Now THAT *IS* a good question I hadn't thought about, and a bit depressing as well! That might explain tonal variations from season to season, as well as the frequent "voicing" changes that the good pianist are so sensitive to. John ---- Original message ---- >Date: Thu, 18 May 2006 11:05:14 -0600 >From: "Jim Busby" <jim_busby at byu.edu> >Subject: RE: [CAUT] Pinning - was; rehearsal room climate swings >To: <jminor at uiuc.edu>, "College and University Technicians" <caut at ptg.org> > >Hi John, Ron, > >How does that (RH swings) affect your center pinning?? When could you >effectively repin? Pinning during low RH may cause the pins to seize up >during high RH, and loose pinning might occur with the opposite >scenario. > >I recently repinned an M during 45%RH and when it went down to 20% my >5-7 grams went to 2-4 grams! (For you "swingers" it went from about 3-5 >swings to 7-10 swings) Not only did this cause rep spring problems but >the sound of loose hammer pinning is different than good pinning. (Chris >Robinson/Rick Baldassin did some spectrum studies which verified this.) > >This is a concern I've had which I don't remember ever being addressed. >I've just tried to "get by", but there must be some pinning wisdom out >there that I'm missing. > >Regards, >Jim Busby BYU > >-----Original Message----- >From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of >John Minor >Sent: Tuesday, May 16, 2006 1:23 PM >To: caut >Subject: [CAUT] rehearsal room climate swings > >I've been fighting wide swings in temp/humidity in university >buildings for 13 years now and the tuning stability seems to >get worse each year. One of our buildings recently underwent >HVAC updates and the air exchange is now much more rapid that it >ever was. I suspect this constant high volume flow of outside >air around the pianos has a great deal of destabilizing effect. > >Has anyone tried using Edwards String Covers to shield the >pianos from all that airflow? > >Any ideas? > >John Minor >University of Illinois > >The 2 images are from a DICKSON DATA LOGGER tucked under the >soundboard of a Steinway B in large rehearsal room. It was set >to log hourly readings.
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