Salas hotrodded blue DCB1 build - Page 153 - diyAudio
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Old 1st December 2011, 11:09 PM   #1521
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Quote:
Originally Posted by Salas View Post
I wrote higher linearity, more input capacitance, dissipation. A step forward and two nuisances. You pick.

I was not thinking about the 2sk369v, but the choice to choose 2sk170 around 7mA and not as high as possible.

D.

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Old 1st December 2011, 11:37 PM   #1522
Salas is offline Salas  Greece
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Originally Posted by Nick77 View Post
Another big thanks to Salas,Teabag,Blues and Ed.
You are welcome. A nice warm looking build you got.
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Old 10th December 2011, 01:59 PM   #1523
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If trying a balanced like John, Is there any reason why one PSU can't power both buffers?
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Old 10th December 2011, 02:08 PM   #1524
Tea-Bag is offline Tea-Bag  United States
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Originally Posted by buzzforb View Post
If trying a balanced like John, Is there any reason why one PSU can't power both buffers?
I've always rallied builders to do that. But I am cheap.
This is how I power my Phono pre.
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Old 10th December 2011, 03:05 PM   #1525
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I am cheap too, but the question is whether or not it offers any signficant improvement. I wouldn't think there is much to be gained, but looking for more experienced opinions. I am going to try his dual mono as well as a truly balanced version.
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Old 11th December 2011, 12:55 AM   #1526
bkdog is offline bkdog  Australia
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Quote:
Originally Posted by buzzforb View Post
I am cheap too, but the question is whether or not it offers any signficant improvement. I wouldn't think there is much to be gained, but looking for more experienced opinions. I am going to try his dual mono as well as a truly balanced version.
In my build, I used 2 separate buffer boards, hotrodded, for the main left and right balanced outputs. I also used another buffer board, not so hotrodded (did not have the thermal budget" inside the case) with the buffers driving L&R unbalanced outputs for a headphone amp, and powering another 4 buffers on perf-board for parallel balanced output to drive subwoofers.

Comparing the 2 sets of balanced outputs driving some full-range monitors, there is a fair difference in sound between the heavily hotrodded main outputs with dedicated PSU per channel, and the other outs which share a not-so-hotrodded PSU. The main outs are more detailed, smoother, more dynamic and with a bigger "space". The parallel sub outs do not sound bad (fine for a subwoofer), but I would say in comparison the the main outs the sound is more constricted, a little less smooth and with a slight loss of detail. This was a single blind test with 4 listeners. Not exactly scientific, but I was surprised at the level of difference. Take it for what it's worth, possibly not much, but it's what happened with my build.

Cheers,
bk
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Old 11th December 2011, 01:23 AM   #1527
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Thank you for the comment. I wish the standalone PSU was also "hotrodded", so that we could eliminate that as a possible contribution to the different sound. It makes sense that individual PSU's for the dual mono might sound better.
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Old 11th December 2011, 01:37 AM   #1528
bkdog is offline bkdog  Australia
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You're very welcome, as I said it's not exactly what you wanted, however I'm not surprised that the hotrodded PSUs sound significantly better (ie I think that makes sense, probably lower output impedance), and I also think that separate PSUs will offer slightly less crosstalk - this might be audible, I doubt it but I've been wrong before... And whatever tests I do are dependent on the rest of the system and my (or the listeners) ears, it may well not translate to your system, situation and ears... For the record, the hotrodded PSUs are running at about 40-45 degrees C on the heat sinks and the not-so-hotrodded is running at about 30 degrees C - it's not *so* different.
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Old 12th December 2011, 07:13 AM   #1529
Porfido is offline Porfido  Italy
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Hi guys!
Is in your opinion a 12-0-12v 100va CT transformer suitable for the 600ma bias?
Better finding a bigger one?
Thank you very much!
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Old 12th December 2011, 09:32 AM   #1530
AndrewT is offline AndrewT  Scotland
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600mA @ what voltage?
How many channels of 600mA?
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