IsoMagic fault - distortion - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, 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 8th February 2010, 01:29 PM   #1
diyAudio Member
 
Join Date: Feb 2010
Default IsoMagic fault - distortion

I have a classic Cambridge Audio IsoMagic which has begun producing a very distorted sound. The distortion is equally audible whether I use the optical or electrical input, and is always present. Presumably therefore this is analogue output-related. I really like the sound of the DAC (when it's working properly!) so would greatly appreciate any help trying to restore it to full working order.

Thank you
  Reply With Quote
Old 11th February 2010, 11:22 AM   #2
diyAudio Member
 
Join Date: Feb 2010
I've had a look at the caps and while there is contaminant at the edge of the PCB, I'm not entirely convinced this is leakage. Can anyone confirm for me from this photo?

Click the image to open in full size.
  Reply With Quote
Old 11th February 2010, 01:20 PM   #3
diyAudio Member
 
Sonusthree's Avatar
 
Join Date: Dec 2005
Location: Sussex, UK
Hi Florette, I always wanted one of these DACs..... but all I have is one of the 'puds'!

The designer, John Westlake, is a member here. I've sent him a message with a link to your posts. I think he is quite busy at the moment with some new products but he, very commendably, stands by his old designs.

Best wishes,
__________________
Martin
+ + =
  Reply With Quote
Old 11th February 2010, 02:00 PM   #4
JohnW is offline JohnW  Hong Kong
diyAudio Member
 
JohnW's Avatar
 
Join Date: Jan 2004
Location: Discovery Bay, Prague, Paris...
Hi Florette69,

Have you tried to change the small silver toggle switch setting on the rear panel? - try switching it over (Selects between Clock Lock & Non Clock Lock Mode).

I cannot open your photo....

John
__________________
Life shouldn't be taken too seriously as at the end of the day you will not come out of it alive anyway…
  Reply With Quote
Old 11th February 2010, 02:35 PM   #5
diyAudio Member
 
Sonusthree's Avatar
 
Join Date: Dec 2005
Location: Sussex, UK
Quote:
Originally Posted by JohnW View Post

I cannot open your photo....
It's hosted at another forum and you have to be a member there to view it.
__________________
Martin
+ + =
  Reply With Quote
Old 11th February 2010, 02:43 PM   #6
diyAudio Member
 
Join Date: Feb 2010
Sorry, I messed up with the photo attachment. I'll try again.
Attached Images
File Type: jpg isomagic cap.JPG (50.1 KB, 26 views)
  Reply With Quote
Old 11th February 2010, 02:51 PM   #7
diyAudio Member
 
Join Date: Feb 2010
Hi John, I've tried toggling the clock lock switch, but it was in the correct position in the first place. The DAC had been performing perfectly until one night last week when the noise began midway through a track. This certainly suggests a component failure.

I used a tablelamp last night for lighting on the poor quality photo - I can take further photos in daylight if required.

Thanks again for any help.
  Reply With Quote
Old 12th February 2010, 11:34 AM   #8
diyAudio Member
 
Join Date: Feb 2010
Quote:
Originally Posted by Sonusthree View Post
Hi Florette, I always wanted one of these DACs..... but all I have is one of the 'puds'!

The designer, John Westlake, is a member here. I've sent him a message with a link to your posts. I think he is quite busy at the moment with some new products but he, very commendably, stands by his old designs.

Best wishes,
I meant to say yesterday that my 'puds' are all still sealed in their bags - never been used. I redeployed some half ping pong balls from a previous role. The whole design of the IsoMagic is so neat, I'm surprised it wasn't copied.
  Reply With Quote
Old 12th February 2010, 11:57 AM   #9
JohnW is offline JohnW  Hong Kong
diyAudio Member
 
JohnW's Avatar
 
Join Date: Jan 2004
Location: Discovery Bay, Prague, Paris...
Hi Florette69,

The "Stuff" around the capacitor is just "Glue" to hold the Cap in place - no problem with leakage.

What source are you using? The IsoMagic will only work correctly with 44.1 KHz digital sources.

As you can imagine we had fun with the "Puds" around the office. We need something cheap - these "Balls" where perfect. Mark Hickey and myself came up with the concept of Isolation platform + DAC one evening – Its still one of my favourite DAC’s.

John
__________________
Life shouldn't be taken too seriously as at the end of the day you will not come out of it alive anyway…
  Reply With Quote
Old 12th February 2010, 01:55 PM   #10
diyAudio Member
 
Join Date: Feb 2010
John, I'm using a standard CD transport. I have a Micromega and a TEAC. As I said, the DAC was performing perfectly until recently when very obvious distortion became audible halfway through a CD. The distortion is now present when any CD is played with either transport.
  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
Isomagic clock link decree Digital Line Level 8 1st March 2010 01:35 AM
Isomagic w transformers in amplifier TomasF Digital Source 0 26th February 2008 09:43 PM
Isomagic schematics and mod hints TomasF Digital Source 4 11th March 2007 08:36 AM
Distortion on p2p LM3875 - probably my fault :D quickshift Chip Amps 18 6th February 2006 10:07 PM
Isomagic modifications Bennyboyph Digital Source 1 7th April 2005 12:08 PM


New To Site? Need Help?

All times are GMT. The time now is 09:51 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