Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Salas DCG3 preamp (line & headphone)
Salas DCG3 preamp (line & headphone)
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 16th April 2019, 02:35 PM   #3771
Brakspear75 is offline Brakspear75  United Kingdom
diyAudio Member
 
Join Date: Oct 2014
Connect the primary to mains and use a voltmeter to check you've got 18V ac on each of the secondaries. Power off, hook two secondary wires together to give a centre tap, I'd guess one red, one black. Power up & verify 18V from centre tap to either end. Now check voltage from one end to the other - if the secondaries are in phase you'll have 36V, if the voltage is nowhere near that then swap the wires on one secondary only so the opposite colour is tied to form the centre tap. Recheck voltages to confirm 18V from centre to either end & 36V end to end. Done.



Or wait for a reply from someone who's used these transformers already ��
  Reply With Quote
Old 16th April 2019, 02:43 PM   #3772
killie99 is offline killie99
diyAudio Member
 
Join Date: May 2011
Thanks Brakspear, yes that seems the sensible thing to do rather than relying on the bits of sticky tape. Wonder why Toriody don't use different coloured wires like everyone else?
  Reply With Quote
Old 18th April 2019, 10:18 AM   #3773
transcendent is offline transcendent
diyAudio Member
 
Join Date: Aug 2018
While this is not a digital line level part of the forum, I wanted to ask what DAC's everyone has been using (if using) in combination with DCG3 preamp.

I've read few positive posts about Soekris DAC. Any opinions on it?
  Reply With Quote
Old 18th April 2019, 10:33 AM   #3774
killie99 is offline killie99
diyAudio Member
 
Join Date: May 2011
So the DCSTB I've bought has the wrong value resistors in locations R1 and R2, 1 ohm resistors are fitted rather than 33.2 ohm Dales (also had some of the transistors in the wrong places but thankfully has never been powered up).
I have some CFR25 Carbon Film 33Ω ±5% 0.33W -1200 → 0ppm/°C, are these suitable to be used instead of the Dales for R1 and R2?
  Reply With Quote
Old 18th April 2019, 11:11 AM   #3775
dewdrop is offline dewdrop  Singapore
diyAudio Member
 
Join Date: Mar 2004
Location: Singapore
Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by transcendent View Post
While this is not a digital line level part of the forum, I wanted to ask what DAC's everyone has been using (if using) in combination with DCG3 preamp.

I've read few positive posts about Soekris DAC. Any opinions on it?


I have a Soekris 1121 playing through the DCG3. All the power supplies are using UBiB v1.3, 7 in total. You won’t be disappointed.
__________________
Ed
  Reply With Quote
Old 18th April 2019, 11:46 AM   #3776
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by killie99 View Post
So the DCSTB I've bought has the wrong value resistors in locations R1 and R2, 1 ohm resistors are fitted rather than 33.2 ohm Dales (also had some of the transistors in the wrong places but thankfully has never been powered up).
I have some CFR25 Carbon Film 33Ω ±5% 0.33W -1200 → 0ppm/°C, are these suitable to be used instead of the Dales for R1 and R2?
Uninspiring ppm spec but since that is a constant current position that will bring them to more or less constant working temp you may use them.
  Reply With Quote
Old 18th April 2019, 01:47 PM   #3777
transcendent is offline transcendent
diyAudio Member
 
Join Date: Aug 2018
Quote:
Originally Posted by dewdrop View Post
I have a Soekris 1121 playing through the DCG3. All the power supplies are using UBiB v1.3, 7 in total. You won’t be disappointed.
Thanks dewdrop for the feedback ! What did you use for USB to I2S module?
  Reply With Quote
Old 18th April 2019, 10:04 PM   #3778
steefdebruijn is offline steefdebruijn  Netherlands
diyAudio Member
 
Join Date: Oct 2016
Quote:
Originally Posted by killie99 View Post
Thanks Brakspear, yes that seems the sensible thing to do rather than relying on the bits of sticky tape. Wonder why Toriody don't use different coloured wires like everyone else?


With all the trafos I used from them the output wires were always coming out of the trafo in the same “winding order”, so with red1, red2, blue1, blue2 coming out the inner wires red2, blue1 should be the “center tap”. But measure as stated above to be absolutely sure.
  Reply With Quote
Old 20th April 2019, 01:11 AM   #3779
dewdrop is offline dewdrop  Singapore
diyAudio Member
 
Join Date: Mar 2004
Location: Singapore
Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by transcendent View Post
Thanks dewdrop for the feedback ! What did you use for USB to I2S module?


I use a Pi2B for direct I2S connection to the DAM 1121.
__________________
Ed
  Reply With Quote
Old 20th April 2019, 08:31 AM   #3780
killie99 is offline killie99
diyAudio Member
 
Join Date: May 2011
Quote:
Originally Posted by steefdebruijn View Post
With all the trafos I used from them the output wires were always coming out of the trafo in the same “winding order”, so with red1, red2, blue1, blue2 coming out the inner wires red2, blue1 should be the “center tap”. But measure as stated above to be absolutely sure.
Yes, that's how they are wired. thanks.
  Reply With Quote

Reply


Salas DCG3 preamp (line & headphone)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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: Pass VFET 2 essential+supplemental kit and Salas DCG3 kit 32y0 Swap Meet 3 16th April 2018 05:22 AM
FS : Salas DCG3 pinnocchio Swap Meet 2 9th January 2018 10:32 PM
FS: 2x Salas DCG3 and DCSTB complete kits bvtrinh Swap Meet 5 26th October 2017 11:29 PM
WTB Salas DCG3 pcb or kit savvas Swap Meet 0 8th February 2017 10:50 AM
Using a line preamp to drive headphone ginetto61 Solid State 25 6th May 2015 06:19 PM


New To Site? Need Help?

All times are GMT. The time now is 11:12 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki