OLD THREAD Hi-end phono preamplifier by Andrea Ciuffoli - Page 37 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Quanghao Audio Design

Quanghao Audio Design Quanghao Audio Design is a producer of DIY Audiophile Kits and PCB boards, selected from many listening tests!

Reply
 
Thread Tools Search this Thread
Old 14th March 2011, 11:50 AM   #361
diyAudio Member
 
Join Date: Aug 2008
Thumbs up Finally !

I don't post often here, but after much deliberation, I'm quite pleased with the completion of this D3A project !

I'm using the Broskie's Janus Regulator to power the phono stage for now. I began with Russian K75-10s bypassed with Teflon FT-1s. The bass sounded boomy. I had some AmpOhm Tinfoils PIOs for another project but I decided to try it out here. I'm must say, the caps sound good in this circuit. I finally upgraded one of the caps in the RIAA network to Russian Silver Micas.

I haven't had a chance to hook it to my turntable in my main system, but I've been testing using the iPhone thru the Hagerman's iRIAA. The phono stage sounds good across the frequency range, but I will only be able to do any sort of critical listening once I hook it to my vinyl rig.

B+ 193V with load
Click the image to open in full size.

K75-10 PIOs in coupling stage
Click the image to open in full size.

Playing Gotan Project from iPhone thru Hagerman's iRIAA
Click the image to open in full size.

AmpOhm TinFoil PIOS
Click the image to open in full size.

Russian Silver Mica in RIAA network
Click the image to open in full size.

I have a Hammond box that I am going to enclose the Phono Stage and connect it to the Janus via an umbilical. I also have the Salas Regulator that I plan on building and tieing all this together in a single chassis but that will have to wait. For now, I'm a happy camper !

Last but not the least, much thanks to Andrea and Quanghao for their good work !
  Reply With Quote
Old 16th March 2011, 06:53 AM   #362
diyAudio Member
 
tangmonster's Avatar
 
Join Date: Jul 2007
Location: Cape Town
COOL , glad too see there are other people posting pictures. mine have been doing lots of duty ,and still going strong.
  Reply With Quote
Old 16th March 2011, 10:16 AM   #363
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
Blog Entries: 2
Send a message via Yahoo to quanghao
[QUOTE=nikhilji;

You are doing great!
Congratulations!
Thanks
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
  Reply With Quote
Old 22nd March 2011, 09:52 PM   #364
diyAudio Member
 
Join Date: Mar 2005
Location: Glen Head, NY
Hello,
I tried to place a order on your web site today but was unable to complete the order . Web site said there were no shipping options to send the order to Glen Head ,NY USA. is this true or can I order the circuit boards. I also tried to order the PP amp boards.
Bob Adamo
  Reply With Quote
Old 25th March 2011, 04:28 PM   #365
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
Blog Entries: 2
Send a message via Yahoo to quanghao
Quote:
Originally Posted by boba1000 View Post
Hello,
I tried to place a order on your web site today but was unable to complete the order . Web site said there were no shipping options to send the order to Glen Head ,NY USA. is this true or can I order the circuit boards. I also tried to order the PP amp boards.
Bob Adamo
Hi! Have problem from my web??
quanghao.com
thanks your help!
Quanghao
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
  Reply With Quote
Old 5th April 2011, 11:57 PM   #366
toufu is offline toufu  United States
diyAudio Member
 
Join Date: Jun 2008
Location: San Francisco
Mine has been running great for a while now...
Attached Images
File Type: jpg DSC00163.JPG (133.1 KB, 197 views)
File Type: jpg DSC00164.JPG (143.0 KB, 197 views)
  Reply With Quote
Old 11th April 2011, 11:45 PM   #367
pred is offline pred  Switzerland
diyAudio Member
 
Join Date: Aug 2004
Location: Neuchatel
Hello,

I am starting to build mine, bit by bit, it will take time but I hope to come around it at the end.

Small questions for PSU:
- Could following replacements IRF840 -> IRF830?
- How big should be 33Ohm resistor to have only 10-20mA just for testing of the shunt?
- Are leds red, green...?
- Where to find 56k 5w?

Thank you in advance,
Pred
  Reply With Quote
Old 12th April 2011, 12:26 AM   #368
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
Blog Entries: 2
Send a message via Yahoo to quanghao
Quote:
Originally Posted by pred View Post
Hello,

I am starting to build mine, bit by bit, it will take time but I hope to come around it at the end.

Small questions for PSU:
- Could following replacements IRF840 -> IRF830?
- How big should be 33Ohm resistor to have only 10-20mA just for testing of the shunt?
- Are leds red, green...?
- Where to find 56k 5w?

Thank you in advance,
Pred
Hi ! Do you can see in circuit
Attached Images
File Type: jpg Cricuit-'Simpler-Simplistic.jpg (187.3 KB, 256 views)
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
  Reply With Quote
Old 12th April 2011, 06:27 AM   #369
pred is offline pred  Switzerland
diyAudio Member
 
Join Date: Aug 2004
Location: Neuchatel
Thank you for more precision,

btw, I do not see zeners in this schematics? Also what about IRF840, I have some IRF830 so I was wondering. I see I can use 47k 5W since we are under 300V? This is quite different, then what we have in your older post...

Regards,
Pred
  Reply With Quote
Old 13th April 2011, 11:34 PM   #370
pred is offline pred  Switzerland
diyAudio Member
 
Join Date: Aug 2004
Location: Neuchatel
Hello guys,

I must be blind. I started to populate the regulator board and do not see R12 bleeder resistor nowhere. Where is it?

Thanks,
Pred
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
OLD THREAD DAC End by Andrea Ciuffoli quanghao Quanghao Audio Design 2062 23rd May 2014 03:30 AM
Hi-end phono preamplifier quanghao Quanghao Audio Design 8 30th June 2010 03:37 AM
The DAC End 2 by Andrea Ciuffoli pcb + most parts... prooptiki Swap Meet 7 31st May 2010 02:21 AM
Custom designed transformer for Andrea Ciuffoli 6c33c OTL AMP.... zxcxz Tubes / Valves 2 10th July 2009 04:14 PM
Andrea Ciuffoli Mosfet Amp DieterD Solid State 16 24th December 2001 05:56 AM


New To Site? Need Help?

All times are GMT. The time now is 09:05 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2