David, It is common for pianos to fall. Are you tuning it sharp at all? Are you setting back pressure when you set the pin? This is not a lot to fall so just stay with it and keep on giving your piano room to fall. William ----- Original Message ----- From: <pmc033 at earthlink.net> To: <pianotech at ptg.org> Sent: Sunday, June 14, 2009 5:53 PM Subject: Re: [pianotech] New Asian piano that will not hold a tuning > Hi, David: > You didn't mention what the environment of the piano is. Is this an > institution, or a home? Heating duct under the piano? Damage? Direct > sunlight? Somebody secretly using it for tuning practice? Here in San > Diego, basically the same climate as LA, most folks tune once a year. > Even > in a year, such changes would be unusual. > As far as structural changes, I'd look and see how the plate flange and > block are fitted. Is there a large gap in there that indicates that the > pinblock isn't tight against the flange? > 80-90 cents flat in the treble is an awful lot in six months, as well as > the other percentages you mentioned. I would expect some slippage, but > this is a lot overall. I've tuned Samicks, which we used to sell in the > 80's and 90's, that didn't have this much trouble. Three pitch raises in > less than a year ! > Puzzling.. > > Paul McCloud > San Diego > > >> [Original Message] >> From: David Trasoff <david at davidtrasoff.com> >> To: <pianotech at ptg.org> >> Date: 06/14/2009 2:31:52 PM >> Subject: [pianotech] New Asian piano that will not hold a tuning >> >> I am wondering what ideas or experience people have concerning the >> possible reasons a new Korean-made piano seems to be incapable of >> holding pitch. It's a 5'3" Samick-made grand. It was tuned prior to >> delivery in early September 08 (I assume it was; I didn't do it). When >> I gave it its post-delivery service in September it had slipped >> 30-40¢. I pitch-raised and tuned it. >> >> By December the customer was complaining; I made another service call >> and found the piano again 30-40¢ flat. I again double tuned it (using >> the RCT pitch raise function) and left it on pitch. I tuned the piano >> again in the beginning of June and found the bass about 25¢ flat, the >> midrange from 10-15¢ flat to on pitch, and the high treble 80¢ or more >> flat! It seems pretty obvious that something is moving around in >> there, a bad glue joint in the frame? an improperly secured plate? >> >> I don't have the luxury of going back and making measurements or >> poking around (I'm not being paid to do that), but I'm interested in >> what other technicians think may be going on with this piano. I've >> recommended to the store that sold the piano that it be replaced, but >> I'd like to have some possible technical points regarding the apparent >> failure in the structure of this piano to discuss. >> >> Thanks, >> David Trasoff >> >> --- >> David Trasoff >> Professional Piano Service >> 4130 Verdugo View Drive >> Los Angeles, CA 90065 >> Tel: 323-255-7783 >> Fax: 323-313-1519 >> david at professionalpianoservice.com >> >> >> >> >> > >
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