Yamaha Tuning Instability

[Alan R. Barnard]

Can you use an ETD to measure and demonstrate any "rocking" of the pinblock?
(Could sell a proper bedding job this way). But if there is movement, the
problem would show up while tuning, wouldn't it? Seems like long term
stability problems would be from something else.

No experience, just seems like ...

Alan Barnard


----- Original Message -----
From: "Farrell" <mfarrel2@tampabay.rr.com>
To: <pianotech@ptg.org>
Sent: Sunday, September 22, 2002 5:26 PM
Subject: Yamaha Tuning Instability


> My son's piano teacher has a 1983 Yamaha G5 (6' 7") grey market piano.
Other than tuning instability, the piano is in VERY good condition. She also
has a 1930ish Aeolian 4'some" microgrand in the same room. I have tuned both
pianos several times at six month intervals. The Yamaha consistently goes
out of tune significantly more quickly than the microgrand. No RH monitoring
and no DC (on either piano). The Yamaha does have business card gaps between
the pinblock and the flange.
>
> I will be servicing both these pianos two weeks from now. I plan to check
the rim screws and pinblock/flange fit on the Yamaha. I will shim any
pinblock/flange gaps I can find. She is going to start monitoring RH in the
room. But keep in mind, the Yamaha goes much more quickly out of tune than
the microgrand. Any other suggestions for things to look for? This is a
significant problem for this piano owner. I need to solve it. Any input will
be greatly appreciated.
>
> Thanks.
>
> Terry Farrell
>
>
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