Check this... its the nearest specs I've found... Good Luck.
http://cgi.ebay.com/AC-DC-Adapter-110-220VAC-to-1-5-3-4-5-6-7-5-9-12VDC_W0QQitemZ200415259300QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2ea9ae2aa4

Anonymous

2992 Answers
Posted on Mar 06, 2010

SOURCE: need to buy a power supply

As far as I know, this needs a pretty standard 1-amp 12 volt adapter. Radio Shack is probably your best place to find one since they have a supply with interchangeable tips. That way you can find the one that matches the speaker power jack. (If you're not in the US, you can check local electronic supply stores for a suitable replacement.)

Grand Canyon Tech

3867 Answers
Posted on Apr 22, 2010

SOURCE: I can't find my adapter (12v yamaha-model-yst-m7)

I found a website with some replacment ac adaptors if this helps.
http://www.amazon.com/s/?ie=UTF8&keywords=yamaha+ac+adapter&tag=yahhyd-20&index=aps&hvadid=17743436511&ref=pd_sl_2bq6e7avn9_b

please do leave your feedback before you leave, thanks

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

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