---- 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
This PTG archive page provided courtesy of Moy Piano Service, LLC