My guess is that it might be noisy. The springs look like they might have a resonant frequency and they might produce their own sound. But this is only my guess. It wouldn't be the first nor the last time I'm wrong. But, metal springs only held at one end is very suspicious to me. Marcel Carey > Date: Mon, 6 Jul 2009 12:21:18 -0400 > From: pianoguru at cox.net > To: pianotech at ptg.org > Subject: Re: [pianotech] Interesting action on Yamaha YUA > > ---- Ryan Sowers <tunerryan at gmail.com> wrote: > > A 1983 Yamaha YUA (52" upright) ..... The springs are > > flat, about 1/8" wide and do not engage the hammer butt until the hammer is > > about 5/8ths or so from the strings. > > I'm wondering if anyone else has had any experience with this style of > > action? > > I have studied the US patent for this action, (#3,946,635) issued 1976. I'm glad to see it was used in production and good reports of its performance. It doesn't appeared that it was used for very long. Does anyone know how long it was used? Or, if and why it was discontinued? > > Frank Emerson _________________________________________________________________ Internet explorer 8 aide à protéger la vie privée. http://go.microsoft.com/?linkid=9655573 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20090706/f366f338/attachment.htm>
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