1977 Yamaha U1

[jolly roger]

Hi John,
             It attained acceptable stability, I think this piano is prone
to frame trapesium distortion. And it is the cause of the shift in pitch.
Regards Roger


At 12:59 PM 7/9/01 -0500, you wrote:
>>...What kind of improvements did you get with the piano?
>>John Formsma...
>
>John, List,
>
>Pretty much the same results, and for the same reasons, that Jolly Roger
>mentioned.  I wouldn't hesitate to do the same procedure on another U1 that
>exhibited extreme changes in pitch fluctuation.
>
>Keith McGavern
>Registered Piano Technician
>Oklahoma Chapter 731
>Piano Technicians Guild
>USA
>