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Old 3rd April 2012, 03:02 PM   #11
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Join Date: Mar 2012
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 ..
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Old 3rd April 2012, 06:35 PM   #12
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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, 54 views)

Last edited by felipemuniz; 3rd April 2012 at 06:38 PM.
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