Unstable C5 Grand

[Richard Brekne]

Of course its hard to say for sure without direct experience with a piano. But I
find often enough on newer C series grands a tendency towards a kind of
falseness that makes me want to "overwork" this exact area when tuning. Trying
too hard to make unisons come clean can cause your problem for sure. If you find
that this rings a bell so to speak, then try and see if you can identify and
alleviate some of the problem with the falseness first. I actually replaced a
whole section of strings around the capo bar, pulling bridge pins and replaceing
with the help of a drop of epoxy on a 2 year old C6 this spring. Cured the whole
problem.

Otherwise, overbright  voicing can exhasperate this kind of problem.



"Benny L. Tucker" wrote:

> Hi list;
>     I am soliciting the advice of you piano tuning wizards to help me solve
> a tuning problem.
>     Piano is a Yamaha C5 Grand, approximately 13 years old. In a large
> Baptist Church . There are 2 electric guitars and electric bass, full drum
> set and all amplifiers on stage and right behind the pianist. No humidity
> control system on piano. The problem is in stability of the unisons, but
> only in about a 1 or 2 octave area. It starts about 5-6 notes before the
> capo bar/plate strut up to about 5-8 notes above this strut.
>     Now I'm not talking about perfect unisons starting to whine a little,
> I'm
> talking about unisons slipping out very badly. I have tried every trick I
> know,
> and I just can't get it to stabilize for more than a week. The strings
> "seem" to be
> rendering over the bearing points good. The tuning pins are tight enough.
> The pitch stays very stable on this piano, even without a DC system
> installed. The piano is very bright and needs voicing, but the music
> director
> likes this bright sound.
>     If this sounds like a hammer technique or string setting problem, please
> respond with advice. I have tuned pianos all over the central Ga. area, and
> never had a
> call back, except for the recommended 6-month tuning. I feel my techniques
> are good,
> but any and all advice will be mostly appreciated. FWIW, I did lube the
> v-bar in this area
> with cpl, result=no help.
>     Thank you for allowing me to post to this list, and I look forward to
> many more conversations with you all.
>
>     Benny L. Tucker

--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway
mailto:rbrekne@broadpark.no