I have not seen a GA1 recently thank goodness, but the design of the piano model's scale is the problem. Don't waste your time with the plate/pinblock mating. I can recall coming to GA1's repeatedly whose tenor had changed 45 cents with the change of seasons. I suspect the tenor changed more than twice as much as in any other piano I have seen. There is no way these pianos are going to stay in tune. Sorry, Kent Swafford On Jan 13, 2011, at 3:38 PM, Claude M. Harding wrote: > A church near me has a small grand (Yamaha GA1) that doesn't stay in tune very long. The temperature is kept between 60 & 80, and the piano has a > Dampp-Chaser heat bar and humidistat. > > Two other competent tuners have also tried to tame this little beast without much success. The last time I tuned it (Aug. '10) I pulled the action and checked the > mating of the pinblock and plate flange. I used my 6-in. metal ruler (.018" thickness) and found gaps between the pinblock and plate flange from F#3 to A#4 and also > from B6 to A#7. The plate flange ended at A#7, so I guess the top "gap" runs from B6 to the treble inner rim where the pinblock is fastened. > > How likely is it that this is the source of the instability. If so, do you have any suggestions for improving the situation, short of a rebuild, which is not likely to happen. > Thanks. > > Claude Harding -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20110113/5c0a8ca6/attachment.htm>
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