Modding the DirectStream DAC MKI

Thanks! Didn’t know I could use it with the DSII.

-Alan

Pulled the Trigger on a maxed out Farad Super 3,
SR Purple Fuse, Furutech inlet, with Level 2 silver cable.

Mattijs at Farad (great comms so far) will supply DC cable with GX16-4 to GX16-2 connectors.

Edcor 4400 transformers going in around the same time,
looking forward to hearing my “new” Dac. :slight_smile:

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Low and behold there is a useful piece to short the USB.

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Thanks much, great!

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Yep. I have the 12V.

-Alan

You probably can’t. I’m not going to lower the sound quality with components that make it easy to bypass parts of the power supply tree. Certainly, there’s no good place to hook in 12V on the analog card unless you skip some levels of regulation, and I don’t know why anyone would think that replacing quality regulation with a long wire is a good idea, no matter what’s on the other end of the wire. Modifying the power supply tree in the Mk II will be much more difficult than simply replacing the 12V supply in the DS Mk I. The Mk II doesn’t share anything but a handwaving version of the architecture with the Mk I. It isn’t simply better components here and there.

People should probably listen to the DS Mk II before deciding how to modify it, let alone whether various mods will be useful.

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Mk2 signature OK

Viborg USB2.0 Male Connector Type B Soldering, Hi-End 24K Gold Plated USB Rewireable Plug Connector with Alloy Cover for DIY (Type B)

Well stated…and, very exciting…

Can hardly wait for the DS-II to his the market…

Cheers.

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agree!! I updated to the edcor transformers, a while ago now, knowing the mk ii was a ways away but didn’t think it would be this long. All good things come to those who wait (my grandma’s favorite).

I’ll do the three dollar no holler part. And love it long time for that vs that 29 dollar gold plate.

Digikey has this.

I was looking at a bunch of the DIY. I like the Viborg strictly for the look of it. It’s not like there’s a line of people looking behind my cabinet, it’s just me. But, then again I am the most particular person in the line. :innocent:

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If it’s over $10K, I will be waiting even longer.

Nah… Shortly after a SOTA something or other comes out at $10,000, its available for 30-40% less on the used market when the well-heeled, early adopters move on to the next shiny new object.

Most of the “spendy”, want but don’t need, stuff in my dual purpose (Stereo & HT) bonus room are once (still to a certain extent) pricey items, which were gently used by fellow hobbyists.

Cheers.

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That’s what I meant. If it’s over $10K I will be waiting for gently used.

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Wow. Thanks Ted. Not sure how I got in the middle of this. You have to be careful reading and responding to posts. They can quickly lead you down a bad path. @adriaan I hope you are reading!

I do prefer one box with no mods necessary.

My point was merely if you spend $1K on a power supply for a DS1 you will probably have trouble selling it for a reasonable price when you buy a DSII.

Also, I have no idea about power regulation, rectifiers and trees, but I am happy they are in the DSII!

-Alan

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Update. Yesterday was a huge day. Friend DW brought several things over including expensive interconnect, AC cables, I2S cables, an amp, and DAC#1 back home. Also to pick up his new Abbas DAC. I’ll try to keep it brief :wink:

Big things:
DAC#2 cleaned house on all comers, quick and easy. I’m not surprised based on what I’m hearing. Reminds me a bit of Mike Tyson in the 80’s :wink: But the first time to officially go head to head in my own system vs several other very good DACs and with another very good listener present.

So am freshly inspired to get at least 1 unit out for sharing demo. I’ll try and finish up DAC#2 asap. It still needs another pair of OA fully enabled and update to Sunlight. Maybe some shielding work. Test, make sure all is well and it can go out I think.
It may go to friend DW first as he has promised the Dallas guys to demo some goodness soon. In return he will send me his stocker and I’ll work on converting it to DAC#2 specs for him.

DAC#1- It still sounds very good but we both agreed it should also be converted to DAC#2 spec now. Ie, we roll sans trafos on it. Many of the basics are already done and should be able to get that converted in a few days work basically. And then it can go out for demo rounds here, assuming some are still interested :slight_smile: Fair warning, there’s no going back…

Perhaps the biggest surprise for me was, the Audience Front Row interconnects. My gosh… I’m still buzzing from that. It was shocking how 1 pair in the system transformed things, even vs using really good AU24SX already… Ie how is that level of improvement even possible? Live and learn. Now the task is to acquire those too lol. My poor bank account. But as above, there’s no going back…

Other things:
I a heard slight clarity improvement using an expensive HDMI I2s cable. But I think what is possibly even better, we can look into adapting an RJ45 input socket to one of the existing HDMI I2S sockets. IME RJ45 generally sounds better (somehow). I’ve taken a cursory look at it and I think we could do it, if the will is there. Connecting electrically is no challenge really. Adapting the socket physically is the challenge, depending on cosmetic level required. T

Sample of DAC#2 playing with the air cores. Some piano chords and percussion:

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Please put me on the list for trial, Turbo! :smiley:

Hi Folks,
I’m working up the courage to perform the VCOM mod.
Which capacitor do you recommend?

Are these the most suitable?

Thanks!!!

If you’re going to use through hole electrolytics, try and use a larger value and smaller voltage rated, like 6v (to keep pkg size down). I’d do at least a 470uF then.

If you’re going to use SMD tantalums you’re limited to about 68uF or so in 0805 pkg size. 0805 will drop right in easy. Larger pkg size can get you larger value cap. All the way to 1000uF/4v rated for example. With a larger pkg size you’ll need to use a small jumper over to one of the leads then.

Even 47uF will make a nice improvement. But I have found meanwhile that even larger = more improvement. Sorry, I don’t know where the sweet spot might be. T