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Rusty string and velvet
#2898840 10/10/19 06:36 AM
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champy Offline OP
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Hi. I am a pianist not a technician....
I own a Yamaha CX7 at home. I live in Thailand where the weather is pretty humid. I had one a dehumidifier in my piano room but recently it stopped working. And the string get rusty while I'm trying to get a replacement...

This piano is VERY expensive... And my heart broke when I saw the rust on it... I also attached photos.

It is very strange that it get rusty mainly in the middle register of the piano...I have no idea why.

Here are some photos
[img]http://forum.pianoworld.com//ubbthreads.php/galleries/2898839.html#Post2898839[/img]


Here are some of questions I have.
1. Is it normal that piano string get rusty? Those pianos in the concert hall where the humidity is perfectly regulated don't and will never have a rusty at all... Or it is pretty normal to have rusty string we just have to clean it?

2. The technician I knew, (the best one in Bangkok) said once it get rusty, it will get better once we clean it BUT it never be the same...is that true? So I meant that the my grand piano will NEVER be 100% the same once it get rusty?.... I know that piano needs a lot of care ...but I didn't realize that it is SOO fragile.

3.Except cleaning the rust out and replace a broken dehumidifier, what else should I do?

4. Any idea why the rust is only on the middle register?

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Re: Rusty string and velvet
champy #2898877 10/10/19 09:32 AM
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Wow. That’s sad to see. How long was the humidity uncontrolled in your piano room?


Pianist, teacher, apprentice technician, internet addict.
Piano Review Editor - Acoustic and Digital Piano Buyer
Re: Rusty string and velvet
terminaldegree #2898944 10/10/19 12:31 PM
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champy Offline OP
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Just a week or two... only T_T

Re: Rusty string and velvet
champy #2898958 10/10/19 12:53 PM
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In your climate the thing that contributes to the condensation on the metal parts is the fact that it gets so hot during the day but then gets relatively cool at night. So the metal parts cool down at night and stay cool for quite awhile during the day because they have so much mass. When the warm humid day air hits the cool metal parts, you get condensation which causes the rust. You can do a few things to try to moderate the temperature swing inside the piano, you can lower the lid when you're not playing and cover it with a blanket or cover. That's no substitute for a dehumidifier, but it will help minimize the condensation on the strings while you find a replacement dehumidifier.


Yamaha P90, Kawai GL-10
Re: Rusty string and velvet
champy #2899151 10/11/19 03:28 AM
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The excess of rust located on the felt looks to be mostly caused by an acidic reaction with the tint or with the glue, plus the condensation. When lasting, the strings are less and less tunable because of that rust on the bearing point.

I don't see any other solution than replace the string and these pieces. If you're inclined to this, your tech should consider using stainless strings like the Paulello that are nickelized.

And the better maintenance is getting a dehumidifier-humidifier working inside the piano, with the lid down everytime you don't play


Ulrich Guillerm
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Ti Piano
Re: Rusty string and velvet
champy #2899182 10/11/19 09:08 AM
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I would agree with ulrichg that if the instrument had been equipped with piano dehumidifiers (e.g. Dampp-Chaser), and a stat, closed AND complete cover installed, this problem would have been minimized. This of course would be in conjunction with the room dehumidifier.

At this point there is little that can be done to stop the progress with strings as is.

Pwg


Peter W. Grey, RPT
New Hampshire Seacoast
www.seacoastpianodoctor.com
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Re: Rusty string and velvet
champy #2899402 10/11/19 11:40 PM
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Originally Posted by champy
. And the string get rusty while I'm trying to get a replacement...

Are besides a rust any frozen glue drops on strings there ? I seen it's in your photos here.


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