Original poster: "Christoph Bohr by way of Terry Fritz <teslalist@qwest.net>" <cb@luebke-lands.de> one short question: I had my coupling adjusted when I had a 30nF primary cap. Will this be still OK if I change to 60nF or more primary capacitance or will I have to decrease coupling due to higher excitation with bigger bangsize? any help welcome Thanks Christoph