I have not used on much, and when I did it had reversed polarity. Here is one on Ebay
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=360021977634&fromMakeTrack=true&ssPageName=VIP:Watchlink:middle:us. At $30.00 minimum,used, is there a better way of going ?
Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact