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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Mark Levinson 26 pre-amp schematics
Mark Levinson 26 pre-amp schematics
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Old 30th September 2018, 12:52 PM   #1
Prime3p14 is offline Prime3p14  Netherlands
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Default Mark Levinson 26 pre-amp schematics

Hi fellow audio enthusiasts

I have drawn the schematics of my ML26 out of interest and it may be useful should I ever have to repair it I would like to share as it may be useful for others as well. Use at your own risk. It is correct to the best of my knowledge, some component type number were unreadable though, mostly diodes and a few transistors on heatsinks.

Greetings,

PrimeEvil
Attached Images
File Type: jpg ML26_Top.jpg (776.7 KB, 589 views)
File Type: jpg ML26_Opamp.jpg (993.6 KB, 605 views)
File Type: jpg ML26_Pos_regulator.jpg (661.6 KB, 565 views)
File Type: jpg ML26_Neg_regulator.jpg (661.6 KB, 514 views)
File Type: png ML26_PLS-226.png (146.6 KB, 534 views)
File Type: jpg ML26_Power.jpg (419.2 KB, 224 views)
File Type: jpg ML26_Gain.jpg (928.7 KB, 213 views)
File Type: jpg ML26_Select.jpg (1.00 MB, 217 views)
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Old 30th September 2018, 03:51 PM   #2
Hans Polak is offline Hans Polak  Netherlands
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Well done.
That must have been taken some blood sweat and tears.

Hans
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Old 30th September 2018, 05:51 PM   #3
Prime3p14 is offline Prime3p14  Netherlands
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Indeed, took me about 2 weeks, but it was a labour of love.
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Old 30th September 2018, 05:56 PM   #4
plasnu is offline plasnu  United States
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Could you upload larger version? Small letters are unreadable...
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Old 30th September 2018, 06:23 PM   #5
Prime3p14 is offline Prime3p14  Netherlands
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how's this? apparently the pictures got resized
Attached Files
File Type: zip ML26Top.zip (445.7 KB, 109 views)
File Type: zip ML26Opamp.zip (246.6 KB, 93 views)
File Type: zip ML26sub.zip (673.9 KB, 81 views)
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Old 1st October 2018, 04:15 AM   #6
plasnu is offline plasnu  United States
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Thank you so much. I had 26S long time ago. I have never expected to see the schematics while I live.
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Old 2nd October 2018, 08:18 PM   #7
PRR is online now PRR  United States
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>> larger version?
> pictures got resized


Click the "4 arrows" icon in the corner of the image. See attached. It gets BIG.

They are quite large: first is 1792x2800. Bigger than your screen. I have to open in new tab or copy-off to an image view program.

The images are JPEG. For line-drawings and text, GIF will not fuzz-up the small details to reduce file size; clean black/white GIF typically comes out smaller than any legible JPEG.

PNG is another option but has several modes which can result in quite different filesizes.

PDF is yet another, and PDF viewers typically have good pan/zoom features. Additionally they can bind the several pages into one file. But PDF encoders are not universal.
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File Type: gif plasnu-1.gif (16.8 KB, 163 views)
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Old 3rd October 2018, 12:03 PM   #8
Prime3p14 is offline Prime3p14  Netherlands
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Indeed I did upload as png, however somewhere in the process they got converted to jpg introducing the fuzz-up
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Old 3rd October 2018, 09:16 PM   #9
analog_sa is offline analog_sa  Europe
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Mark Levinson 26 pre-amp schematics
Prime,

Thank you very, very much. Sincerely appreciated!
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Old 3rd October 2018, 10:16 PM   #10
PRR is online now PRR  United States
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> I did upload as png, however somewhere in the process they got converted to jpg

Test of simple PNG attach --- it appears the forum software takes PNG verbatim.

I _do_ know what you mean. Another picture site takes my crisp GIF and JPEGs it.

Also browsers sometimes re-render an image at a different DPI.
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File Type: png 3-12ax7s.png (17.1 KB, 119 views)

Last edited by PRR; 3rd October 2018 at 10:22 PM. Reason: Observation of result
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