While not exactly the same design, you might be able to find some worthwhile tips in these two threads. Sean
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http://forum.audiogon.com/cgi-bin/fr.pl?htech&1001889380&read&keyw&zzthreaded=rod
http://www.audioasylum.com/audio/general/messages/201048.html
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http://forum.audiogon.com/cgi-bin/fr.pl?htech&1001889380&read&keyw&zzthreaded=rod
http://www.audioasylum.com/audio/general/messages/201048.html