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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