UGS adventures - Page 98 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 25th January 2011, 07:29 PM   #971
generg is offline generg  Germany
dog dead, me alive
diyAudio Member
 
generg's Avatar
 
Join Date: Jul 2009
Location: Near Frankfurt
...............long live Dr. Kühnlein!
__________________
and the First Wtt is......a really First Class PSS Idea
  Reply With Quote
Old 25th July 2011, 05:39 PM   #972
nar is offline nar
diyAudio Member
 
nar's Avatar
 
Join Date: Apr 2002
Location: near the sea
Salut,

Hello,

My UGS is now a definitive prototype. Working out of the box

Many thanks to Mr PASS, many thanks to François,
many thanks to my friend Pierre without whom the build would never be possible,
and of course many thanks to the DIY audio community

Click on the pics to open them real size.

Build phase

Click the image to open in full size.

UGS module detail

Click the image to open in full size.

Overall view of the motherboard with the I/O assignment and signalisation

Click the image to open in full size.

Fine tuning of the output offsets, inputs shorted. Cold, 1mV; once idle temp is reached, +/- 0,002 mV worst case.
Temp. of the heatsinks : mild 38 - 39 celsius

Click the image to open in full size.

It's alive ....

Click the image to open in full size.

Gain setting : RIN 15K RFB 100K to get sufficient gain with my unbal sources.
The motherboard automatically shuts minus input bus to ground in case an unbal source is selected.

For sound quality, I should let it open more
but from the very first notes, I can say it's an impressive authority
combined with a live sense of details Very lively



nAr
__________________
"... Audio needs the thinnest wire ..." Rowan McCombe ... I hear it !!!
"Just 'cause they can't hear or sense it themselves doesn't mean you can't !" Allen Wright Allen was right ...
  Reply With Quote
Old 25th July 2011, 06:33 PM   #973
NYCOne is offline NYCOne  United States
diyAudio Member
 
Join Date: Jul 2010
Blog Entries: 1
Quote:
Originally Posted by nar View Post
Salut,

Hello,

My UGS is now a definitive prototype. Working out of the box

Many thanks to Mr PASS, many thanks to François,
many thanks to my friend Pierre without whom the build would never be possible,
and of course many thanks to the DIY audio community

Click on the pics to open them real size.

Build phase



UGS module detail



Overall view of the motherboard with the I/O assignment and signalisation



Fine tuning of the output offsets, inputs shorted. Cold, 1mV; once idle temp is reached, +/- 0,002 mV worst case.
Temp. of the heatsinks : mild 38 - 39 celsius



It's alive ....



Gain setting : RIN 15K RFB 100K to get sufficient gain with my unbal sources.
The motherboard automatically shuts minus input bus to ground in case an unbal source is selected.

For sound quality, I should let it open more
but from the very first notes, I can say it's an impressive authority
combined with a live sense of details Very lively



nAr

Very well done. What are you planning for a case?

I'm within a day or two of finishing my UGS preamp. I just have the power supplies and the UGS boards, not the whole preamp.

Did you use a JFET, a diode or a resistor on the optional spot of the power supply? I went with the resistor, I couldn't find a diode or JFET with the right current.

I also built a Borbely no feedback JFET preamp to compare head to head. I finished that last night. Spencer from these forums likes the Borbely better.
  Reply With Quote
Old 25th July 2011, 06:38 PM   #974
nar is offline nar
diyAudio Member
 
nar's Avatar
 
Join Date: Apr 2002
Location: near the sea
Quote:
Originally Posted by NYCOne View Post
Very well done. What are you planning for a case?
I will use my old one from ZLS one needs to move further It's hand made, all aluminum

Quote:
Originally Posted by NYCOne View Post
I'm within a day or two of finishing my UGS preamp. I just have the power supplies and the UGS boards, not the whole preamp.

Did you use a JFET, a diode or a resistor on the optional spot of the power supply? I went with the resistor, I couldn't find a diode or JFET with the right current.
I used a simple jfet. I used 2SK246Y grade from Selectronic. I just bought 10 of them, and could fine 2 pairs at about 2 - 2,4 mA

Quote:
Originally Posted by NYCOne View Post
I also built a Borbely no feedback JFET preamp to compare head to head. I finished that last night. Spencer from these forums likes the Borbely better.
I didn't build the Borbely, but for sure it's a nice topology. For now I will let the UGS burn-in

nAr
__________________
"... Audio needs the thinnest wire ..." Rowan McCombe ... I hear it !!!
"Just 'cause they can't hear or sense it themselves doesn't mean you can't !" Allen Wright Allen was right ...
  Reply With Quote
Old 30th July 2011, 05:00 PM   #975
NYCOne is offline NYCOne  United States
diyAudio Member
 
Join Date: Jul 2010
Blog Entries: 1
Default Last pieces

I'm a few soldering moments away from finishing my UGS preamp. I have gobs of 2SK170BL and 2SJ74BL. I'm going to use them in place of the 2SK389BL and 2SJ109BL. What Idss is proper?
  Reply With Quote
Old 30th July 2011, 05:09 PM   #976
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
BL



__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 30th July 2011, 05:25 PM   #977
NYCOne is offline NYCOne  United States
diyAudio Member
 
Join Date: Jul 2010
Blog Entries: 1
Quote:
Originally Posted by Zen Mod View Post
BL



yes. There's a big range in BL, is there a specific number that is recommended?
  Reply With Quote
Old 30th July 2011, 05:35 PM   #978
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
just say that anything between 6,5 and 10mA will do the job as intended
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 30th July 2011, 09:05 PM   #979
Tiroler is offline Tiroler  Austria
diyAudio Member
 
Tiroler's Avatar
 
Join Date: Jan 2010
Location: Austria
Good to read that some more fanatics have choosen this project. The UGS preamp is a very nicely and absolutely professionally developed and planned project, - thanks Francois! And thanks Manu for your support and encouragement! I have made my own boards, some were milled the rest was etched. Most stuffing and soldering is done already. Now I do the case and have started with the backplate. Here are a few pictures of my build.
Greetings to all, Martin
Attached Images
File Type: jpg UGS Set of Boards.jpg (108.3 KB, 259 views)
File Type: jpg UGS Milling Board.jpg (113.6 KB, 277 views)
File Type: jpg UGS Modules.jpg (85.7 KB, 324 views)
File Type: jpg Prepearing the Fets.jpg (102.3 KB, 314 views)
File Type: jpg Milling back plate.jpg (86.6 KB, 280 views)

Last edited by Tiroler; 30th July 2011 at 09:14 PM.
  Reply With Quote
Old 31st July 2011, 12:08 AM   #980
awpagan is offline awpagan  Australia
diyAudio Member
 
Join Date: Nov 2004
Location: sydney
Martin
Are you using mica insulators between the transistors and heatsinks?
__________________
Indecision makes the world gone round.
Maybe
  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



New To Site? Need Help?

All times are GMT. The time now is 09:25 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