Avery, The most common cause I have seen for grands with unstable unisons in the top 2 octaves has been poor string rendering. Look at the string path from tuning pin to v-bar to see what is causing the string to hang up. Some possible solutions: Protec, heavy test blows, finding an effective hammer technique. The piano owner should be told that regular tunings by the same technician will also minimize the instability. Mike Avery Todd wrote: > List, > > I just had a call about a Boston GP193 (7' ish) that's app. 10 yrs. > old with a persistent tuning problem in the upper 2-3 octaves. The > unisons won't stay in tune. The owner has checked with several > technicians & one even told him that the problem was inherent in that > age of that piano & that there's no fix for the problem that he'd > heard about. Newer versions no longer have the problem, he said. > > I've never run across that particular one and have never heard of this > (I've tuned very few Bostons). Has anyone else? Does anyone know of a > "fix" for this problem, short of a redesign/rebuild? The piano is in a > fairly large church and they now are planning on getting rid of it > because of this problem. They don't really want to because they love > the touch but they use it in a recording studio and it's "driving them > crazy"! > > Any help would be appreciated. Thanks. > > Avery Todd, RPT > Houston, TX
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