It is my opinion that the damper spring on all Asian uprights si to bloody strong. There is no need and it does make the action heavy. Check blow,key dip/travel/level,l.o. checking. If the spring loops are intact see regualtion. Otherwise, loops first, reg after that. Others said it better Dale Dale Erwin R.P.T. Erwin's Piano Restoration Inc. Mason & Hamlin/Steinway/U.S. pianos www.Erwinspiano.com Phone: 209-577-8397 -----Original Message----- From: Ron Nossaman <rnossaman at cox.net> To: pianotech <pianotech at ptg.org> Sent: Sat, Dec 1, 2012 1:36 pm Subject: Re: [pianotech] Yamaha Uprights On 12/1/2012 10:50 AM, George Bartlett wrote: > Hi Folks, > Does anyone have any info on the cause of Yamaha Upright double striking > on soft playing. > George How old a piano? Back when I was doing dealer tuning on new Yamahas. this was very common, and always the same thing. The new owner, being unfamiliar with the piano, and/or new to music lessons, just wasn't completing the stroke. As they depressed the key, they would feel the damper pick up. Then, as they felt the additional resistance at the beginning of letoff as the jack tail contacted the letoff button, they'd let up and not push through letoff. The jack would then not clear the butt, and double striking was the guaranteed result. Once they were made aware of it and learned to complete the stroke to the bottom, the problem always magically disappeared. You can screw up the action by weakening damper and jack springs and widening letoff to accommodate, but the best fix is teaching them how to work the action. That's with a new or fairly new piano. If it's an older instrument that's badly out of regulation, start with that. Ron N -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20121201/158bf507/attachment.htm>
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