... which is still, 10 months after serial production, the only "offical" picture at soekris.dk as well as at the two web shops.
Thanks, SOEKRIS,
AS it turns out, excuse my posting before checking, the pad I lifted is a ground pad so I will simply use the other ground pad for both +- 5 volts supplies.
With the new boards not yet posted on the US site I was in a panic!
My board will work fine.
Thanks, again, for your help.
Take care,
AS it turns out, excuse my posting before checking, the pad I lifted is a ground pad so I will simply use the other ground pad for both +- 5 volts supplies.
With the new boards not yet posted on the US site I was in a panic!
My board will work fine.
Thanks, again, for your help.
Take care,
Hi soekris (and all),
i bought from you the number 464 (-02) and a second hand one (257-05) without the mods.
Please can you provide a picture with the mods and and list in what the parts was changed? I saw that some caps are changed and caps to resistors. I searched in this thread but i didn't found a pic/list of the mods.
My english is not good enough to understand all postings.
Many thanks!
i bought from you the number 464 (-02) and a second hand one (257-05) without the mods.
Please can you provide a picture with the mods and and list in what the parts was changed? I saw that some caps are changed and caps to resistors. I searched in this thread but i didn't found a pic/list of the mods.
My english is not good enough to understand all postings.
Many thanks!
I've misplaced my 0.01R resistors and had to use 0R for now in place of it. I also installed 0R where the compensation cap should be.
Installed capacitance is now at 4x680uF per rail (total 2720uF/rail 16 cap mod with Oscon SP 6.8V).
Already I can tell a ridiculous amount of difference vs the stock config with a single 680uF cap per rail. The music just seems to come to life, far less of that cold feeling. I don't know if its just subjective or not, but I listened to this dac for over a thousand hours at least and feel its now really let itself loose.
It's fun having a dac that you can get more and more out of as you get braver.
Is there any big issues using a 0R "resistor" instead of the recommend 0.1 or 0.01 I should take into consideration? Or is the capacitance value enough to reduce any noise issues?
Installed capacitance is now at 4x680uF per rail (total 2720uF/rail 16 cap mod with Oscon SP 6.8V).
Already I can tell a ridiculous amount of difference vs the stock config with a single 680uF cap per rail. The music just seems to come to life, far less of that cold feeling. I don't know if its just subjective or not, but I listened to this dac for over a thousand hours at least and feel its now really let itself loose.
It's fun having a dac that you can get more and more out of as you get braver.
Is there any big issues using a 0R "resistor" instead of the recommend 0.1 or 0.01 I should take into consideration? Or is the capacitance value enough to reduce any noise issues?
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When I install the new version, it put +10 gain and all the filters clip. In my opinion it is wrong amplify above 0 digital. Many people will say that the DAC saturated.
I like when I do not want to use volume control. to put a switch to set the default potenciomento the positive terminal to max gain. I can not to do now because it is a +10 and saturates.
I like when I do not want to use volume control. to put a switch to set the default potenciomento the positive terminal to max gain. I can not to do now because it is a +10 and saturates.
I'm now on FKP2 since 30 minutes. This is much more easily consumed. And yes some beaming in the upper midrange is gone. Stage larger but a little more fuzzy where the room ends. More bass. Did the cheap styroflex have anything on these... there was something exiting that I can't really put my finger on... lets listen for a few days on these now....
The cheap styroflex are probably for the explorative and curious...
The cheap styroflex are probably for the explorative and curious...
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Not the new boards. Any boards as long as you first are using an up to date filter. To improve further then add the vref mod.
They were used in the past in precision products and they were not cheap then. In fact they were amongst the most expensive caps then. Production has stopped many years ago, what you find now in current production are optical similar caps but with different dielectric. Mostly KP AFAIK. "Open" polystyrene/styroflex/KS caps have somewhat higher susceptibility to moist compared to other film type caps, for that reason the encapsulated types Siemens/Philips made are the best in that area. Too bad these often have diagonal pins which makes their use somewhat unpractical. Many have very low tolerance, 1 or 2.5% is no exception. These were ridiculously expensive and hard to find for DIY use. Soundwise I haven't found any objection using these, on the contrary. I still use them as I have many values in numbers in stock, even in large values which were not very common in their haydays. I guess their susceptibility for overheating them while soldering makes them unsuitable for the SMD form factors which possibly led to their demise. Let's be clear that their positive features outweigh their negative features. Please check facts with Google on polystyrene or Styroflex caps as they are called here. They have some really good properties.
