Ric, My oberservations are that DCs do help, more with an undercover, and a whole lot more with a stringcover. I have two Sauters here, one a Delta and one an Omega. The Delta has a stringcover, the Omega doesn't. We just had a big swing here with dry arctic weather. The Omega needs unison cleanup and the Delta doesn't know anything happened; it is going on over four months with a pretty near concert level tuning still surviving on it. Andrew Anderson At 01:47 PM 3/8/2007, you wrote: >Hi Don > >A couple things to remember... these are all based on same size wire >0.9 mm (seemed like a good average) and short back lengths. Still >they give a good enough picture. Longer back lengths end up >requiring even larger deflection changes for any given pitch change, >but downbearing levels are lowered. Still... no soundboard/bridge >is going to rise 5 + mm me thinks. > >I am also curious as to why damppchasers have an obvious positive >affect. Obviously wood is involved. In grands however... I cant >see the bridge itself being to awfully much affected by the DC unit >(perhaps I am wrong). And the bridge is where most of my attention >is focused on this issue at the moment, for a couple 3-4 reasons as >I've stated in other posts. > >Rim, pinblock, and frame could all conspire to alter the end points >somewhat. I still dont quite get why this should effect the lowest >tenor strings sooooo much more then others. > >btw... it always seems to me like there are 4 independent sections >and they all respond pretty similarly to each other. Pitch drops >most in the lowest notes of each section. The bass and top >sections behave a little differently then the middle to... but not >all that much. That points me back to the bridge..... grin. > >Cheers >RicB > > > Hi Ric, > > Most interesting figures. I've not believed soundboard moving up and > down > had much to do with pitch corrections for some years. > > What I *do not* understand is *why* damppchasers work to ameliorate > seasonal pitch change. Clearly they don't have much effect on metal. > That > leaves the rim and the main frame as possibilities.
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