Roberto, >I had to raise half step the pitch of an upright piano today. >The owner asked me how many kilos (or tons)the tension increase >in that case . A half step pitch raise would increase the tension in the neighborhood of 5 to 6%. (12th root of 2). The general neighborhood of tensions is 18-22 tons (~16.300 to 20.000kg) others on list more knowledgeable...;-O Conrad Conrad Hoffsommer Office - (319) 387-1204 Luther College Music Dept Fax - (319) 387-1076 700 College Drive hoffsoco@luther.edu Decorah, Iowa 52101-1045 Certified Calibration Technician (CCT) of Digitally Activated Offgrid Tone Generation Systems "If you have to plug it in, or you can't watch how it works, I don't work on it."
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