Chris, The sort of it is - yes. In raising the pitch that much, even though the hammers are grooved, you are changing where the string and the hammer head meet so, in other words, especially in the wound strings, the windings in the grooves have changed position. I always recommend hammer shaping when the hammers are grooved. Duaine Christopher D. Purdy wrote: > Yesterday I pitch raised an old upright over 100 cents. The tone of > the piano went from slightly bright to very dull. I have seen this > happen before on a few unisons or maybe one section but in this case > the entire piano is now very dull sounding. What causes this? The > hammers are grooved, does the pitch change somehow change the string > plane or spacing? > > chris -- Duaine Hechler Piano, Player Piano, Organ, Pump Organ Tuning, Servicing & Rebuilding Associate Member of the Piano Technicians Guild Reed Organ Society Member St. Louis, MO 63034 (314) 838-5587 dahechler@charter.net
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