Questions on CD67/AD825 upgrade - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 9th September 2003, 12:28 AM   #1
diyAudio Member
Join Date: Feb 2002
Location: Canada
Default Questions on CD67/AD825 upgrade

I've decided to try LC Audio's AD825 opamp upgrade on my Marantz CD67SE and I'm not sure I have all the facts yet. I've determined that the 67 has the 16.9344 Mhz clock and two JRC 2114D opamps. Do the two separate opamps require two of their $39.95 modules? And, despite knowing that I need a 2114 replacement I'm still having trouble determining which one of their packages is the correct one. Type I or type III?

  Reply With Quote
Old 9th September 2003, 05:28 AM   #2
diyAudio Member
ashok's Avatar
Join Date: Jun 2002
Location: 3RS
Default AD825

I think the AD825 is a single op amp and the 2114 is a dual chip.
I removed the 2114 from my CD67 and put machined DIP sockets in its place. I first tried OPA2134 which was much better than the 2114. Recently I got the AD826 chip and tried that. It is even better than the OPA2134.

With a socket , you can plug in any chip you want provided they are dual opamps. The AD825 modules you plan to use are also available as 8 pin DIP compatible I think.
In any case somewhere on the forum I found some people prefering the sound of the AD826 to the 825. Much cheaper also. The 826 is less than US$3/- .
  Reply With Quote
Old 9th September 2003, 11:48 PM   #3
diyAudio Member
Join Date: Feb 2002
Location: Canada
LC Audio is promising "superchips" in a couple of weeks that will have "far better sound quality" than the AD825. I think I'll wait for the new stuff.

  Reply With Quote
Old 10th September 2003, 07:01 AM   #4
diyAudio Member
Join Date: Dec 2001
Default AD825 / AD827

Hello Dan,

you can find AD825 with a double module in France at or have ad827 dip 8 samples from analog device. The modules from selectronic can be use directely like a dip8. I have mounted this module on a philips CD723 and a Harman Kardon HD750 and the sound is beautifull. You can find informations on my site , choose Lec. CD rubric.

If you speak french you can participate of the french D.I.Y. Forum, choose Forum rubric or go directely to
all are welcome. You can speak english to if you want.

I saw that someone use opa2604 ( but I think that ad825 or ad827 are better.


Attached Images
File Type: jpg ad825.jpg (24.2 KB, 491 views)
  Reply With Quote
Old 7th December 2003, 11:10 AM   #5
diyAudio Member
Join Date: Dec 2003
Location: Sydney
Use AD826 and solder it directly on to the PCB. All IC sockets and daughterboards (for SM devices like AD825) will produce unwanted capacitance, which will seriously degrade sound at HF. Contact resistance between IC socket pins and IC pins will do the same, especially after a while...
  Reply With Quote


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
CDP (Micromega) DAC/output upgrade (newbie questions) R79 Digital Source 0 24th March 2005 07:50 PM
WTB: AD825 opamps Mark Hathaway Swap Meet 7 22nd May 2004 07:59 PM
Need some AD825's rbroer Parts 1 17th February 2004 09:37 AM
Marantz CD67/AD8065 upgrade goes 'well' dantwomey Digital Source 12 22nd November 2003 08:56 AM
decoupling AD825 jarthel Digital Source 0 18th June 2002 02:53 PM

New To Site? Need Help?

All times are GMT. The time now is 03:59 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2