Those aren't what compression "ridges" look like nor does a compression ridge mean the soundboard is out necessarily. A compression ridge is usually a single and slightly raised line along the grain, though there may be several compression ridges in a single panel. They usually run the length of the panel or a good portion of it. This looks more like a mottling of the finish. It's hard to imagine an 1898 soundboard has much left in it no matter what the circumstances, though. David Love davidlovepianos at comcast.net www.davidlovepianos.com -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Stéphane Collin Sent: Tuesday, June 20, 2006 11:03 AM To: Pianotech List Subject: Compression rigs Hi all. I join a picture of a 1898 Pleyel concert grand soundboard (close-up). Is this what you call compression rigs ? Does this mean that the board is out ? Thanks in advance for expertize. Stéphane Collin.
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