Aura Evolution VA100 Clean up & upgrade - 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 16th November 2008, 01:57 PM   #1
diyAudio Member
 
Malefoda's Avatar
 
Join Date: Jun 2006
Send a message via MSN to Malefoda
Lightbulb Aura Evolution VA100 Clean up & upgrade

Hi there,
I've just been given an Aura integrated amp, wich was an attemp of B & W to sell electronic stuff.
I've also been given the matching CD player from Aura but it's more close to normal Philips' stuff and maybe it's just another Philips with a new shell. Anyway this CDP will also be cleaned up and some parts upgraded.
link to CDP upgrade: Aura CDP Clean up & upgrade

It will be a good system to drive my Quad 11L as soon as I'll be changing speakers... maybe in many years

As far as I've read about it, it has a warm sound aimed to sound like class A amps. It's said to be a good sounding stuff with interest. Also got a phono preamp (also said to be good). Update: havin' an ear vs my current integrated (G&W TW-2006X) it's well balanced and warm at low volume, but lacking of space, details and a bit harsh.

Here is the amp:
Click the image to open in full size.Click the image to open in full size. Click the image to open in full size.Click the image to open in full size.
Phono input:
Click the image to open in full size.Click the image to open in full size.
Amp side:
Click the image to open in full size.Click the image to open in full size.
2x BHC 4700F 63V,
a single NE5532 in the middle (PS part or preamp part? ALPS pot is wired near this (black coax at bottom of the pic) so maybe it's preamp?). Still one LM4562 left if I replace the CDP's BB OPA2604.
a pair of these near the inputs or maybe just the phono preamp, with Nover 220F/40V at their side.
Loads of MKC around, after the (phono) preamp for example.

So if some of you knows this little beat tell me more!
What may be changer after all these years? It's from 1992 from the PCB.
Or factory service manual someone?

Thanks,
Matthieu
__________________
QED T260, Thorens TD-318, Marantz CD-43, TK2050, JBL 4313B & MJK's OB: music!
  Reply With Quote
Old 16th November 2008, 02:29 PM   #2
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaao
Send a message via Yahoo to jacco vermeulen
Quote:
Originally posted by Malefoda
PS part or preamp part?
VA100 Evo-3, the NE5532=> power amp input.
Analog Guy posted a schematic of the Evo-2, is same same but with a 5534 single opamp per channel.
__________________
The buck stops Here
  Reply With Quote
Old 16th November 2008, 07:57 PM   #3
diyAudio Member
 
Malefoda's Avatar
 
Join Date: Jun 2006
Send a message via MSN to Malefoda
Found is thread, nice!
So the LM4562 there will do wonders. The PS line's caps may be upgraded there, do the big 4700 BHC caps deserve to be upgraded?
Any good choice instead of the 5534 at the phono preamp? The single LM4562 wich exists or not?
The sound here should stay warm for it will be a second background music system, if that helps in the choice of caps or such.
Thanks!
__________________
QED T260, Thorens TD-318, Marantz CD-43, TK2050, JBL 4313B & MJK's OB: music!
  Reply With Quote
Old 16th November 2008, 10:33 PM   #4
aandy is offline aandy  United Kingdom
diyAudio Member
 
Join Date: Mar 2007
Location: in UK unfortunatly
What does the opamp in the middle do?
  Reply With Quote
Old 16th November 2008, 10:46 PM   #5
aandy is offline aandy  United Kingdom
diyAudio Member
 
Join Date: Mar 2007
Location: in UK unfortunatly
If you replace the 2sj162 with Buz906dp and 2sk1058 with Buz901dp
this will increase the output current dramatically

you will need to increase the bius current slightly.

the next week link is the transformer,B and W used the cheapest toridal at the time and not one for good performance.

i Have a concerned about that opamp in the middle, what is doing as the VA40 did not use one and many people have reported that the VA 100 did not sound as good as the VA40.
No line buffer is needed to drive the power amplifier inputs.
so this will help make the amplifier sound Harsh along with to much negative feed back (making the amplifier over damped)
  Reply With Quote
Old 17th November 2008, 07:17 AM   #6
diyAudio Member
 
Malefoda's Avatar
 
Join Date: Jun 2006
Send a message via MSN to Malefoda
Hi Andy,
Quote:
replace the 2sj162 with Buz906dp and 2sk1058 with Buz901dp
I won't go that far for now or maybe ever as it's not my main system and I just want to " release " the sound, and what you said is really what I feel comparing this to my main integrated, " a bit harsh and damped ".
Will have a fast try with the LM4562 as it's been said to do wonders as an preamp.

If any way to simplify that stuff and remove parts as it seems that preamp/buffer part can be taken away please let me know, and let me know how to do.

Thanks guys!
__________________
QED T260, Thorens TD-318, Marantz CD-43, TK2050, JBL 4313B & MJK's OB: music!
  Reply With Quote
Old 17th November 2008, 08:00 AM   #7
aandy is offline aandy  United Kingdom
diyAudio Member
 
Join Date: Mar 2007
Location: in UK unfortunatly
Yes the buffer does nothing.
I guess it was put there to reduce the sound quality by a person of limited knowledge.
just link it out.
you will have to take close ups of the pcb back so i can work it out
  Reply With Quote
Old 17th November 2008, 08:08 AM   #8
diyAudio Member
 
Malefoda's Avatar
 
Join Date: Jun 2006
Send a message via MSN to Malefoda
Ok I'll do that!
Jacco lonked this:
Aura Va100 Evoluton Ii
If that may help... mine shows "evolution 7" on the PCB.
There's a story of varying load or such...
Back with pics soon. I love removing, it's free!
__________________
QED T260, Thorens TD-318, Marantz CD-43, TK2050, JBL 4313B & MJK's OB: music!
  Reply With Quote
Old 17th November 2008, 08:39 AM   #9
diyAudio Member
 
Malefoda's Avatar
 
Join Date: Jun 2006
Send a message via MSN to Malefoda
The dead picture from the main post:
Click the image to open in full size.
__________________
QED T260, Thorens TD-318, Marantz CD-43, TK2050, JBL 4313B & MJK's OB: music!
  Reply With Quote
Old 17th November 2008, 08:43 AM   #10
aandy is offline aandy  United Kingdom
diyAudio Member
 
Join Date: Mar 2007
Location: in UK unfortunatly
sorry if that is the circuit they used it will be very difficult to remove the oppamp.
and thats why it did not sound as good as the original

I can send you some pictures of the first aura amplifier if you want to post 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
Aura Va100 Evoluton Ii ANALOG GUY Solid State 31 25th February 2012 01:46 PM
evolution algorithm Jamh Everything Else 0 8th June 2009 05:04 PM
Aura CDP Clean up & upgrade Malefoda Digital Source 39 5th April 2009 09:40 AM
Evolution MK-7 midi keyboard em2006 Instruments and Amps 1 12th September 2008 08:55 PM
Evolution board AD1955 fantomas Digital Source 1 30th September 2005 10:03 PM


New To Site? Need Help?

All times are GMT. The time now is 03:17 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