Cambridge Azur 640A V1 Buzz - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 24th May 2010, 10:43 PM   #1
diyAudio Member
 
Join Date: Oct 2009
Location: Winnipeg, Manitoba
Default Cambridge Azur 640A V1 Buzz

Still working on other stuff on this forum. Thought the following would be a no brainer. Sigh...

Looking to fix my son's integrated. It buzz's upon start-up then (mostly) goes away after about 30 minutes.

Buzz is there without any signal, only speakers hooked up.

Observed that if you turn the volume up, the buzz disappears around the 9 to 11 o'clock area, then starts again.

I have tried cleaning the volume control pot, and all other pots for good measure to no effect. (MG Chemicals zero residue spray)

I still thinking the volume control, but weird that after warm up the buzz fades.

Any help would be appreciated.

Ed
  Reply With Quote
Old 13th June 2010, 02:15 AM   #2
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
OK Ed, we are here now. Others may follow now with some better advice once inside the amp. I admit I have never checked inside a Cambridge of this Azur species before but some general principles will apply to all SS amps. I believe this is a conventional class AB type and not the XD type of 740 and 840 models. Anyways, I guess we'll hear from you after the father's day activities.
__________________
Ian
  Reply With Quote
Old 13th June 2010, 03:00 AM   #3
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
id look for a bad capacitor in the signal path
  Reply With Quote
Old 13th June 2010, 05:47 PM   #4
diyAudio Member
 
Join Date: Oct 2009
Location: Winnipeg, Manitoba
Gaaaa. First thing I realized after I slept in... Father's Day is next weekend, June 20th! So I got that straightened out. Will work with suggestions given. Thanks all!

Ed
  Reply With Quote
Old 13th June 2010, 06:55 PM   #5
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Both channels affected or just one ?
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 13th June 2010, 08:21 PM   #6
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
Listen to the signal at the pre-out sockets. Does that have the buzz too?
  Reply With Quote
Old 13th June 2010, 08:35 PM   #7
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
Here's the service manual
  Reply With Quote
Old 18th June 2010, 01:24 AM   #8
diyAudio Member
 
Join Date: Oct 2009
Location: Winnipeg, Manitoba
Thanks Jaycee,

Lot of things to test that I had not even thought of to help narrow the problem down.

I will be able to do some poking around this weekend.

Ed
  Reply With Quote
Old 20th June 2010, 10:09 PM   #9
diyAudio Member
 
Join Date: Oct 2009
Location: Winnipeg, Manitoba
Buzzing at pre-outs when hooked up to a separate amp and speakers (both L &R), no source! Great tip. That narrows things down. Will start looking at caps, wires and such in signal paths.
  Reply With Quote
Old 20th June 2010, 11:18 PM   #10
diyAudio Member
 
Join Date: Feb 2010
Location: Bucharest
Send a message via Yahoo to Th3 uN1Qu3
Since it goes away after a while it's definitely a bad capacitor.
  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
Modding Azur 640A i2k92 Solid State 119 2nd September 2014 02:21 PM
Cambridge Audio Azur 640C V1 dome406 Digital Source 12 15th December 2012 08:18 AM
Cambridge Audio Azur 640A v2 problem kynsi Solid State 3 9th October 2011 10:15 PM
Azur 640A v2 Service manual johnny52 Solid State 0 7th November 2009 02:36 PM
Cambridge Audio Azur 640A toroidal power transformer (115V) limono Swap Meet 1 25th December 2008 04:57 PM


New To Site? Need Help?

All times are GMT. The time now is 02:53 PM.


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