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Old 8th September 2010, 04:23 PM   #121
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Quote:
Originally Posted by tube_man88 View Post
I have set R1 to 20R (33//47R) and Voltage at R22, 21,37,38 =4.1-4.2, and Voltage at anode 89-90V, B+=197, should this be ok, or need to drop R1 lower to increase B+ ?
everything was good, and enjoy the music and tell me feel!
Thanks!
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Old 9th September 2010, 12:05 AM   #122
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Hi,
Lots of people on this forum are building the DACEnd or the DACEnd 2 by Andrea Ciuffoli.
I read a lot about parts, upgrades and so on. But it is hard to find any results, reviews or comparisons of these DAC's on this forum.
My question is, are there already people on this forum who are using one of these DAC's in their Audio System, with good, bad or exellent results?
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Old 9th September 2010, 03:39 AM   #123
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Hi dirkveenstra!
you can see some link please:
http://www.diyaudio.com/forums/quanghao ... li-87.html
Post 862

http://www.diyaudio.com/forums/quanghao ... li-94.html
apelizzo post 934

http://www.diyaudio.com/forums/quanghao ... i-125.html
Post 1250 agithegreat

http://www.diyaudio.com/forums/quanghao ... i-140.html
Post 1394 -flocchini

http://www.diyaudio.com/forums/quanghao ... i-152.html
Post 1520 - ksnider1

http://www.diyaudio.com/forums/quanghao ... i-154.html
post 1539-Yunick

Thanks!
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Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 9th September 2010, 03:42 AM   #124
Strosek is offline Strosek  Canada
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Quote:
Originally Posted by dirkveenstra View Post
Hi,
Lots of people on this forum are building the DACEnd or the DACEnd 2 by Andrea Ciuffoli.
I read a lot about parts, upgrades and so on. But it is hard to find any results, reviews or comparisons of these DAC's on this forum.
My question is, are there already people on this forum who are using one of these DAC's in their Audio System, with good, bad or exellent results?
I'm just waiting for Bud P to get back to me with transformers and I'll get this up and running in no time

All things being equal this DAC should sound fantastic the way it's implemented

I'll let you know!
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Old 9th September 2010, 05:30 AM   #125
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Quote:
Originally Posted by quanghao View Post
No!
R1 set current for SSHV Supply =22 Ohm, Ia ( I total ~95-100 mA)
So Iv need total= 80mA, 1/2 Triode 6h30 need 18-20mA.( the sound is the most )

And Voltage at Anode =90-100V,

So voltage at R 22, 21,37,38 =3.8-4V , and R =200-220 Ohm, it is ok!
Thanks

You see it???
Ok I got the correct anode voltage 90V now. So the current through each triode is 2x20mA ~40-50mA, power on 6 anode resistors //18K total=3k, is IxIxR abt 7.5W and per anode resitor 7.5/6 ~1.25W less than the 2W rating, but resistors are quite hot, is this ok ? Also the 22R 2W dropper resistors R15/R31 are also quite hot.
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Old 9th September 2010, 05:41 AM   #126
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You use 20ma for 1/2 tube, that is fine for the sound!
3k x 0.04 x 0.04 = 4.8W, so 6 x 2w = 12W, that is ok, no problem!
if you do not feel you can add a resistor 18k again, and down + B to 195V

And always keep 40ma for one tube and Anode 90V.

Can you tell me the sound it?? thanks!
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Old 9th September 2010, 06:15 AM   #127
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This image, you can see IV stage
Attached Images
File Type: jpg 5.jpg (448.2 KB, 515 views)
File Type: jpg 6.jpg (312.5 KB, 490 views)
File Type: jpg 3.jpg (458.1 KB, 486 views)
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update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html

Last edited by quanghao; 9th September 2010 at 06:17 AM.
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Old 9th September 2010, 08:44 AM   #128
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Join Date: Feb 2007
Location: groningen
Quote:
Originally Posted by quanghao View Post
Hi dirkveenstra!
you can see some link please:
http://www.diyaudio.com/forums/quanghao ... li-87.html
Post 862

http://www.diyaudio.com/forums/quanghao ... li-94.html
apelizzo post 934

http://www.diyaudio.com/forums/quanghao ... i-125.html
Post 1250 agithegreat

http://www.diyaudio.com/forums/quanghao ... i-140.html
Post 1394 -flocchini

http://www.diyaudio.com/forums/quanghao ... i-152.html
Post 1520 - ksnider1

http://www.diyaudio.com/forums/quanghao ... i-154.html
post 1539-Yunick

Thanks!
Thank you very much for your info, I will read these posts.
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Old 9th September 2010, 08:57 AM   #129
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Join Date: Feb 2007
Location: groningen
Quote:
Originally Posted by Strosek View Post
I'm just waiting for Bud P to get back to me with transformers and I'll get this up and running in no time

All things being equal this DAC should sound fantastic the way it's implemented

I'll let you know!

Nice, I'm very interested in your opinion.
I'm just started with this project, it can take some time, because work is also important.
I'm building the DACEnd (not the DACEnd2)
You will hear from me when my DAC is running.
Do you use the 'Andrea Ciuffoli' PSU layout in your system?
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Old 9th September 2010, 10:10 AM   #130
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Quote:
Originally Posted by dirkveenstra View Post
Nice, I'm very interested in your opinion.
I'm just started with this project, it can take some time, because work is also important.
I'm building the DACEnd (not the DACEnd2)
You will hear from me when my DAC is running.
Do you use the 'Andrea Ciuffoli' PSU layout in your system?
Not DAC-ASH is like DAC-END 2, because I use all Salas shunt for this project!

Yes!
you can see some layout by me, with design by Andrea and Salas in my web:

Quanghao.com
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update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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