Mark Levinson ML-1 power supply

You might check with Calex, who makes high quality AC/DC linear power supplies +/-15V up to 500mA.

http://www.calex.com/ACDCPowerSupplies.html

Thanks. Calex got back to me (quickly!) to say they don't manufacture external power supplies.

Joe, I only had contact with the company through my local repair shop, so they may be more helpful when I call this week to confess my ignorance. That's not really a comment on your complaint. I just don't have an opinion one way or the other yet.

I'm relatively new to owning higher end audio gear. I've built several pairs of speakers before, using others' designs. But I've only been out of grad school for about four years, so until now I couldn't afford much beyond the gear I've had since high school.

In the same auction, I ended up with an old Bryston amp (4B NRB) and preamp (0.5B). The amp had one dead channel, which is the risk of buying at auction. Much to my amazement, Bryston honored its 20-year warranty and fixed it. All it cost me was some shipping. Incredible! Bryston made a fan for life with that surprise. Mark Levinson now has the same opportunity... :)

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

I built a PS for a JC-2 but the schematics are on the ML site. The only difference between the ML-1 and the JC-2 is the power supply so you could probably use one made for the JC-2. Seems like it used a 4 pin XLR. The circuit board should have the pin configuration.

The Calex AC/DC supplies require simply soldering a fused AC power cord to one end, and soldering DC application to pin connections at the other. They are potted units that would ideally be repackaged in a DIY enclosure with umbilical to ML. Talk to one of their techs by phone if you want the straight story.

Allied Electronics, Burson audio, and others have similar PCB solutions for use in DIY enclosures; Calex has a particularly clean spec.