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Old 9th June 2016, 11:49 PM   #4061
deadpool is offline deadpool  Australia
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Quote:
Originally Posted by Abartels1965 View Post
Hmm, yes, it's Voltage

guess I might be selling my UTC's A20 then
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Old 17th July 2016, 05:47 AM   #4062
deadpool is offline deadpool  Australia
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So I purchased a Dual AK4495SEQ board from Aliexpress, modified to run straight into my A20's the DAC has no problem at all driving the transformers just make sure the DC resistance is 1k ohm
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Old 17th July 2016, 09:03 AM   #4063
Abartels1965 is offline Abartels1965  Netherlands
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What kind of board did you buy? Spdif input or I2S?

Do you like it's SQ?
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Old 18th July 2016, 01:48 AM   #4064
deadpool is offline deadpool  Australia
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Originally Posted by Abartels1965 View Post
What kind of board did you buy? Spdif input or I2S?

Do you like it's SQ?
I bought this board

AK4495SEQ Dual Parallel Soft Control Board Assembled Support DOP DSD-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

and have just upgraded to a rasberrypie3 running Piecoreplayer to Hi-Fi Berry DIGI + to Tubleab SSE amp

so using SPDIF for the moment will be goin to I2S later
I started with the LME49720 it was a good upgrade...but I just love the sound of the UTC A20's connected to any DAC I don't now why maybe it suits my tube amp

Still more work to be done, boxing Rasberry3 etc
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Old 18th July 2016, 08:37 AM   #4065
Abartels1965 is offline Abartels1965  Netherlands
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Quote:
Originally Posted by deadpool View Post
I bought this board

AK4495SEQ Dual Parallel Soft Control Board Assembled Support DOP DSD-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

and have just upgraded to a rasberrypie3 running Piecoreplayer to Hi-Fi Berry DIGI + to Tubleab SSE amp

so using SPDIF for the moment will be goin to I2S later
I started with the LME49720 it was a good upgrade...but I just love the sound of the UTC A20's connected to any DAC I don't now why maybe it suits my tube amp

Still more work to be done, boxing Rasberry3 etc

I know this board, but didn't own or listen to it. Doesn't have I2S input, so you have to create it yourself.

There's something with those boards (and 99% of other AK4495 based boards, even very expensice AK449x based dac's,,,,) you can change to get a much better SQ, especially in low freq.

Article at Hifiduino:
https://hifiduino.wordpress.com/2014...rita-4490-dac/

You have to put bigger caps (in Parallel) between VREFHL/VREFLL and VREFHR/VREFLR Try at least 2200uF, or, if you can, 4700uF.
This really makes a big difference. Probably your design has 100uF only......

https://drive.google.com/file/d/0B5i...ew?usp=sharing

https://drive.google.com/file/d/0B5i...ew?usp=sharing

https://drive.google.com/file/d/0B5i...ew?usp=sharing

I based my MonsterDAC on AK4495SEQ too.
Here's the original version, with isolated XMOS USB input:

https://drive.google.com/file/d/0B5i...ew?usp=sharing

And this is final version:
With RPI3(PiCoreplayer) + Modified HifiBerry DAC+Pro(I2S) + Discrete Chinese Class-A FET output stage (all in 3M AB5100S+Copper shield)

https://drive.google.com/file/d/0B5i...ew?usp=sharing

How it sounds? Not to describe with words, it's just R E A L.
Next and final step would be to use FIFO reclock (from Ian Canada).
But product (HAT) is still in development.

Cheers

Alex

P.s. Sorry for the picture links, tried to put them straight on the site, but that didn't work, probably too big.....

Last edited by Abartels1965; 18th July 2016 at 08:48 AM.
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Old 27th July 2016, 02:35 PM   #4066
wendelltate is offline wendelltate  United States
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I am sure that everyone is tired of talking about this but....I bought the Lampucera DAC from Lawrence on ebay. I am really enjoying it so far. I didn't buy the tube stage for it but I am running it to my Fisher 400CX-2.

I have been emailing with Lawrence about this and he suggests the opamp upgrade to a dual channel HDAM which he sells. He said that it is highly suggested and will make a big difference.

Has anyone used this opamp upgrade? Is it noticeable?

Is there anything else that I need to do in the meantime? Maybe change the power supply to a toroidal?

Thanks in advance.
Wendell
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