pitch instability in pianos humidity effects.

[Don]

Hi Ron,

Visual inspection of a piano in an art gallery with 3 zones. Zone one no
control, Zone two buffer zone--some control, zone three tightly control
humidity levels.

Piano had been fully serviced to try to improve stability (tapped,
tightened, coils set, etc.)

There was a correspondence to pitch change vs. humidity levels. The piano
was moved from zone to zone and was/is a small Korean product (Howard 171
cm piano). It was equipped with a damppchaser system (pre bottom cover),
and use of humidity control was sporadic.

After 18 tunings pitch change at A4 was +10 cents and worst note was +39
with room humidity of 27% (dc *not* in service, and piano in zone 2).

At 12:27 PM 01/11/2004 -0600, you wrote:
>
>>Hi Ron,
>>
>>Yes it is up and down
>
>Ok, let's try this the easy way first. Please define. What did you observe 
>indicating that the pins moved, and how did you observe it.
>
>Ron N


Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
Non calor sed umor est qui nobis incommodat

mailto:pianotuna@accesscomm.ca		http://us.geocities.com/drpt1948/

3004 Grant Rd.
REGINA, SK
S4S 5G7
306-352-3620 or 1-888-29t-uner