> Agreed. My speculation is that it is at best very little of the major > components that cause truly massive seasonal shifts in, e.g. spinets. > Not that we care so much about stability of these pianos, but they are > maybe worth looking at more closely just for the mechanics. Here in > Chicago, among my clientele (and yes, I still tune a few spinets), these > pianos move regularly between 435 and 445 even with my attempts to > "float" the pitch. The older they are, the more "volatile" they get. Is > this pinblock movement? Maybe to some wee degree. But I can't believe > that it would account for the large-scale pitch movement. I unfortunately still tune a few spinets too, and can sympathize. I also doubt that pinblock movement could make that kind of difference, but I still think it's contributory. > All true. Especially the voodoo. Until we have data, that is. And yet, > there is still measurable bearing change at the bridge from season to > season. This in no way argues for "rise and fall" but certainly some > movement of the major structures that correlates with pitch. It could be > any and all (I suspect the latter) of the things you mention above, > although there are some forces which oppose rather than complement. I'd say all, to infinitely varying degrees. Ron N
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