In older japanese quality audio gear styroflex caps (made by japanese manufacturers) were used, especially the copper foil types that are sealed with resin are real gems.
The "open" silver colored types are at surplus level now which probably explains their current low pricing at some places (not everywhere !):
http://www.hificollective.co.uk/components/polystyrene.html.
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That's also my experience, before the vref mods my R2R DAC was sitting on the shelf. It couldn't compete against my ES9018 DAC.
Now with the vref mods (0.01ohm, +47uf, 0.68uf compensation cap) and 16x 680uf caps the DAC is completely transformed, it isn't sitting on the shelf anymore
Which filter are you using ?
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That's also my experience, before the vref mods my R2R DAC was sitting on the shelf. It couldn't compete against my ES9018 DAC.
Now with the vref mods (0.01ohm, +47uf, 0.68uf compensation cap) and 16x 680uf caps the DAC is completely transformed, it isn't sitting on the shelf anymore
Which filter are you using ?
Been switching between NewNOS and EQHQv5 from paul's v099 grab bag. Both sound just as impressive, favouring NewNOS again since the last mods.
Latest pics of my dam implementation. https://imgur.com/gallery/Bbp0z
can you post the pic of the mod?which caps have you used?That's also my experience, before the vref mods my R2R DAC was sitting on the shelf. It couldn't compete against my ES9018 DAC.
Now with the vref mods (0.01ohm, +47uf, 0.68uf compensation cap) and 16x 680uf caps the DAC is completely transformed, it isn't sitting on the shelf anymore
Which filter are you using ?
I just want to congratulate all the ones that successfully modified their DAM… when I opened the case where my DAM is sitting for the last 7 months; I was shocked on how small the components are. By just looking at the posted pictures it's difficult to realize.
That's the reason why I've ordered the latest rev.2 board with the vref already fixed. It arrived today (thanks Søren) and probably by the weekend it will be up and running.
Now the question, wouldn't it be interesting to compare the new version with the old one fully modded? I see a lot of persons displaying a Belgian flag down here… anyone living nearby Brussels with a fully modded ver.1 board interested in the comparison?
That's the reason why I've ordered the latest rev.2 board with the vref already fixed. It arrived today (thanks Søren) and probably by the weekend it will be up and running.
Now the question, wouldn't it be interesting to compare the new version with the old one fully modded? I see a lot of persons displaying a Belgian flag down here… anyone living nearby Brussels with a fully modded ver.1 board interested in the comparison?
That's also my experience, before the vref mods my R2R DAC was sitting on the shelf. It couldn't compete against my ES9018 DAC.
Now with the vref mods (0.01ohm, +47uf, 0.68uf compensation cap) and 16x 680uf caps the DAC is completely transformed, it isn't sitting on the shelf anymore
Which filter are you using ?
Are you using the 0.68uF cap in the feedback loop instead of a jumper?
Did you try the jumper and find you preferred using this cap?
TNT keep us informed on how FKP2's sound evolves. I was planning to use some russian 1200pf teflon caps based on Salas's post in http://www.diyaudio.com/forums/parts/168423-c0g-np0-coupling-caps.html but I guess I will just use the panasonic ECHU capacitors. I have them in 805 size. Do you think I will be able to replace the 603 original ones?
Will do. It seems this C has quite big impact on the audible result. But try also the teflon!
Ordered these to try:
| RS 470pF 1% 63 V dc Radial Through Hole Polystyrene Film Capacitor EXFS |
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Ordered these to try:
| RS 470pF 1% 63 V dc Radial Through Hole Polystyrene Film Capacitor EXFS |
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