If I check with my calculations in the past: for the same gauge on the same speakinglenght the tension is about O,5 kilogram stronger for pure sound compared with Röslau. I don't know exactly about the yieldingpointdifference. Also to ad that puresound gets better in sound ( even more clear and singing) after six months one year: Juan told me something is changing in the structure. Also the stability of the first pitchraises and final tuning are much better. I forgot, : heard a rumour from a friend in Poland that the sound was dead after 5 years and the piano had to be restrung, did somebody already expierence this same dissaster with puresound? Friendly greetings, Danny Boddin , Ternat Belgium. ----- Original Message ----- From: "Phillip Ford" <fordpiano@earthlink.net> To: <pianotech@ptg.org> Sent: Monday, July 22, 2002 7:55 PM Subject: RE: Stainless Steel Wire > > > > > > The wire is used mostly because of the less tension it > > needs , and because of the mellower sound it gives. > > > > > > > > > >Lowering tension with normal piano wire will have a "mellower > > >sound". There may well be some difference but you cannot compare > the sound > > of two wires at different tension. ALL parameters have to be as > close as possible to get a > > >valid comparison. > > > > > I don't understand why this stainless wire should require less tension. The > density and young's modulus of stainless steel should be very close to carbon > steel. As I see it, if you want to lower tension when using this stainless > wire, assuming you are not changing speaking lengths, then you would have to > use a different gage than was originally there. Making tone comparisons after > a change like this seems a dicey proposition. You're comparing apples to > oranges. Perhaps this is the same thing that Newton was saying. If so, my > apologies for reiterating. > > Phil F > > > > > Phillip Ford > Piano Service & Restoration > 1777 Yosemite Ave - 215 > San Francisco, CA 94124 > >
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