1977 Yamaha U1

[jolly roger]

Hi John,
             If the piano gets moved around a bit and the floor is a
uneven,  the U1 is suseptable to pitch change.  A discussion took place on
the caut list some time ago.  So plate bolts could be important even, if
the piano is only being moved a foot or so.
The problem can be minimized by adding two cross beams across the back
post.  2  1" X 3" strips of oak made a big difference on the one that I
modified.  The added pieces were glued and screwed to the post.  This is a
class room piano that frequently gets moved from the wall to centre of the
room.  This piano has both a DC and a complete padded cover when not in use.
 I have no doubt you need a DC on this instrument, but it may be worth
asking if they move the piano,  even a small amount. It will rule out that
possibility.
Roger


At 07:35 AM 7/9/01 -0500, you wrote:
>Keith,
>
><<It has been mentioned numerous times in the past that tightening plates
>bolts/screws can aid in stability of tuning, so insuring such a thing is
>done could only be a plus in your situation.>>
>
>That is what I was thinking, but Ron N has got me thinking all about it. :-)
>
><<Should there still be dramatic changes in pitch after doing the above,
>mounting support boards (preferably hardwood 1" x 3") across the back of
>the piano perpendicular to the backposts (minimum of 3, two above the
>handles evenly spaced, one below the handles evenly spaced) is an option.>>
>
>What kind of improvements did you get with the piano?
>
>John Formsma
>Blue Mountain, MS
>
>mailto:jformsma@dixie-net.com
>