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.

rotel rcd951 upgrades
rotel rcd951 upgrades
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 4th November 2011, 08:11 PM   #1
smithie is offline smithie  United Kingdom
diyAudio Member
Join Date: Jan 2005
Location: cornwall
Default rotel rcd951 upgrades

hi everyone
im trying to do afew mods to a old rotel 951 as im quite fond of this player.
ive started by replacing the clock with a audio gd clock although its being powered by the orginal 805 regulator within the cd player so im guessing im not getting the best from it yet .ive also damped down the base plate and lid,im also going to swop out the blackgate caps in favour of silmic 2 caps as i like the sound these caps produce,plus i should think the original caps are pretty tired by now.
my first question is the player has in4003 diodes,im guessing i can improve on these and maybe improve the player also...but with what? any make,model number and place to source would be helpful,along with anyother tips for extracting the max out of this player while still keeping the costs of mods at sane levels.
any help would be much appricated.
  Reply With Quote
Old 25th December 2011, 08:34 PM   #2
timjac41 is offline timjac41  Turkey
diyAudio Member
Join Date: Feb 2009
Default Did one about 4-5 years ago -

So the details not to fresh in the head and possible better bits available now.
Fitted a Net Audio clock with PSU (just fitted in this slim case).
Changed the Diodes to UF4003.
OP Amps to AD826AN or OP275 (thinking the later), as its now at my sons I cant open to be sure.
Sorry for the late reply and my first post
All bought in UK, thinking mail order?

Last edited by timjac41; 25th December 2011 at 08:41 PM.
  Reply With Quote
Old 25th December 2011, 10:38 PM   #3
stephensank is offline stephensank  United States
diyAudio Member
Join Date: Oct 2006
Although I feel the PCM69 dac & pmd100 DF used are too much of an ultimate limiter, at a not very high level of fidelity, I'll try to be helpful.
I think you'll find the OPA134/2134 to be much more tonally rich, without unnatural coloration, than the opamps you mention, but it's essential to give any of these much more generous & clean power supply than stock unit. The UF4003's are a bit pointless, as without being soft recovery, speed offers little sonic benefit. Better to use IRC HFA-series or IXYS dsei-series soft recovery types, which will actually make a substantial difference. As you seem to know, it's quite important to give the clock a power supply that is well isolated & as clean as possible. At the least, you should put a decent size inductor, followed by a big lytic & film, between clock & 7805, and ideally give it it's own 5v reg. On the output of the analog, you should darn well be able to simply eliminate any dc blocking caps that may or may not be in the signal path. Should be 0VDC on the opamp out lines.
  Reply With Quote
Old 5th January 2012, 08:38 PM   #4
timjac41 is offline timjac41  Turkey
diyAudio Member
Join Date: Feb 2009
Thanks for the reply, although I stated this was with my son, he is no longer using it. Think I may have to reacquire it to play again.
From your advice above I'm thinking your comments on the DAC/OPAmp that this maybe the way to go?
This may also render the cleaning up of the PS a little pointless, as the DAC has its own?
Any comment more than welcomed.
PS Just getting back into electronics (never did audio before). Looking at the affordable transport thread with great interest, DAC first; next logical step?
  Reply With Quote


rotel rcd951 upgradesHide 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
Rotel RCD951 mod need help fastvideo Digital Source 3 29th June 2009 12:57 AM
Rotel rcd951 need help troubleshooting fastvideo Digital Source 24 20th July 2008 06:12 PM
Rotel RCD951 CD player service manual tubenut Digital Source 11 19th April 2008 12:06 PM
Upgrades for Rotel RCD990 GerardA Digital Source 11 17th April 2005 09:06 PM
Laser type on Rotel RCD951? tubenut Digital Source 2 2nd December 2004 05:17 AM

New To Site? Need Help?

All times are GMT. The time now is 06:57 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio