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 20th February 2012, 04:10 PM   #1
diyAudio Member
 
Join Date: Jan 2012
Location: foothills of the smokies
Default aragon 4004 mk2 schematic needed

hello all- i have an aragon 4004mk2 that suffered a spike when the negative power supply rail on my preamp failed. 1 channel popped a fuse and i found a couple of driver transistors shorted and a shorted current regulating diode.
it looks like i need a schematic to proceed further.
if anyone out there can help, i would be most appreciative.

regards, leapingknome
  Reply With Quote
Old 20th February 2012, 09:17 PM   #2
Nrik is offline Nrik  Denmark
diyAudio Member
 
Join Date: Feb 2005
Location: Copenhagen
Check
Attached Files
File Type: pdf Aragon 4004 2004.pdf (76.2 KB, 215 views)
__________________
STOP - Hammertime!
  Reply With Quote
Old 20th February 2012, 09:40 PM   #3
diyAudio Member
 
Join Date: Apr 2003
Location: Eastern Pennsylvania
Quote:
Originally Posted by Nrik View Post
Check
I only very briefly examined the schematic, but I did note an interesting design decision. The inclusion of 680pF capacitors C2 and C12 seems odd, as they are located inside the error correction loop and will shunt high-frequency currents to outside the loop. The input stage error amplifier will attempt to correct for the lost loop current, decreasing high-frequency feedback and, I should think, increasing high-frequency distortion. I would think that Cdom caps., C3 and C13, should be sufficient for stability, unless they are undersized. Perhaps, the designer felt it simply sounded better this way.
__________________
Ken

Last edited by Ken Newton; 20th February 2012 at 09:52 PM.
  Reply With Quote
Old 21st February 2012, 12:39 PM   #4
diyAudio Member
 
Join Date: Jan 2012
Location: foothills of the smokies
thank you for the info.
regards, leapingknome
  Reply With Quote
Old 17th February 2013, 03:43 PM   #5
diyAudio Member
 
Join Date: Aug 2008
Sorry to revive an old thread but I have a 4004 MK I that has a hum in both channels but only when connected to ANY preamp via the RCA inputs. If the amp is powered on and connected to speakers and not connected to a preamp or source, no hum. If the amp is then connected to ANY preamp including a 100% dc ipod nano touch as a source, both channels have a clearly audible hum. Sounds like 60 hz. I have tried 3 different preamps all with the same result.

Any ideas? The amp still plays and sounds great, just hums with a pre or source connected. Also the toroids do have an audible buzz when powered on. i have tried a DC blocker with no results. This amp ran fine in a friends rig for years with no hum from the speakers even though the toroids have always had a low buzz. Now in my rig it hums. Both channels.
  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
Aragon 4004 slow relay problem Colin151 Solid State 2 3rd December 2013 09:06 AM
Aragon 4004 power amp channel imbalance David120 Solid State 7 12th August 2011 05:46 PM
Classic Aragon (2004, 2004 MK II, 4004, 4004 MK II ) problems, experience and repairs MagicMarksy Solid State 1 22nd May 2010 03:36 PM
Update of the Aragon 4004 mightydub Solid State 10 5th November 2009 06:02 AM
Aragon 4004 ben goh Solid State 0 3rd May 2003 03:55 AM


New To Site? Need Help?

All times are GMT. The time now is 11:54 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