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Old 21st September 2004, 03:39 PM   #1
Hardi is offline Hardi  Germany
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Default MarkLevinson ML3 schematics ?

Hello,

i have a defective ML-3 amplifier with many non-riginal parts inside. Someone used wrong resistors and semiconductors in both channels .
A successful repair seems to be impossible without a schematic diagram.
Any ideas how to get it ? Any help will be a appreciated.


Hardi
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Old 21st September 2004, 04:03 PM   #2
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Default Re: MarkLevinson ML3 schematics ?

Quote:
Originally posted by Hardi
Hello,

i have a defective ML-3 amplifier with many non-riginal parts inside. Someone used wrong resistors and semiconductors in both channels .
Hi Hardi

Without a schematic, wow do you know that the resistors and the semiconductors are wrong?...
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Old 21st September 2004, 04:04 PM   #3
Konrad is offline Konrad  Norway
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http://home.kimo.com.tw/skychutw/index.html
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Old 21st September 2004, 05:06 PM   #4
Hardi is offline Hardi  Germany
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Hi Tube_Dude,

the guy that tried the repair before soldered some 2N3055 as NPN type transisrors in the output stage. And i know that this is not correct . Some resistors "visually" do not fit in their pcb position...and so on....a real disaster

@Conrad:

I canīt find the ML3 there. Only ML2 and newer 23.5 !?


Hardi
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Old 21st September 2004, 08:53 PM   #5
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Quote:
Originally posted by Hardi
Hi Tube_Dude,

the guy that tried the repair before soldered some 2N3055 as NPN type transisrors in the output stage. And i know that this is not correct . Some resistors "visually" do not fit in their pcb position...and so on....a real disaster
Hi Hardi

Now i see...

For some information about the ML-3 see:

http://marklev.com/

2N3055 for a 200 W amplifier!!!...
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Old 21st September 2004, 11:23 PM   #6
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BAD REPAIR! Danger!
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Old 22nd September 2004, 10:02 AM   #7
djk is offline djk
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There are three different ML3 schematics, call the factory with the serial number.

They use MJ15011/12 outputs, 2N3584/2N6421 for predrivers.
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Old 22nd September 2004, 03:33 PM   #8
Konrad is offline Konrad  Norway
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Is there a "JC-4" or symetric with/-out j-fets?
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Old 6th August 2010, 01:47 PM   #9
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Hi Hardi,

I have the same problem with one channel.
Have you obtain finally the schematics ?
Can you send them to me in the case of yes ?

Thanks a lot by advance

Best regards

Jean-Paul
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Old 20th February 2011, 04:07 PM   #10
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Quote:
Originally Posted by john curl View Post
BAD REPAIR! Danger!
Why ?? Maybe cause unwanted oscillation effects by certainly load conditions? Then various simulation sessions of this circuit are necessary before starting any aimless service.

Quote:
Originally Posted by Konrad View Post
This URL is death in the meantime.
In which case was this URL mentioned? Are there online-schematic of ML-3?
I want to have all schematic versions.

here an auction from CH (Confoederatio Helvetica/Switzerland):
http://www.ricardo.ch/kaufen/audio-t...v/an628135428/
and pics from inside:
Mark Levinson ML-3 in excellent condition

Last edited by tiefbassuebertr; 20th February 2011 at 04:33 PM.
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