
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Old 11th November 2011, 03:29 PM   #139
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Quote:
Originally Posted by Skorpio View Post
How about the "sin(x)/x" filter for correction the HF-response, have you tried it?
Subjectively, HF response seems to be perfectly fine, so we didn't try any additional filtering.
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Old 27th November 2011, 10:46 AM   #140
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Originally Posted by Peter Daniel View Post
And what do I use? My main DAC does not feature such fancy enclosure, I actually tried to avoid enclosure completely and ended up with a board mounted to a piece of spruce block with two small panels to secure connectors and another one on top, holding everything together. I quite like it this way. We compared fully enclosed DAC to this one, and didn't observe any major differences.
Dear Peter. What is the cost of this object. I can see it's build with esoteric components some really difficult to come by. Can it be purchased like this from you?
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