<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1141" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Ron, that's one of the best things I've = read from you, and they're all good.</FONT></DIV> <DIV><FONT face=Arial size=2>Kevin</FONT></DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=RNossaman@cox.net href="mailto:RNossaman@cox.net">Ron = Nossaman</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">Pianotech</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, March 07, 2003 = 7:28 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Yamaha U1 = regulation problem</DIV> = <DIV><BR></DIV><BR>>        &n= bsp;    I know bobbling hammers can be a problem on Yamaha verticals <BR>> = and I ve worked on hundreds of these, but I can t shorten blow any more = <BR>> and as I mentioned, keydip-aftertouch are correct. I m hesitant to <BR>> = increase lettoff back to its original excessive amount, so esteemed <BR>> = colleagues ---Any suggestions? I m going back next week.<BR><BR>This has always = been a problem with these actions with beginners, kids, and <BR>folks with a tentative touch. To me, it seems to be a design thing. The <BR>ratio = of jack length to tail length is high, so any drag of the jack at the <BR>but translates to increased resistance at the tail. As the key is = <BR>depressed, the pianist picks up resistance from the damper spring first, <BR>then = hits added resistance at letoff. They just don't push through the = <BR>letoff and finish the stroke, which makes the hammers bobble. Bottom line <BR>is = that the person playing the piano needs to learn how to work it and the = <BR>"problem" goes away. Since that isn't likely to happen immediately, I find = <BR>the quickest and most easily reversible cheap trick is to bend the letoff = <BR>rail brackets down a tad to make that letoff about 1/4" - maybe more. There = <BR>will be a point where even the most relentless and determined soft = paw <BR>won't be able to make the hammers bobble. That's where to leave = it. Feels <BR>funny? No power, no control? No sweat. If they were capable of = power and <BR>control, the problem wouldn't have come up in the first place. = Next year, <BR>when they've learned to work the piano and complain about the lack = of power <BR>and control (or not), these same brackets can be bent back = up to get the <BR>letoff close enough to even it out quickly without having had = to crank all <BR>the buttons down, then up again. Sure, I hate to compromise = the action to <BR>accommodate someone's inability to work it, but they aren't = going to change <BR>until (and if) they change, so all that's left is = minimizing the damage <BR>until, and if, they do.<BR><BR>That's my take.<BR><BR>Ron N<BR><BR>_______________________________________________<BR>pianotech = list info: <A = href="https://www.moypiano.com/resources/#archives">http://www.ptg.org= /mailman/listinfo/pianotech</A></BLOCKQUOTE></BODY></HTML>