The mains transformer in my Logitech x540 has blown (oc on the primary). I've taken it out and its a simple single coil primary and secondary, but there are no markings on it to indicate the secondary voltage. Can you help?

Hi everyone. I'm the guy that had his logitech X540 system drowned in hurricane Irene. As a result of the unfortunate fact that my speakers never learned to swim, the transformer shorted out, which of course means no power. I tried logitech, and while they were sypathetic, they informed me that they could, (or WOULD ), not supply a replacement transformer. Next I tried e-mailing " CHINA EASTERN FRONTIERS LTD", ( the manufacturers of the transformer), of Hong Kong.... they would not respond.
Now here's the fix, and it works beautifully; (I'm listening to them right now). Call or go to Digi-key. thats www.digikey.com, or 1-800-344-4539, and purchase power source part number 102-1332-ND. You'll also need to buy the connecters and contact, ( about 2 bucks). the transformer is rated at 120 VAC input and 15 VDC @ 3A output. The installation requires you to drill 4 small holes somewhere in the speaker cabinet to secure the power source. when you install the unit be sure to locate it somewhere that you'll be able to access the connecters and also provide for air circulation.
Once installed, your speakers will function as good as new; perhaps just a tad louder.

You would need to rewind the coils.Do not try to do it by yourself if you have no idea what you are up-to...this time it was transformer next time it could it could be your circuit.Take it to a professional,the charges won't be much.
Good Luck.