A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 26 - diyAudio
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Old 27th March 2013, 09:06 AM   #251
Almeg69 is offline Almeg69  United Kingdom
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Has anyone tried out different IV resistors. Would it be worth trying the Audio Note non magnetic type ?
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Old 27th March 2013, 09:17 AM   #252
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Quote:
Has anyone tried out different IV resistors.
I haven't and I don't think I'll bother to try that until the rest of my system is up to scratch.
But forum member dvb-projekt was suprised with the improvement of the rhopoint over the Texas Components TX2575 Bulk Z-Foil resistor in his dac.
http://www.diyaudio.com/forums/blogs...-resistor.html
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Old 27th March 2013, 02:59 PM   #253
Almeg69 is offline Almeg69  United Kingdom
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Thanks for the link Bas, I have just ordered 8 off 2W non magnetic Audionote resistors to try ;-)
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Old 27th March 2013, 04:27 PM   #254
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Thanks for the link Bas, I have just ordered 8 off 2W non magnetic Audionote resistors to try ;-)
Am curious about your experiences.
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Old 27th March 2013, 05:25 PM   #255
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Quote:
Originally Posted by Almeg69 View Post
Has anyone tried out different IV resistors. Would it be worth trying the Audio Note non magnetic type ?
I have not tried it yet but I expect Tantalum resistors will be the best for this position.

In tube amps I use carbon film in series with the signal and tantalum to ground.

I will first try the sowters.

I have soldered in shunt regulators on the position of the 3.3v and 8v regulators, they are now burning in and I must say it is quite a big improvement in sound. I will report later with some pictures.

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Old 27th March 2013, 06:04 PM   #256
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Regarding output capacitors consider Jensen copper foil in oil. These come in two tastes: with aluminium cover and with paper cover. The latter one sounds better but is more expensive.

I have experiemted years ago with taking off the shrinkfoil of electrolytics and caps, this brings an audible improvement. This has to do with the foil being static and that influences the magnetic field of the capacitor, this magnetic field is generated by the AC currents running through a capacitor. If the magnetic field is influenced, it will also influence the currents; thus losing microdynamics.

The aluminum cover also has a similar effect. If you saw off this cover the sound will be MUCH better!
The oldest paper in oil capacitors that I have stripped are now around 8 years old and still measure and sound fantastic.

So this is my little "geheimtip"

Jensen has also discovered this, hence their more expensive line of caps with paper cover. Don't let them fool you.................

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Old 27th March 2013, 08:25 PM   #257
Tinco is offline Tinco  Netherlands
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Hey Supersufer,

Are you suggesting I peel the cover from the cap and somehow replace it with paper? That sounds a bit dangerous, I couldn't find a method on google, do you have an article explaining the process?
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Old 27th March 2013, 09:33 PM   #258
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Originally Posted by Tinco View Post
Hey Supersufer,

Are you suggesting I peel the cover from the cap and somehow replace it with paper? That sounds a bit dangerous, I couldn't find a method on google, do you have an article explaining the process?
No article, I tried it for myself. it is not dangerous, worst thing is you destroy the cap. I have been using peeled off caps in tube amps with a few hundred volts dc on them, though I would not recommend you to do that. The dac however only has 2.7volts dc out so that is harmless.

I use a small metal saw to saw the aluminium off and used some pliers. Most of the caps (depending on value) have some room between the actual capacitor and the aluminium cover. Some caps have a bit of lose oil in them, you can clean that off.

I also tried this with electrolythics but they dry out and lose their capacity, paper in oil capacitors are very easy to modify this way.

You can leave the capacitor open or cover it with a bit of carton and tape (no plastic tape of cource)
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Old 29th March 2013, 07:44 PM   #259
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Hi,

Here are some pictures:
-you can see the inside of the Jensen copper foil capacitors, some paper around and wooden covers.
-the complete arrangement with Alix board and custom short USB cable.
-The shunt regulators from Tentlabs for 8V and 3,3V, I had to remove some capacitors and the regulators. You can leave out the Wima because there is also one on the shunt. I still have to remove the electrolytics that are directly on the pins of the dac chip (the wima's will stay); this will give more speed/dynamics.

Next will be to mount the Sowters and two extra dac boards.
Attached Images
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File Type: jpg IMG_5923.jpg (1.02 MB, 915 views)
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Old 29th March 2013, 11:46 PM   #260
Tinco is offline Tinco  Netherlands
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Hey supersurfer!

You don't mess around, those pictures look awesome
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