---------------------- multipart/alternative attachment David N. Said: "Many old pianos were designed to be tuned to A=435, and bringing them up to 440 adds more tension than they were designed to take, but thankfully, it's not a whole lot more, and most of them can take it. But on some of them, there's a risk of breaking a lot of strings or the soundboard or even the plate. " --David, I disagree with this statement. To tune a "435" piano to 440 will add, (average), approx. 5 lbs tension per note. This is so miniscule that it should never push the strings/plate/structure beyond it's limits. Most Plates are waaaayyyy over engineered, (my guess is twice what it has to take.) Almost all string scales never exceed 55-60% of the breaking strength of the wire. And that would be on a "tightly" designed piano, which, to my knowledge, there are NONE! I am speaking of that period that is supposed to be in the "International Pitch" era. There is one piano, (a European name that escapes me at the moment), that had a very lightly engineered plate. That one, although it was purportedly designed for a pitch HIGHER than 440cps, broke plates on a regular basis! Your statement smatters of "Urban Legend".<G> Regards, Joe Garrett, R.P.T. (Oregon) Captain, Tool Police Squares R I ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/e6/e1/a9/b8/attachment.htm ---------------------- multipart/alternative attachment--
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