Marantz CD63 & CD67 mods list - Page 1817 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

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

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 13th May 2012, 05:07 PM   #18161
diyAudio Member
 
Join Date: Sep 2009
Quote:
Originally Posted by UV101 View Post
Your blue lines are connected to the wrong end of the links (need to closest to the opamps) you removed but other than that it's fine. Personally, I would not remove the muting to start but it's very easy to remove the headphones feed as you describe. To be honest, unless you replace some caps in the psu and local decoupling to the dac and opamp then change to opamps to lm4562 or similar, you will make it sound worse by just bypassing the hdam.
Thanks for looking at the 1st diagram, I have included a 2nd update, is this what you mean??

Quote:
Originally Posted by Ben Hanke View Post
Minor tweaks like removing headphones and swappng the mains cord will not prep the players for HDAM bypass. I would do op-amps, filter caps and seriously beef up PSU caps first.
Thanks for the tips. I'm only 100 posts in the thread, more tonight!! I'll leave the HDAM alone then but at least I can now do it. I'll probably have a better understanding of which op-amps, filter-caps and PSU caps when I get further into the thread. There seems to be some many suggestions it's extremely difficult to keep up!
Attached Images
File Type: jpg hdam bypass.jpg (586.7 KB, 273 views)
  Reply With Quote
Old 13th May 2012, 05:21 PM   #18162
diyAudio Member
 
Malefoda's Avatar
 
Join Date: Jun 2006
Send a message via MSN to Malefoda
If that can help, don't remeber for wich player I've done it but here it is.
Note that it's for HDAM and OEM's caps bypass, parts removed as you did on your drawing.
http://img194.imageshack.us/img194/6784/image3icn.png
__________________
QED T260, Thorens TD-318, Marantz CD-43, TK2050, JBL 4313B & MJK's OB: music!
  Reply With Quote
Old 13th May 2012, 06:36 PM   #18163
diyAudio Member
 
Join Date: Sep 2009
Quote:
Originally Posted by Malefoda View Post
If that can help, don't remeber for wich player I've done it but here it is.
Note that it's for HDAM and OEM's caps bypass, parts removed as you did on your drawing.
http://img194.imageshack.us/img194/6784/image3icn.png
Thanks very much for your help.
  Reply With Quote
Old 16th May 2012, 02:45 PM   #18164
diyAudio Member
 
Ben Hanke's Avatar
 
Join Date: Dec 2007
Location: Vancouver, BC
Send a message via MSN to Ben Hanke Send a message via Skype™ to Ben Hanke
Hi guys, I'm looking for a nice (free) tweak to do next while I wait to get DOS parts. Does the following make sense?

I currently have 2 transformers in my player: a 50VA 2x12v that buzzes very slightly in proportion to the load, and a 30VA 2x15v for the output section that is absolutely fine. I bought a display tx but it was DOA.

My driver ICs are currently regulated to 9v with 7809/7909s fitted to the rails in place of the dropping resistors.

I'd like to:

1. Bring my display back
2. Raise my drivers to 12v
3. Minimize the noise from that slightly buzzing transformer if possible

In my box of bits, I have:

- Original KI transformer
- 3x 7812
- 3x 7912
- A rectifier diode bridge
- 4x Elna "For Audio" 56v 12,000uF caps
- 6x Black Gate 16v 220uF
- Veroboard

Can I do the following:

- Disconnect the 50va transformer secondaries
- Reconnect the original KI transformer to all pads except the ones fed by the 30VA 2x15v output transformer (assuming it fits!)
- Build a dual regulated power supply on the veroboard with 3x12v regs in parallel per rail
- Remove the existing 9v driver regs, isolating the ICs
- Wire directly to the pins of the driver ICs with the 6 Black Gates on local decoupling duties (to the top screen?)

Can someone sanity check that for me? I'm hoping that either the buzzing from the transformer is caused by the way it's currently connected and that would go away in the new configuration.

Cheers,

Ben
__________________
Modified Marantz CD63KI -> Modified PM66KI -> B&W 805S
  Reply With Quote
Old 16th May 2012, 03:45 PM   #18165
Thomo is offline Thomo  United Kingdom
diyAudio Member
 
Thomo's Avatar
 
Join Date: Nov 2006
If it's the buzzing that annoys, try swapping round the secondaries, one at a time on the 50va. This sometimes can stop toroidals buzzing. But don't ask me why cos I can't remember.

Lee.
__________________
/\/\/\/\/\/\/\/
  Reply With Quote
Old 16th May 2012, 04:34 PM   #18166
diyAudio Member
 
Ben Hanke's Avatar
 
Join Date: Dec 2007
Location: Vancouver, BC
Send a message via MSN to Ben Hanke Send a message via Skype™ to Ben Hanke
Thanks, I already tried that and it seemed to make no difference. I'd also like to get my display back if I can while also getting my servo towards a more 'final' solution. I figured if I can get them running off an OK supply board from bits I have then I can swap another one in later using better components.
__________________
Modified Marantz CD63KI -> Modified PM66KI -> B&W 805S
  Reply With Quote
Old 16th May 2012, 04:47 PM   #18167
Thomo is offline Thomo  United Kingdom
diyAudio Member
 
Thomo's Avatar
 
Join Date: Nov 2006
Fair enough Ben, I remember that I tried it before after some advice but it also made no difference.

Why not connect the KI TX in, but use its servo windings for other psu's such as the dac or clocks? Your 50va tx will be miles better than the original windings for servo duties.

The more separate supplies you add in, will relieve that 50va of more and more load and the buzzing should go away.

Lee.
__________________
/\/\/\/\/\/\/\/
  Reply With Quote
Old 16th May 2012, 04:58 PM   #18168
diyAudio Member
 
Ben Hanke's Avatar
 
Join Date: Dec 2007
Location: Vancouver, BC
Send a message via MSN to Ben Hanke Send a message via Skype™ to Ben Hanke
Thanks Lee - yes, I was thinking of making the 50VA tx dedicated to feed just the servo drivers and put the original KI windings back in for the 5v supplies for now. The output secondaries would not be used, so I guess I could use them for something else - that's a good idea.
Ben
__________________
Modified Marantz CD63KI -> Modified PM66KI -> B&W 805S
  Reply With Quote
Old 16th May 2012, 07:18 PM   #18169
Thomo is offline Thomo  United Kingdom
diyAudio Member
 
Thomo's Avatar
 
Join Date: Nov 2006
Definitely worth doing Ben. That driver ic psu upgrade won't be totally evident until everything else is isolated from it. I'd definitely concentrate on splitting off the rails as much as possible before worrying about the output stage. Many more gains are made by doing that than by adding a better output stage imho (as long as you have good opamps).

My cd63 is currently only a transport outputting spdif to my modded chinese dac. I currently have separate low-noise regs for pretty much everything. Every time I add in another psu or reg I can clearly hear the improvement, even through the dac which is not the ultimate in quality.

Sorry if I'm prattling on, I have no idea how much you've done and have missed large chunks of this thread recently.

Lee.
__________________
/\/\/\/\/\/\/\/
  Reply With Quote
Old 16th May 2012, 07:20 PM   #18170
Thomo is offline Thomo  United Kingdom
diyAudio Member
 
Thomo's Avatar
 
Join Date: Nov 2006
Oh, I wouldn't use those Black Gates as decoupling for the driver IC's. Rubycon ZLG are fine for that, and lets you use the BG's somewhere else

Lee.
__________________
/\/\/\/\/\/\/\/
  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 06:49 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