RE: Vintage preamp - Mark Levinson ML-1 & power supply - stellavox

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RE: Vintage preamp - Mark Levinson ML-1 & power supply

Posted by stellavox (A) on March 23, 2020 at 08:28:57

In Reply to: Vintage preamp - Mark Levinson ML-1 & power supply posted by Shingeaux on March 20, 2020 at 14:08:22:

Pretty familiar with the ML-1 (and the LNP2) having repaired a few and built up two from bare mother boards and cabinets gotten from an ex ML engineer.

The modules contained way more than 10 parts and actually had a plug-in pattern consistent with other discrete op-amp modules used in pro mixing boards.

There were two op-mp modules per channel, a post-regulator board (on the right side as I remember) and space for a (rare) moving coil pre-preamp/step-up module on the left side. The RIAA feedback circuitry was also on smaller plug-in boards near the front end preamp module. I'm in exile on a bayou south of Savannah far from my NY home schematics but remember that the gain without the step-up module was in the 40s of DB with the step-up adding another 20 or so. There were two DIP switches on the feedback boards, one set cartridge loading (47K and something else) and the other gain (30/40 something).

Having also a LNP motherboard with no modules, I built up plug-in modules using really good op-amps and along with a friend got both units going again. They sound quite good - I'd suggest listening to yours and see what you think!!

Charles

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Follow Ups Full Thread

Topic - Vintage preamp - Mark Levinson ML-1 & power supply - Shingeaux 14:08:22 03/20/20 (13)

RE: Vintage preamp - Mark Levinson ML-1 & power supply - stellavox 03/23/2008:28:57 03/23/20 (0)

RE: Vintage preamp - Mark Levinson ML-1 & power supply - fredtr 07:04:06 03/22/20 (3)

Those modules ARE potted - airtime 07:50:28 03/22/20 (2)

RE: Those modules ARE potted - fredtr 07:57:32 03/22/20 (1)

RE: Those modules ARE potted - DaveV 08:34:21 03/22/20 (0)

RE: Vintage preamp - Mark Levinson ML-1 & power supply - Shingeaux 12:57:31 03/21/20 (1)

I'd love to buy some of the modules. :-) (NT) - Kal Rubinson 15:28:26 03/21/20 (0)

RE: Vintage preamp - Mark Levinson ML-1 & power supply - fredtr 12:06:54 03/21/20 (0)

30 years? - bare 10:09:22 03/21/20 (0)

Me personally - I wouldn't touch it - airtime 07:29:22 03/21/20 (2)

RE: Me personally - I wouldn't touch it - KanedaK 23:58:52 03/22/20 (1)

The problem is scoping it out and testing - not just popping in a cap or two - airtime 07:35:50 03/23/20 (0)

RE: Vintage preamp - Mark Levinson ML-1 & power supply - DaveV 19:18:51 03/20/20 (0)

Follow Ups

RE: Vintage preamp - Mark Levinson ML-1 & power supply - stellavox 03/23/2008:28:57 03/23/20 (0)

RE: Vintage preamp - Mark Levinson ML-1 & power supply

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