12 cents

[Don]

Hi Joe,

With respect, your experience in pitch correction is
not the same as mine at all. A piano that is moved 12
cents will not be stable.

The most recent example of this was a large old german
upgright I tuned in England. 

I did a 27 cent pitch correction at A4. The tenor was
somewhat flater and the last octave in the treble was
40 cents sharp. The piano was within 1 cent after the
pitch correction, unisons were lovely and the octaves
were very nice.

The piano is equipped with humidity control.

24 hours later the pitch at A4 was 2 cents sharp and
the tenor about 7 cents sharp. The mid treble was
fairly stable but the top octave was again sharp--by
about 30 cents. The bass on this instrument was
slightly flat. There were also many unisons that had drifted.

=====
Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
3004 Grant Rd, Regina, SK, S4S 5G7
Tuner for the Saskatchewan Centre of the Arts

http://us.geocities.com/drpt1948/

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