Quiescent Current Luxman M-03 - 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 13th August 2003, 11:59 AM   #1
Weide is offline Weide  Germany
diyAudio Member
 
Join Date: Aug 2003
Location: Hamburg
Default Quiescent Current Luxman M-03

Hello,

I have to adjust the quiescent current of my Luxman M-03 Amplifier. In my downloaded Schematic (I found it in this Forum - thanks) there ist no hint where i have to measure the current and what value i have to adjust.

Could someone help me?


Thanks,

Weide
  Reply With Quote
Old 10th November 2003, 07:55 PM   #2
2002tii is offline 2002tii  Norway
diyAudio Member
 
Join Date: Apr 2002
Location: Norway
On left channel you measure between pin 1 and 3 at CB104 and on the right you measure at CB204.
Original the amplifier runs 3.5+/-0.5mV.
You should set the attenuators at minimum when doing this measurement recording to the servicemanual...

I have replaced the trimpots VR101 and VR201 with 20turn ones (easier to adjust and stays at selected value) and turned the current up a bit so that the amplifier now is quite hot (ca50C) when on.
I can`t really remember how much current I run my M-03 at, but I will see if I can measure it again some day.

I also replaced C121, C122, C221 and C222 with 1uF Wima MKP, and I removed the level potmeters and connected the input terminals directly to the amplifier pcb.

All this resulted in a "new" amplifier, it sounds much bigger and more relaxed.
__________________
Regards Dan M.
  Reply With Quote
Old 10th November 2003, 10:07 PM   #3
Weide is offline Weide  Germany
diyAudio Member
 
Join Date: Aug 2003
Location: Hamburg
Hello Dan,

thanks a lot for this info

best regards

Weide
  Reply With Quote
Old 6th January 2012, 10:56 PM   #4
diyAudio Member
 
Join Date: Apr 2010
Location: Eindhoven ,Nederland
Default luxman M-03b

Thanx for the info , just made the modifications and checked the idle setting , because one channel was a bit cooler . Now it's running on 4,19 mV . Jou are right about those trimpot's . They are not quite the most stable components for such a nice amp... I purchased myself a nice set of Spendor bc3's , my amp now sounds more relaxed indeed !

Can you let me know what idle setting you use ? , just curious ..

Thanks !
  Reply With Quote
Old 7th January 2012, 07:48 AM   #5
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
be aware ...there various articles in the forum talking about situations of the M03 mostly regarding soldering problems on the amplifier boards .

I presume you already been there if not you are actually in danger you have to look at this ASAP
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 7th January 2012, 10:33 AM   #6
diyAudio Member
 
Join Date: Apr 2010
Location: Eindhoven ,Nederland
Sakis , thanx for the warning . I had some soldering problems before with this amp . It was so strange , it got microfonic ... So I took it apart and did every soldering joint again . ( quite a work ) . Also I had an issue before , Powered it up but no click from the outputrelais . After a while I found a transistor which had un soldered itself ( located in the back , in the amp protection cirquit ) Also made a heatsink on this one .... But for me the Luxman M-03 is still a very nice amp , this machine has tremendous power reserves and a clean , precise sound .

Greets ,
  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
Quiescent current question? thanks crippledchicken Solid State 29 18th June 2005 09:58 PM
quiescent current different on both channels? crippledchicken Solid State 6 21st November 2004 02:55 AM
P3a No quiescent current! PetarLD Solid State 9 17th February 2004 01:20 AM
LM3886 and it's quiescent current Toster Chip Amps 5 5th May 2003 10:23 PM
Quiescent Current JohnClark Solid State 13 16th November 2001 08:20 PM


New To Site? Need Help?

All times are GMT. The time now is 10:08 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