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.

Service manual for Eltrocompaniet AW 3-2
Service manual for Eltrocompaniet AW 3-2
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
Thread Tools Search this Thread
Old 22nd March 2003, 01:39 PM   #1
Henckel is offline Henckel  Denmark
diyAudio Member
Join Date: Sep 2002
Location: Copenhagen, Denmark
Default Service manual for Eltrocompaniet AW 3-2


I found two Elctrocompaniet AW 3-2( mid 80ties) in a garbage can. Apperently they have been modified for some kind of briding configuration.

In order to restore them back to there original state i could really use the service manual - anybody in for some help ?

What i need is maybee not the full diagram but the value of R39 and R40 as well instructions for setting bias


  Reply With Quote
Old 12th December 2004, 05:00 PM   #2
mbosko is offline mbosko  Yugoslavia
diyAudio Member
Join Date: Nov 2004
Location: ovde
Default About bias

Just found this:

"What quiescent current should I use ?
The quiescent current should be calculated from each transitors
Hfe versus Ic curve.
It should be set to no more than sligthly less than half the current
at which Hfe has its maximum.
Lower limit - don't push it too far down"

Hope this will help
Attached Images
File Type: jpg old_amplifier.jpg (61.9 KB, 257 views)
  Reply With Quote
Old 13th December 2004, 02:31 AM   #3
Jonathan Bright is offline Jonathan Bright  Australia
diyAudio Member
Join Date: Feb 2004
Location: Queensland Australia
Dear Henckel, The place to start is a web site that has a lot of information on the amp'. Try this. http://home.online.no/~trandstr/AudioStartsHere.htm
I found it by putting something like "Otala amp" in Google. It is a site run by one of the original designers. The schematic that was posted by Mbosko was from an article in a journal of "Transactions in Speech and Acoustics" or something like that and refers to the 1973 original version that was later modified a good deal before it was marketed commercially. The website has the modifications. The original had 600 milli amps (0.6 amp) in the output stage. It ran class A up to about 13db below clipping from memory. But ckeck out the site as I think it will be useful.

I have just tried the site mentioned and ended up with a Sandinavian site (home online) that I could not read. The one I had was in English. Maybe try Google straight away. Try "The Sandstrom Audio Site" that should work or the "EC" homepage.
"It was the Springtime of the year when aunt is calling to aunt like mastodons bellowing across primeval swamps." P.G. Wodehouse.
  Reply With Quote


Service manual for Eltrocompaniet AW 3-2Hide 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
Seek help: Leader LDM-171 user manual (Service Manual) 0451ym Parts 1 21st November 2013 03:10 PM
AVR 210 Service Manual dshambala Solid State 2 26th September 2008 12:57 PM
A5 service manual recife Pass Labs 2 10th February 2007 01:04 PM
I need the Service Manual of WM-DC2. micorpig Analogue Source 0 8th December 2006 06:37 AM
SP 10 Service Manual romero Analogue Source 1 13th April 2004 03:45 AM

New To Site? Need Help?

All times are GMT. The time now is 05:56 PM.

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