Doug,
IIRC from my high school electronics class, you can use a higher wattage resistor, but do not want to use a lower rated one.
Ohm value, in this case 15, is what determines the resistance to the current. I'd try to stay close to this value.
And I assume (yea, I know....makes an...) the vendors would stock a replacement?
Two of these from Radio Shack, wired in series (end to end in a row, not side by side) would give you 16 ohms at 20 watts.
http://www.radioshack.com/prod...sp?productId=2062288
Or eBay has these exact matches:
http://tinyurl.com/l48ocs
http://tinyurl.com/l5mnxq
Larry
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