Years ago, Yamaha paid me to restring a P-22 because of string breakage. They supplied me with a full set of new wound strings, sized differently and that ended the problem. Schaff can do the same. James James Grebe Est. 1962 Piano Tuner-Technician Creator of Custom Caster Cups Creator of Fine Writing Instruments Piano benches Theatre and Theatre Organ Historian www.grebepiano.com 1526 Raspberry Lane Arnold, MO 63010 (314) 608-4137 ----- Original Message ----- From: "David Love" <davidlovepianos at comcast.net> To: <pianotech at ptg.org> Sent: Saturday, January 08, 2011 1:04 PM Subject: [pianotech] Yamaha Upright String Breaker > I've got a Yamaha studio upright that continues to break strings at D3 > (wrapped bichord). The speaking length is 890mm, the core wire 14 gauge > and > the outside wrapped dimension is .058". My spread sheet shows that at 69% > BP but my own formula might be low. Any string makers care to input here? > It seems to me it's got to be too high. > > David Love > www.davidlovepianos.com > > >
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