For what its worth: Levinson ML-9 schematic - diyAudio
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Old 1st July 2013, 10:53 PM   #1
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Default For what its worth: Levinson ML-9 schematic

I have never been able to locate a Mark Levinson ML-9 schematic. Attached is a schematic I whipped up in LTSPICE. I think its correct, but caveat emptor. Its just the main amp shown. Missing is the current limiting circuit at the bottom of the amp boards, slow start board, and rear protection board. This is a later model I think.

MPS-A64 in the schematic is MPS-U95 in the amp.
MPS-A14 in the schematic is MPS-U45 in the amp, and one is glued to the top of each TO-3 driver for thermal tracking.
1N4148 in the schematic is 1N914 in the amp.
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File Type: png ml-9.png (96.7 KB, 303 views)
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Old 24th March 2017, 08:55 AM   #2
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Thanks for very neat schematic.
The power supply voltage is +/- 75V?
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Old 24th March 2017, 11:27 AM   #3
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Yes. IIRC, the 2N3439 and 2N5416 are mislabeled (swapped).
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Old 24th March 2017, 12:53 PM   #4
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Thank you for your work!
Can you post asc file and library files for this amplifier?
Maybe we can try new devices and even a new clone.

Thank you in advance!
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Old 24th March 2017, 01:29 PM   #5
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I'll look for them. You can likely use MJE15032/33 or MJE15034/35 for the 2SC2336/2SA1006. The later series amps use these. The 2X, 33X, and 43X series amps are are evolutions of the same design with the later ones using the MJE15032/33 in a quadruple darlington setup.
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