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.

Cambridge Audio 640C V2
Cambridge Audio 640C V2
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 25th August 2006, 05:43 AM   #1
wineds is offline wineds  Australia
diyAudio Member
Join Date: Apr 2006
Location: Melbourne
Default Cambridge Audio 640C V2

I have one of these CD players and I am very happy with it. Or at least I was unitl I pulled the lid off it last weekend. It is beautifully built inside with copper colored covers on the torriod and servo. The main PCB does contain a lot of average parts though - NE5532 for the filters (x6), 7815/7915 regs and cheap looking NP electo caps and filter caps in the PS. Seems like a lot of upgrade potential here. Anyone tried upgrading one yet?

Maybe OPA2134 for the filters, 2937/2990 for the regs and a sprinkling of Blackgates migth help?
  Reply With Quote
Old 25th August 2006, 05:52 AM   #2
johndiy is offline johndiy  Greece
Join Date: Aug 2006
id change the caps only because i have no experience at mod

go for it

  Reply With Quote
Old 25th August 2006, 06:15 AM   #3
wineds is offline wineds  Australia
diyAudio Member
Join Date: Apr 2006
Location: Melbourne
pic of inside...
Attached Images
File Type: jpg ca840v2.jpg (94.1 KB, 778 views)
  Reply With Quote
Old 25th August 2006, 11:07 AM   #4
adinica is offline adinica  Romania
diyAudio Member
Join Date: Mar 2005
Location: bucharest
Unfortunatelly, the power trafo it`s not a toroid, it`s actually an el-core type. If you are happy with the sound, by changing some of the components like op-amps and capacitors, the new sound may become unpleasant for you.
It`s my case with my Marantz cd67se (modded with opa2134 and Nippon-Chemicon caps).
  Reply With Quote
Old 25th August 2006, 11:12 AM   #5
Salas is offline Salas  Greece
diyAudio Chief Moderator
Salas's Avatar
Join Date: Oct 2002
Location: Athens-Greece
Cambridge Audio 640C V2
Use OP275 for Marantz. They match.
  Reply With Quote
Old 26th August 2006, 12:03 AM   #6
wineds is offline wineds  Australia
diyAudio Member
Join Date: Apr 2006
Location: Melbourne
Adinica - If I remove the NE5532s, I will replace them with sockets so I can try many different opamps like OPA627 maybe. Also, I can revert to NE5532 if things soudn worse.
  Reply With Quote
Old 26th August 2006, 09:00 AM   #7
tubenut is offline tubenut  South Africa
diyAudio Member
tubenut's Avatar
Join Date: Nov 2002
Location: South Africa, Jhb
careful now... 5532 is dual, 627 single.
I would imagine the cambridge stuff to be voiced and designed so do one thing at a time so you can go back. Not all technically better bits sound better in all applications....
Croak Audio Exploration
  Reply With Quote
Old 27th August 2006, 08:18 AM   #8
wineds is offline wineds  Australia
diyAudio Member
Join Date: Apr 2006
Location: Melbourne
Thanks Tubenut. You are right, OPA627 is a single I may try OP249 or AD8620. But I will make sure I can revert to the original configuration in case it sounds worse. Thanks!
  Reply With Quote
Old 9th December 2007, 03:35 PM   #9
Kajman is offline Kajman  United Kingdom
diyAudio Member
Join Date: Jan 2006
I am desperately trying to repair my cambridge audio 640 V2 CD player.

I have just started a new thread below though this one discusses mods you guys may be able to help


The player powers on, reads CDs and is doing all its supposed to do apart from not delivering any output on the analogue output.
I can only assume the fault is with DAC board as the transport seems fine even with the DAC bard removed.

The DAC has 9 regulators 7x 7805CV with a 7815CV/7915CV pair which got very hot (before the fault ) All these reglators do not have any heatsinks and I feel will fail with time in these units. I have replaced all these and can now hear the output relay (mute??) click on power on and switching tracks which it had stopped doing when the audio went BUT I still have no audio output.
I have now replaced most capacitors apart from the 2 big smothing caps 4700F and 6 Non polars which I do not have but still no joy.

There are 4 small transistors by the relay 2 each of S8050 and C9012 which seem hard to source not that I am sure they need replacing. I would rather replace a couple of items in one go rather than removing and testing 1 at a time especially with cheap parts which cambridge audio have used.

Any suggestions ?
  Reply With Quote
Old 27th January 2014, 07:45 PM   #10
Garuda77 is offline Garuda77  United Kingdom
diyAudio Member
Join Date: Nov 2012
I know this an old thread but.....if you are having this 'no output' problem, or even if just want to improve this player, do the lampizator 'snip it' mod, a little reduced output level for a big improvement in sound quality...highly recommended.
  Reply With Quote


Cambridge Audio 640C V2Hide 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
Cambridge Audio 640C v1 Mods Thomo Digital Source 430 19th April 2017 11:31 AM
Cambridge Audio Azur 640C V1 dome406 Digital Source 12 15th December 2012 08:18 AM
Any new tweaks for Cambridge 640c V2? Garlando Digital Source 0 22nd July 2009 05:04 PM
Cambridge 640C V2 Vs Pioneer PD D6 enzedone Digital Source 0 12th January 2009 08:38 PM
Cambridge Audio 640C No audio output PLEASE HELP! Kajman Digital Source 3 10th December 2007 09:45 AM

New To Site? Need Help?

All times are GMT. The time now is 01:20 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio