Final output stage amp marshall - Page 2 - 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 3rd April 2012, 03:02 PM   #11
diyAudio Member
 
Join Date: Mar 2012
Quote:
Originally Posted by epicyclic View Post
It seems like you have marginal stability problems .

Check C13 ...220pf.....this helps keep the power amp stable

Check all the feedback components/wiring around IC1B .
I replaced all components, including the IC.. I checked all circuit comparing with the diagram... And I connected the preamp to the power amp with a microphone wire... I also tested the preamp with separate power supply, same problem ..
  Reply With Quote
Old 3rd April 2012, 06:35 PM   #12
diyAudio Member
 
Join Date: Mar 2012
I was looking for another diagram, and I found this photos from a Marshall 3005 Lead 12 SS:

Click the image to open in full size.

Click the image to open in full size.

I have noticed many differences between these pictures and the diagram, for example, R2 is 2k2 on amp of the photos, but the diagram it is 33k .. And on the photo, the amp have a bias adjustment, the diagram don't...

Look to the attachment .. I'm seeing right?
Attached Images
File Type: jpg 3005_wth.jpg (109.5 KB, 22 views)

Last edited by felipemuniz; 3rd April 2012 at 06:38 PM.
  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
Best and final TDA1541A output stage studiostevus Digital Line Level 14 14th March 2013 04:42 AM
Completely differential amplifier final stage exeric Tubes / Valves 14 28th April 2010 06:21 PM
The CMP Final Stage Stee Solid State 0 23rd December 2008 05:49 AM
Final Stage of Building UcD400 ruangrit Class D 3 29th November 2005 01:01 AM
increase the bias current of an opamp final stage herve Solid State 19 15th September 2003 12:29 PM


New To Site? Need Help?

All times are GMT. The time now is 09:44 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