Look what I found in my new RCD-971! - 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 28th April 2008, 12:04 AM   #1
pureh2o is offline pureh2o  United States
diyAudio Member
 
Join Date: Apr 2008
Default Look what I found in my new RCD-971!

Hi all. I am new to this forum. Good to be here. Anyway, I purchased this RCD-971 yesterday, and when I arrived home, I noticed a brown envelope in the bottom of the box marked "971 Mods". Curious, I took the top cover off and found "stuff inside", much unlike my other stock 971 I own. Looks like the OPs have been changed to AD827JUs. A 9V battery has been installed for the polarity. Hmmm. I discovered that it was modified by NW Audio Labs. Sweet! I paid a whopping $220 for it. The sound is awesome. My wife and I can listen to it all day. The only problem I have with it is it is very unforgiving to shock. It will skip if I even tap the desk where it lays. Any ideas on this? I have enclosed a photo of the inside. Maybe someone can tell me what I have here. Thanks all.
Attached Images
File Type: jpg everything.jpg (62.1 KB, 420 views)
__________________
Pureh2o
  Reply With Quote
Old 29th April 2008, 04:18 PM   #2
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
I see an outboard clock, polystyrene caps in the LPF, and upgraded electrolytics in various places.. Pretty nice set of upgrades for the price.

In terms of the skipping issue take a look around the mechanism and see if there are any badly dressed cables compromising the mechanism to chassis isolation. It is also possible that the bushings in the mechanism mounts have just dried out. (Or have been removed deliberately if the unit was used on a high mass base.)

The best solution might just be to put it somewhere where there is a bit more mechanical isolation between it and you..
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 29th April 2008, 05:57 PM   #3
pureh2o is offline pureh2o  United States
diyAudio Member
 
Join Date: Apr 2008
Default Look what I found in my new RCD-971!

Thank you Kevin. I will check the mech for any problems. I noticed that AD827JNs were used for the OP amps. This was modded probably before the LM4562, and LM6172 were available. I wonder if those would be an improvement. John.
__________________
Pureh2o
  Reply With Quote
Old 29th April 2008, 07:11 PM   #4
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
The AD827 is a pretty well regarded op-amp, still it might be interesting to try some of the newer ones as well. LM4562 is worth looking at. LM6172 is prone to oscillation and hard edgy sound if not carefully decoupled right at the pins. (This is a very fast part.)
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
I Found You! Grasp Introductions 4 12th December 2008 07:54 PM
found DIY amp - now what? rickl Tubes / Valves 3 5th January 2006 05:09 AM
found... EDY Digital Source 1 5th August 2003 08:49 AM
I found you! Fusor Introductions 6 24th May 2003 10:05 PM
I found some pictures Eccu Multi-Way 5 19th May 2003 05:09 AM


New To Site? Need Help?

All times are GMT. The time now is 09:05 AM.


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