Damp-Chaser in Texas

[Don]

Hi John,

Yes it rose 14 cents in 12 hours at A4 measured with an Accutuner II
reading at A4. I suspect the effect might have been even larger with a
bottom cover. Humidity was about 13% in the room both when I plugged in and
when I tuned.

The piano was in good condition structurally, and I was the only tuner
working on the instrument at that time.

I did the tuning after the 12 hour plug in time--I'd prefer to have waited
longer but the concert forced me into servicing it.

The unknowns are how long it was unplugged. It may have been as much as
five days or as few as two.

At 09:28 PM 4/27/2006 -0500, you wrote:
>Don,
>
>Are you saying that it rose 14 cents after you went by to check it and
>plugged it back in? Wow! Give me some more details if you can. Could there
>be some other factor(s) than just a DC system being unplugged for a "couple
>of days"? Is the piano structurally sound? Do you know what the humidity was
>then in March? RH in the average dwelling here is anywhere from 25-40% in
>March. 
>
><<I do not consider over one cent of drift per hour a slow change especially
>not when it may often be double (or more) than that at the first plain
>steel wire.>>
>
>Nor do I. But I've not observed this personally. On the D that I mentioned
>earlier, it is routinely unplugged out on the stage for performances, then
>plugged back in after it's over. There have not been any drastic changes
>like you noted. No one has commented about anything like this happening.
>I'll be tuning it tomorrow and Saturday, and will observe what happens. It
>will be unplugged Friday morning, and perhaps through Saturday. However, now
>the RH is around 42%, so I wouldn't expect any changes like you mention.
>
>John Formsma

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

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