---------------------- multipart/alternative attachment >& Many of them sound very nice. And many of them don't sound anywhere near nice. Nice compared to what, a fifty year old Poole spinet? In my opinion, it's more a double standard of not holding them to similar standards of sound production as grands that makes these old uprights sound good. As in : very nice... considering... and better than I expected. >Ron--As with many double standards the difference is econmics which is the case between Grands & uprights. A grand is always about 3 times as expenseive which means the upright got about 3 times less of something. >In my mind the upright soundboard is more of a mass driven system. I.e. >long strings and big soundboards. These boards are tapered, thicker at the >top in the treble & gradually thin down to about 1/4" near the bass/ >bottom end for flexibility. If it's a mass driven system, why the attention to flexibility differences between the bass and treble? Where's the mass component that's any different from grands? >> What I mean by this statement was a take off to what Jean- Jacques original post was about ,in that the soundboard doesn't require bearing & crown to have the strings energy transferred to it, just coupling. The mass component I refer to is the stiffness & mass of the soundboard panel & ribs but minus the crown & bearing squash for additional stiffness. > I recently put bridge caps on one of the first Baldwin Uprights > (1880) ever built. (Gorgeous looking & sounding) The board was flat as a > pancake. I shimmed hairline cracks and then applied scraped off the old > varnish and epoxy finish treatment to the front of the board. This is an > amazing sounding piano. I really think that the hardness of the epoxy > finish is also a contributing tonal factor. > Food for the new year. > Dale Erwin >>>>> Notice I didn't say very nice,considering or better, I said amazing. The flat board was set up with some bearing but not that much. The tonal improvements come primarily from (some) bearing and tight bridge pins in maple & new strings of course. Not very filling. Again, stiffening the board with epoxy "contributed to the tonal factor", but it's still somehow a mass driven system that was designed to be without crown or bearing. I'd like a little gravy with these grits please. Ron N >>OK I'll go that one with you but If the epoxy added any additional stiffness to the board then would it not improve tonal output? However I won't bet on the ponies with this one. Mainly this piano sounds good because of superior American Cra(P)ftsmanship.grin Regards--Dale Got a good storm going out here today & its coming your way ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/4f/f3/29/48/attachment.htm ---------------------- multipart/alternative attachment--
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