Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Electrocompaniet AW65 Help request
Electrocompaniet AW65 Help request
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 March 2006, 10:39 AM   #1
rollo22 is offline rollo22
diyAudio Member
 
Join Date: Nov 2005
Location: Milano
Default Electrocompaniet AW65 Help request

Hello all
Could anyone, please, give me some clarity on this issue ?

The schematics is for the Input Stage only of the AW65.

Power Supply is -+47Volts.

The offset measured at OUT drifts with temperature from - 10Volts to +3Volt after 2 minutes.

The temp of Q8-Q9 reaches 63ºC.

The calculated current on Q9 (Vce 36V) collector is 23mA for a dissipation of 800 mW.

Does it all make sense ?

I have doubts that the offset should drift so much.

I heard that Electrocompaniet amps dissipate a lot of heat, maybe that's why the fault on this amp destroyed so many transistors, they work at such Hi Temp.

Many Thanks

Rollo
Attached Images
File Type: jpg aw65.jpg (50.9 KB, 1296 views)
  Reply With Quote
Old 28th March 2006, 11:04 AM   #2
Andypairo is offline Andypairo  Italy
diyAudio Member
 
Andypairo's Avatar
 
Join Date: Sep 2002
Location: near Milano , Italy
Hi Rollo,
IIRC the AW65 has a separate protection-servo board.

Do you have a photo of your unit?
I once have fixed a wannabe-AW65 (but more likely a mixup between different EC models)

Ciao

Andrea
__________________
I don't believe in audiophile components - except when I can get them at frugal-phile(tm) prices
  Reply With Quote
Old 28th March 2006, 02:45 PM   #3
rollo22 is offline rollo22
diyAudio Member
 
Join Date: Nov 2005
Location: Milano
Here it is
Please tell me all the dilfferences you see.
I think the big blue caps are not original.
There are some Transistors missing for now.
Ciao
Attached Images
File Type: jpeg aw65inside.jpeg (40.9 KB, 1211 views)
  Reply With Quote
Old 28th March 2006, 02:58 PM   #4
Andypairo is offline Andypairo  Italy
diyAudio Member
 
Andypairo's Avatar
 
Join Date: Sep 2002
Location: near Milano , Italy
Hi,
you can check the one I have here http://www.diyaudio.com/forums/showt...=&pagenumber=2

Btw you seem to miss the protection / servo boards... the photos I made show that these are marked "AW-65"... let me guess... does your amp come from a "official" EC repairer in Meda?

If so both you and my friend (the owner of the amp) have ben screwed by the same guy....

Cheers

Andrea
__________________
I don't believe in audiophile components - except when I can get them at frugal-phile(tm) prices
  Reply With Quote
Old 28th March 2006, 04:08 PM   #5
darkfenriz is offline darkfenriz  Poland
diyAudio Member
 
darkfenriz's Avatar
 
Join Date: Jun 2004
Location: Warsaw
Q8 should be NPN
  Reply With Quote
Old 28th March 2006, 04:31 PM   #6
rollo22 is offline rollo22
diyAudio Member
 
Join Date: Nov 2005
Location: Milano
Hi
there is a marking AW behind the finals and pp on lower right.

No, I bought it from a guy in Switzerland.

Have you got a photo of the servo board with connections to the amp board ?
even if you made it.

Thanks

Rollo
Attached Images
File Type: jpg aw65back.jpg (36.3 KB, 1071 views)
  Reply With Quote
Old 28th March 2006, 04:32 PM   #7
rollo22 is offline rollo22
diyAudio Member
 
Join Date: Nov 2005
Location: Milano
and this
Attached Images
File Type: jpg aw65brdf.jpg (43.7 KB, 1067 views)
  Reply With Quote
Old 28th March 2006, 04:33 PM   #8
jacco vermeulen is offline jacco vermeulen  Netherlands
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
I suppose the original MT200 Toshiba output devices are blown too ?
The original electrolytics were Roedersteins, these looke like Philips or Sprague.
__________________
Why does it hurt when I Pee ? (Ay Ay Ay https://www.youtube.com/watch?v=w5fLGWrHouk)
  Reply With Quote
Old 28th March 2006, 04:36 PM   #9
rollo22 is offline rollo22
diyAudio Member
 
Join Date: Nov 2005
Location: Milano
Yes it is the same as Q9, my mistake (the model is the same though).

as and finally...
Attached Images
File Type: jpg aw65brdb.jpg (53.7 KB, 1052 views)
  Reply With Quote
Old 28th March 2006, 04:53 PM   #10
rollo22 is offline rollo22
diyAudio Member
 
Join Date: Nov 2005
Location: Milano
Here's the right drawing, I hope...

Rollo
Attached Images
File Type: jpeg aw65inpstage.jpeg (43.1 KB, 1292 views)
  Reply With Quote

Reply


Electrocompaniet AW65 Help requestHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Electrocompaniet Help Andypairo Solid State 72 3rd December 2015 03:25 PM
Electrocompaniet ECI-4??? kimschips Solid State 18 4th February 2015 03:46 AM
Electrocompaniet aw65 transistors substitutes rollo22 Solid State 7 2nd February 2006 06:14 PM
Electrocompaniet AW 250 AMP. hogue Solid State 1 1st March 2004 05:48 AM


New To Site? Need Help?

All times are GMT. The time now is 11:42 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki