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Old 30th May 2009, 09:08 AM   #611
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Quote:
Originally posted by McGyver
Now the setup is ready and singing. Really singing:

Hi

I got the same dac
would you please describe the mods you have done to get pleased results
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Old 30th May 2009, 09:42 AM   #612
McGyver is offline McGyver  Poland
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Yes, I would.

After CS4397 are Sowters. After Sowters are cathode followers.
When I got time I'll post drawing.
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Old 30th May 2009, 10:12 AM   #613
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thx

I will use audio transformers only - have you compared Sowters to other brands - Lundahl, Jensens, Neutrik, Edcore

regarding PS 5V - what regulator you are using

have you replace any components on dac board - resisors, caps
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Old 30th May 2009, 11:09 PM   #614
McGyver is offline McGyver  Poland
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I didn't compare various transformers yet. But I will do Lundahls.

I use LF50CV or LT1086 regulators.

There's no need to replace resistors IMHO, Dale are good enaugh. I replaced most of capacitors and used Rubycon MBZ, Nippon LXY, LXZ, Sanyo WG and Sanyo Oscon.
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Old 31st May 2009, 05:54 AM   #615
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my dac Is mini board with smd elements cs4397 and cs8416
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Old 31st May 2009, 12:12 PM   #616
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Default Power supply upgrades

Has anybody had any success tweaking the power supply on the DAC board, e.g.upgrading caps?
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Old 31st May 2009, 12:44 PM   #617
adamus is offline adamus  United Kingdom
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if you go down the tranformer route, a nice 5v low noise regulator will do the job. That will be my next mod.

Veru happy with the sowters in this dac, sounds super
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Old 31st May 2009, 07:34 PM   #618
brianco is offline brianco  Ireland
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I have this board - in its latest incarnation - and have for a start taken the signal from the chip ( cold side) and run it for a week or so. It was certainly impressive but today I soldered in on both hot and cold sides of each channel (between the board and the signal out plugs x2 300R (low inductance YAM resistors) on each wire in series with a small cap soldered between hot and cold at the joint between the resistors in each wire. Forms an H with the cap as crossbar!

Well the improvement in solidity and scale of the sound imagery is vast, the shrillness in the upper-mid range has gone and - other than I also believe that there is a cow with a better head of horns just over the next hill - somewhere in Kerry - I would be happy to live with the results!! BUT I have my eyes peeled for a pair of UTC transformers!!!

I am almost totally an analogue person but this has had me scratching at my old prejudices against digital...guess what!....No pain!
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Old 31st May 2009, 10:02 PM   #619
legarem is offline legarem  Canada
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Quote:
Originally posted by brianco
I have this board - in its latest incarnation - and have for a start taken the signal from the chip ( cold side) and run it for a week or so. It was certainly impressive but today I soldered in on both hot and cold sides of each channel (between the board and the signal out plugs x2 300R (low inductance YAM resistors) on each wire in series with a small cap soldered between hot and cold at the joint between the resistors in each wire. Forms an H with the cap as crossbar!

Well the improvement in solidity and scale of the sound imagery is vast, the shrillness in the upper-mid range has gone and - other than I also believe that there is a cow with a better head of horns just over the next hill - somewhere in Kerry - I would be happy to live with the results!! BUT I have my eyes peeled for a pair of UTC transformers!!!

I am almost totally an analogue person but this has had me scratching at my old prejudices against digital...guess what!....No pain!

What kind of transformers are you using ?
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Old 31st May 2009, 10:13 PM   #620
brianco is offline brianco  Ireland
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None...as yet.

Despite that the sound I am getting is on a par with pretty good analogue based on an SP 10, Zeta and original Kondo Audionote Io cartridge. I have altered nothiing on the board as yet.

The only real criticism is that on very loud massed orchestral work there is some congestion but that is down to my using my second string amplification which is very old, but good, Perregaux stuff which simply cannot handle the speed of the signal it is receiving.

I am, as I say above, looking for the UTC transformers which you seem to be very happy with....they are far and few between!
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