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

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

I started my new Tube DAC
I started my new Tube DAC
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 29th March 2005, 12:50 PM   #91
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
I started my new Tube DAC
This the completed bottom module. The big toroidal is the HV supply with electrostatic shield. Then, I modified the Tube section to accept 6N1P tube and the filament section of the transfo had not enough current for this tube. So I added an separate Hammond filament transfo. There also a small Hammond choke for the HV CLC filter. They are all mounted just under the HV supply, so the wires are kept to their minimum. The transfos are mounted using a bitumen and neoprene sandwich to reduce vibrations.

On the back we can see the AC input module with EMI filter and Power On switch.

On the front we can see the blue Power-On led and HV switch mounted inside the small 3/8 bar. There is also two small insulated standoffs used to connect both transfo L-N supply lines.
The wire clamps keep the wires nicely routed
Attached Images
File Type: jpg bottom module_completed_small.jpg (30.8 KB, 895 views)
  Reply With Quote
Old 29th March 2005, 01:47 PM   #92
gmarsh is offline gmarsh  Canada
diyAudio Member
 
gmarsh's Avatar
 
Join Date: Apr 2004
Location: Halifax, NS
Nice project!

Question though - who made that 4-layer PCB?

I'm about to order a 4-layer 16x10cm board for a headphone DAC project, and I was thinking of using a 'no touch' Sierra Proto Express board ($102 USD for two, +customs/shipping/etc)

If there's an inexpensive shop north of the border, I'd love to know about it...
  Reply With Quote
Old 30th March 2005, 03:21 AM   #93
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
I started my new Tube DAC
Sorry, I bought it directly from Guido Tent. Very nice PCB indeed.
  Reply With Quote
Old 30th March 2005, 03:04 PM   #94
pedro is offline pedro  Spain
diyAudio Member
 
Join Date: Feb 2003
Location: Cordoba (SPAIN)
Hi Algar!
Big congratulations!
You are a master.

Would you post the whole work when finished?
pedro
  Reply With Quote
Old 3rd May 2005, 06:04 PM   #95
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
I started my new Tube DAC
Default Finally some sound

After months of delays, I finally start to listen to some nice music coming from my Super DAC

I just completed the interconnection of all the PCB and the sound is superb.

The only part missing is the solid stage amp section. I'm planning to rework the class-A Op-amp as my NOS 1545 DAC using FET's biais. This is not really a big miss because I included mainly the solid state section to demonstrate the much superior tube section sound in the first place, and to do some experiment.

I also included the space to mount two small SMD diamond buffer pcb's to be able to install a volume control and be able to use the DAC without preamp if I wish. See this site for the detail on the diamond buffer. Thanks Pedro for this info:

http://home.swipnet.se/~w-50719/hifi/qrv05/index.html

I had to rework the tube section to have the tube mounted horizontally, so I can close the top cover. Here some details of the tube section assy. You can see the rectifier tube with a small heatsink on top and the filament 6.3V LM317 regulator mounted directly on the frame for heat dissipation.

The amp tube pass trought the central metal cross member that then act as a heatsink, see next post...
Attached Images
File Type: jpg tube section_small.jpg (39.4 KB, 670 views)
  Reply With Quote
Old 3rd May 2005, 06:11 PM   #96
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
I started my new Tube DAC
Here the amp tube mounting details from back to front of the case central spine. Some holes were drilled around the tube to help heat dissipation. Nitril rings help controlling microphony.
Attached Images
File Type: jpg amp tube details_small.jpg (19.0 KB, 615 views)
  Reply With Quote
Old 3rd May 2005, 06:13 PM   #97
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
I started my new Tube DAC
Here the complete front panel view with the two modules.
Attached Images
File Type: jpg front view_complete_small.jpg (37.7 KB, 633 views)
  Reply With Quote
Old 3rd May 2005, 06:15 PM   #98
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
I started my new Tube DAC
And the complete top view (without the op-amp section, the diamond buffer and volume pot (future options)).
Attached Images
File Type: jpg front view_complete_small.jpg (37.7 KB, 608 views)
  Reply With Quote
Old 3rd May 2005, 06:16 PM   #99
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
I started my new Tube DAC
And the complete top view without the op-amp section, and the future options of the diamond buffers and volume pot.

Remark the short lenght of real and low loss 75 ohms coax coming from the back routing the digital signal. It connects to a real 75 ohms panel mount coax union adapter.
Attached Images
File Type: jpg top_complete_small.jpg (50.1 KB, 715 views)
  Reply With Quote
Old 4th May 2005, 01:18 PM   #100
peranders is offline peranders  Sweden
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
I started my new Tube DAC
Quote:
Originally posted by pedro
Peranders has been totally helpful on teaching me how to adjust his buffer for this particular case (the tube dac).
Just in case some of you has got same problem than I, the "diamond buffer" solution is really a very good one.
Thanks a lot peranders
That's only the normal I.... .... Thanks!

From what I remember you have been the most difficult case in interfacing the buffer right. I'm glad we worked it out finally. Tube outputs are a bit special becasue their rather high output impedance.
__________________
/Per-Anders (my first name) or P-A as my friends call me
Group buy: DCT03 DC trap for big toroidal transformers. Sign up for interest HERE. 69 pcb's in order. 65 paid.
  Reply With Quote

Reply


I started my new Tube DACHide 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
help me get started Higbean Tubes / Valves 3 1st August 2007 03:09 AM
Getting started Mark245 Solid State 4 20th May 2006 08:05 AM
Getting started with tube preamps Redemption Tubes / Valves 10 4th January 2004 12:16 AM
And this is how it all started Peter Daniel Solid State 36 12th March 2003 10:27 PM
What got you started? Vivek Everything Else 15 7th August 2002 06:45 AM


New To Site? Need Help?

All times are GMT. The time now is 11:03 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki