Marshall, My experience with DamppChasers is that they reduce the effects of humidity events, but they don't completely eliminate them. So when the humidity goes up in the spring, pianos with DamppChasers will go sharp in the tenor and killer 8va, but not as far as a piano without the DC system. Decently scaled medium-size grands in my care (S&S M, L, O, Knabe 5'3", Yamaha C7) typically will float 2 to 5 cents. So the question is really "how far", not "how long". How long the tuning stays put depends on how far the piano floats, and how sensitive the owner is to that amount of pitch difference. Some of my DC-equipped grand owners tune annually and think it's just fine, others tune quarterly and would go more often if the budget would allow. YMMV, but for sure that piano would sound better, longer, with a DC. Mike On 1/14/2011 8:09 AM, Marshall Gisondi wrote: > Hi Everyone, > I also tune a Yamaha GA1 for a church, and I put them on a 3 month > schedule just to keep it sounding reasonable. I'm told that my > tunings stay longer than the last tech they had. Sometime last year > I had to replace a damper that one of the kids either from the school > they have or the youth group bent it. S o I had to get a new one. I > spoke with someone from Yamaha who said that these were faulty > pianos. How much longer will a damp chacer allow the tuning to stay put? > > Marshall Gisondi Piano Technician > Marshall's Piano Service > */pianotune05 at hotmail.com/* > 215-510-9400 > */www.phillytuner.com <http://www.phillytuner.com/> /* > Graduate of The School of Piano Technology for the Blind > www.pianotuningschool.org <http://www.pianotuningschool.org/> > Vancouver, WA > > > > > >
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