pitch stability

[Farrell]

> It remains to be seen if I should increase the wattage on the unit. It has
> a belly of 38 watts and a tail of 25 watts.

I presume you are referring to dehumidifier rods?

My piano (Boston GP-178) at home has 190 Watts of rods underneath it. I find
that at times of high humidity in the home - say 75% RH - the unit still
runs 80% or so of the time.

A good idea for testing the dehumidifier function is to plug an old-style
electric analog clock into the humidistat during a period of something close
to the highest humidity commonly occurring in the piano's environment. Then
you can monitor quite accurately what percent of the time it is on.

Terry Farrell

P.S.  Boston GP-178 satin ebony, as fabulous as these pianos get, FOR SALE!

----- Original Message ----- 
From: "Don" <pianotuna@accesscomm.ca>
To: "Pianotech" <pianotech@ptg.org>
Sent: Thursday, June 10, 2004 10:49 AM
Subject: pitch stability


> Hi all,
>
> Seeing as the convention is about stability I have some data to add to the
> mix.
>
> The Piano:
>
> A venerable Yamaha C3 equipped with a full DamppChaser system and bottom
> cover.
>
> The condiditons:
>
> Tuned April 23, 2004 final pitch 0.54 cents sharp ambient humidity in room
20%
>
> By June 10, 2004 the humidity had risen to 42% and the pitch had gone up
to
> 2.0 cents (A4). The first note in the bass was 1.28 (A#2) and the first
> plain steel string (B2) was 4.18 cents sharp.
>
> Clearly the humidity control system is doing a very good job of keeping
the
> instrument stable, but I still chose to "float the pitch" at +2 cents to
> minimize the change in pitch.
>
> It remains to be seen if I should increase the wattage on the unit. It has
> a belly of 38 watts and a tail of 25 watts.
>
>
> Regards,
> Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
>
> mailto:pianotuna@accesscomm.ca
> http://us.geocities.com/drpt1948/
>
> 3004 Grant Rd.
> REGINA, SK
> S4S 5G7
> 306-352-3620 or 1-888-29t-uner
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