<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style></style></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1>This can definitely be a problem and not just on Asian uprights.  Recently had this on a new Schimmel upright.  Good regulation but the damper springs were so strong that it really altered the touch response and double hitting was common.  Adjusted the tension and the problem went away.  <o:p></o:p><o:p> </o:p>In response to Ron’s posting, while telling the pianist that they simply have to push harder through let-off will solve the problem, as a pianist, one should not have to think about pushing through let-off in order not to get double hitting.  If the pianist is reacting to a dramatic change in the touch resistance through the stroke enough to prevent or stop them from pushing through let off, then there is something wrong with the regulation.   While I don’t think changing the jack spring tension should even be considered (I’ve never seen this as a cause of the problem and reducing the tension there can prevent the jack from resetting properly), excess damper spring tension can definitely create this problem.  Moreover, it can negatively impact the overall feel of the action.  A similar problem can happen when installing new grand back actions if you regulate the damper under lever springs with very high tension to insure fast shut-off.  <o:p></o:p><o:p> </o:p>The problem, of course won’t be there when the damper pedal is in use.  One way to test to see if that is the problem, in fact, is to depress the damper pedal and hold it down while playing softly.  If the problem goes away then the damper spring tension is the likely source. <o:p></o:p><o:p> </o:p>David Love<o:p></o:p>www.davidlovepianos.com<o:p></o:p><o:p> </o:p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Dale Erwin Sent: Saturday, December 01, 2012 3:37 PM To: pianotech@ptg.org Subject: Re: [pianotech] Yamaha Uprights<o:p></o:p></div><o:p> </o:p>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. <o:p></o:p><div> Check blow,key dip/travel/level,l.o. checking.<o:p></o:p></div><div> If the spring loops are intact see regualtion. Otherwise, loops first, reg after that.<o:p></o:p></div><div>Others said it better<o:p></o:p></div><div>Dale<o:p></o:p><div>Dale Erwin R.P.T. Erwin's Piano Restoration Inc. Mason & Hamlin/Steinway/U.S. pianos <a href="http://www.Erwinspiano.com">www.Erwinspiano.com</a> Phone: 209-577-8397 <tt><o:p></o:p></tt></div><div><div id="AOLMsgPart_0_6f1cc67e-6e7d-4732-84d5-b4f7be4fd178"><pre style='background:white'><tt><o:p> </o:p></tt></pre><pre style='background:white'><tt>How old a piano?<o:p></o:p></tt></pre><pre style='background:white'><tt><o:p> </o:p></tt></pre><pre style='background:white'><tt>Back when I was doing dealer tuning on new Yamahas. this was very <o:p></o:p></tt></pre><pre style='background:white'><tt>common, and always the same thing. The new owner, being unfamiliar with <o:p></o:p></tt></pre><pre style='background:white'><tt>the piano, and/or new to music lessons, just wasn't completing the <o:p></o:p></tt></pre><pre style='background:white'><tt>stroke. As they depressed the key, they would feel the damper pick up. <o:p></o:p></tt></pre><pre style='background:white'><tt>Then, as they felt the additional resistance at the beginning of letoff <o:p></o:p></tt></pre><pre style='background:white'><tt>as the jack tail contacted the letoff button, they'd let up and not push <o:p></o:p></tt></pre><pre style='background:white'><tt>through letoff. The jack would then not clear the butt, and double <o:p></o:p></tt></pre><pre style='background:white'><tt>striking was the guaranteed result. Once they were made aware of it and <o:p></o:p></tt></pre><pre style='background:white'><tt>learned to complete the stroke to the bottom, the problem always <o:p></o:p></tt></pre><pre style='background:white'><tt>magically disappeared.<o:p></o:p></tt></pre><pre style='background:white'><tt><o:p> </o:p></tt></pre><pre style='background:white'><tt>You can screw up the action by weakening damper and jack springs and <o:p></o:p></tt></pre><pre style='background:white'><tt>widening letoff to accommodate, but the best fix is teaching them how to <o:p></o:p></tt></pre><pre style='background:white'><tt>work the action.<o:p></o:p></tt></pre><pre style='background:white'><tt><o:p> </o:p></tt></pre><pre style='background:white'><tt>That's with a new or fairly new piano. If it's an older instrument <o:p></o:p></tt></pre><pre style='background:white'><tt>that's badly out of regulation, start with that.<o:p></o:p></tt></pre><pre style='background:white'><tt>Ron N<o:p></o:p></tt></pre></div></div></div></div></body></html>