MarkLevinson ML3 schematics ?

Hardi · 21st September 2004, 03:39 PM

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

Tube_Dude · 21st September 2004, 04:03 PM

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?...

Konrad · 21st September 2004, 04:04 PM

http://home.kimo.com.tw/skychutw/index.html

Hardi · 21st September 2004, 05:06 PM

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 can´t find the ML3 there. Only ML2 and newer 23.5 !?

Hardi

Tube_Dude · 21st September 2004, 08:53 PM

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!!!...

john curl · 21st September 2004, 11:23 PM

BAD REPAIR! Danger!

djk · 22nd September 2004, 10:02 AM

There are three different ML3 schematics, call the factory with the serial number.

They use MJ15011/12 outputs, 2N3584/2N6421 for predrivers.

Konrad · 22nd September 2004, 03:33 PM

Is there a "JC-4"

or symetric with/-out j-fets?

JP0400 · 6th August 2010, 01:47 PM

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

tiefbassuebertr · 04:33 PM

Quote:

Originally Posted by john curl

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

http://home.kimo.com.tw/skychutw/index.html

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

21st September 2004, 03:39 PM	#1
Hardi diyAudio Member Join Date: Feb 2004 Location: Germany	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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21st September 2004, 04:04 PM	#3
Konrad diyAudio Member Join Date: Jun 2003 Location: way up north	http://home.kimo.com.tw/skychutw/index.html

21st September 2004, 05:06 PM	#4
Hardi diyAudio Member Join Date: Feb 2004 Location: Germany	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 can´t find the ML3 there. Only ML2 and newer 23.5 !? Hardi

21st September 2004, 11:23 PM	#6
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	BAD REPAIR! Danger!

22nd September 2004, 10:02 AM	#7
djk diyAudio Member Join Date: Feb 2001 Location: USA	There are three different ML3 schematics, call the factory with the serial number. They use MJ15011/12 outputs, 2N3584/2N6421 for predrivers.

22nd September 2004, 03:33 PM	#8
Konrad diyAudio Member Join Date: Jun 2003 Location: way up north	Is there a "JC-4" or symetric with/-out j-fets?

6th August 2010, 01:47 PM	#9
JP0400 diyAudio Member Join Date: Aug 2010	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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