Modding Azur 640A - Page 4 - 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 6th October 2008, 04:44 PM   #31
diyAudio Member
 
Agus Widarto's Avatar
 
Join Date: Dec 2007
Location: Bekasi Indonesia
My post picture is just for rest and relax for yuo're all problem with CA 340A/640A. Actually I'am already sold many unit about cambridge audio ( 340,540,640 ) so far so good! and think to mod power supply ( Capacitor section ) unit is good way!
Attached Images
File Type: jpg 101_1222.jpg (29.0 KB, 1069 views)
__________________
For whatsover a man soweth,that shall he also reap!
http://hermonresearch.blogspot.com
  Reply With Quote
Old 6th October 2008, 05:35 PM   #32
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Yes Mikesnowdown... soon i will receive more samples of this chip


also some nice operational amplifiers...and for sure i will build one to stay.

A friend called Sean is shipping some nice and fast Operational Amplifiers and Dudainc is shipping breadboard and LM3866... I have never had problems to obtain those parts.... when we have good friends, in special if they leave outside Brasil, to have those parts are not a big problem... we have only to let them know we need those things and fast they ship for me...i am lucky and not proud..not problems to accept gifts.

I said 30 to 35 watts because into this range of power it distorts almost nothing... very good sound when you accept low power.

For sure it can go to 55 watts...or 50... or 45...or 40...but distortion and audio quality goes down.

I had some of them, and i have perceived that... this is not observing data sheet...was something i found listening... 30 watts is perfect for this chip.

I have some units tested (chips) into Youtube... video samples of my "barbecue of chips" when i have destroyed many (destroyer X)

Thank you once again Mike... was kind from you.... a lot pleasant for me my new friend.

Carlos
__________________
Germans in Brazil https://www.youtube.com/watch?v=ASrUNevw76g
  Reply With Quote
Old 6th October 2008, 05:38 PM   #33
diyAudio Member
 
mikesnowdon's Avatar
 
Join Date: Aug 2007
Your welcome C!
__________________
www.drugfreeworld.org
  Reply With Quote
Old 6th October 2008, 06:01 PM   #34
diyAudio Member
 
mikesnowdon's Avatar
 
Join Date: Aug 2007
Quote:
My post picture is just for rest and relax for yuo're all problem with CA 340A/640A. Actually I'am already sold many unit about cambridge audio ( 340,540,640 ) so far so good! and think to mod power supply ( Capacitor section ) unit is good way!
Indeed CA make good amps (and CDP's). Just look at the awards for he 340A SE.

here
__________________
www.drugfreeworld.org
  Reply With Quote
Old 6th October 2008, 06:07 PM   #35
diyAudio Member
 
mikesnowdon's Avatar
 
Join Date: Aug 2007
Agus Widarto,

Whats that rack of 340A's for then? Are you using them for a multi channel HT setup?
__________________
www.drugfreeworld.org
  Reply With Quote
Old 6th October 2008, 06:21 PM   #36
diyAudio Member
 
mikesnowdon's Avatar
 
Join Date: Aug 2007
This may be of interest:

I had Greg B, designer of the famous SKA audio modules take a look at the CA 340 circuit. I was asking about intalling one of his LDR volume control and 'SK Pre' preamp modules in the 340. I had an issue about the gain being too high. Heres something he advised....

Quote:
The easy solution here is not to reduce the gain in the buffer stage, but to reduce it in the power amplifier. This is easily done by changing R53, R55 ( 270K) for 24K.
This has the added advantage of reducing noise as higher signal levels are maintained through the volume / tone controls and into the main amp. Also there is 6dB extra feedback around the power amp chips for lower loop distortion and a 6dB PSRR improvement on their weaker -Vs supply. Phase margin is worse by only 7o, insignificant.
__________________
www.drugfreeworld.org
  Reply With Quote
Old 7th October 2008, 05:37 PM   #37
diyAudio Member
 
Agus Widarto's Avatar
 
Join Date: Dec 2007
Location: Bekasi Indonesia
Quote:
Originally posted by mikesnowdon
Agus Widarto,

Whats that rack of 340A's for then? Are you using them for a multi channel HT setup?

Thats rack is costume, hand made! no Iam using them for multi room aplification controled by amx
__________________
For whatsover a man soweth,that shall he also reap!
http://hermonresearch.blogspot.com
  Reply With Quote
Old 8th October 2008, 08:43 PM   #38
diyAudio Member
 
nelsonvandal's Avatar
 
Join Date: Nov 2006
NE5532/34 sounds fairly neutral and unoffensive but rather dull and lifeless. Even the best opamps are cheap. Tell us in what way you want to change the sound of your Azur, and I'm sure you'll get plenty of suggestions, and please measure the voltage supply to the NE5534.
  Reply With Quote
Old 9th October 2008, 09:21 AM   #39
diyAudio Member
 
mikesnowdon's Avatar
 
Join Date: Aug 2007
Quote:
NE5532/34 sounds fairly neutral and unoffensive but rather dull and lifeless.
Really? So what op-amp is the best then?
__________________
www.drugfreeworld.org
  Reply With Quote
Old 9th October 2008, 03:55 PM   #40
diyAudio Member
 
nelsonvandal's Avatar
 
Join Date: Nov 2006
Quote:
Originally posted by mikesnowdon


Really? So what op-amp is the best then?
Some examples:
AD797 - the best I've heard, very clean and neutral, maybe a bit too soft, only comes as single amp so you need two on an adapter, needs some attention to sound at it's best, not a drop in replacement
AD8599 - clean and warm and almost neutral, slightly recessed mids and laid back
LM4562=LME49620 - bright and clean, also slightly recessed mid
AD8066 - fast with bright treble and and a kick *** bass, slightly grainy and harsh, lively and fun
AD8620 - very neutral but grainy and harsh
OPA2107 - very warm and sweet but a bit grainy and lacks details
AD825 - forward mid, detailed, clean, involving, only single - requires two on an adapter

OPA637 or OPA627, and LT1364, are often claimed to be amongst the best, but I haven't heard them.
  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
Cambridge Audio Azur 640C V1 dome406 Digital Source 12 15th December 2012 09:18 AM
Modding a Cambridge AZUR 740C Cormac Digital Source 14 2nd March 2012 05:20 PM
Blown-up Azur 340A borges Chip Amps 7 17th March 2010 04:17 PM
Cambridge Audio 640A V2 - service manual Paolo.n Solid State 0 7th July 2009 12:19 PM
Cambridge Audio Azur 640A toroidal power transformer (115V) limono Swap Meet 1 25th December 2008 05:57 PM


New To Site? Need Help?

All times are GMT. The time now is 12:36 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