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Mark Levinson ML-1 power supply

I recently purchased some vintage audio gear at an estate sale auction. One piece of gear was a Mark Levinson ML-1 solid state preamp, which dates from approximately '77 to '80. Unfortunately, the external power supply was not included. Thus far, I've been unable to find a replacement online. I'm hoping something eventually pops up on eBay. In the meantime, I'm thinking of building a quality power supply so that I can actually make use of the preamp until I find the real deal online.

I have experience with a soldering iron building speakers and can follow (though not design) a schematic. I've never dealt with power supplies before and don't know the first thing about them. Mark Levinson tells me that the power supply was plus or minus 15V, 500mA each rail. They weren't sure of the pin configuration, and the connector is a bit of a mystery as well.

Any suggestions or insights on where to start would be greatly appreciated. Thank you very much.
yamezxx

Showing 2 responses by almarg

almarg's avatar
almarg
9,670 posts
 
It may be helpful for you to know that the model number of the power supply is PLS-150.

You can find pictures and further information here:

http://www.marklev.com

I doubt that the present Mark Levinson/Harman International company will be of much help. They probably no longer have the parts to repair that power supply, much less a complete supply. I know for a fact that they no longer have replacements for the potted phono amplifier and line amplifier modules which are in the preamplifier section of the ML1, and replacements for those modules are essentially impossible to find without buying a complete ML1 (which are highly collectible and go for $2K to $4K on eBay).

And speaking of the amplifier modules, which understandably do tend to develop problems after their 3 decades or so of existence, I would suggest not investing too much money in a power supply given that you have no way of knowing if the preamplifier section itself is working.

You may want to consider the possibility of selling it as is, and using the likely substantial amount of money it would bring to buy something newer.

Best of luck with it!
-- Al
almarg's avatar
almarg
9,670 posts
 
Assuming that the description is accurate, "DC CABLE for Mark Levinson PLS-151 Preamplifier Power Supply," that is what you want. It wouldn't say "DC" if it was referring to the power cord to the wall.

It's taken a lot of patience, but it sounds like you're just about there! Enjoy.

Regards,
-- Al
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