<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=us-ascii"> <META content="MSHTML 6.00.2600.0" name=GENERATOR></HEAD> <BODY> <DIV>Good screwing of the plate have shown 3 cts raise and = more.</DIV> <DIV> </DIV> <DIV>Isaac OLEG</DIV> <BLOCKQUOTE dir=ltr style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px = solid; MARGIN-RIGHT: 0px"> <DIV class=OutlookMessageHeader dir=ltr align=left>-----Message d'origine----- De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la = part de Donald Mannino Envoyé : lundi 23 = septembre 2002 05:42 À : Pianotech Objet : Re: = Yamaha Tuning Instability </DIV>Terry, There are = always so many factors involved with tuning instability, it's really hard to = solve something like this.  In addition to what others have written, = keep in mind the following generalizations, which might be contributing factors: - A smaller soundboard tends to react less to humidity = changes than a larger one. - An old soundboard tends to react less to = humidity changes than a new one. The pinblock gap at the plate flange is = not likely to be the issue, as Yamaha grand pinblocks in the past were not = fit to the flange.  Some pianos would go together with some contact, but = many  did not contact the flange at all.  Same is true for = Kawai, by the way.    I believe Yamaha later changed to doing a = resin fit, but I am not sure what they are doing now.  In any case, = these pianos usually hold tuning just fine without having the pinblock fit = to the flange. If you are going to wedge the gap, I would recommend = lowering tension and tightening the plate screws first. Have you not = already tightened the plate screws?  If not, it might be good to simply = do that and see how the piano holds before taking more elaborate = steps. Don Mannino RPT At 06:26 PM 9/22/2002 -0400, you wrote: <BLOCKQUOTE class=cite cite="" type="cite">My son's piano = teacher has a 1983 Yamaha G5 (6' 7") grey market piano. Other than tuning instability, = the piano is in VERY good condition. She also has a 1930ish Aeolian = 4'some" microgrand in the same room. I have tuned both pianos several times = at six month intervals. The Yamaha consistently goes out of tune = significantly more quickly than the microgrand. No RH monitoring and no DC (on either = piano). The Yamaha does have business card gaps between the pinblock and the = flange. I will be servicing both these pianos two weeks from = now. I plan to check the rim screws and pinblock/flange fit on the Yamaha. = I will shim any pinblock/flange gaps I can find. She is going to start = monitoring RH in the room. But keep in mind, the Yamaha goes much more quickly = out of tune than the microgrand. Any other suggestions for things to look = for? This is a significant problem for this piano owner. I need to solve it. = Any input will be greatly appreciated. Thanks. Terry = Farrell   _______________________________________________ pianotech = list info: <A href="https://www.moypiano.com/resources/#archives" eudora="autourl">https://www.moypiano.com/resources/#archives</A> = </BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>