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#642438 - 01/30/09 11:31 PM Re: Piano Changing Pitch 6 Cents in 10 Minutes!?
straightclaw Offline
Full Member

Registered: 12/02/08
Posts: 25
Loc: Indiana
Interesting techniques on pitch raising that I have never heard. I will have to experiment with some of these methods.

Regarding original post:
I just wanted to thank everyone for helping me with the Whitney Spinet pitch drop episode. I don't know when I'll see this piano again, but I will let you know what I find out. One thing I did notice is that after the forced air heat stopped blowing, the pitch of the strings came up from 6 cents flat to about 3 cents flat, but I didn't stick around to see what happened after that. I plan on returning on a warmer day.
_________________________
Learning to Tune.

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#642439 - 02/01/09 12:30 AM Re: Piano Changing Pitch 6 Cents in 10 Minutes!?
vince mrykalo Offline
Full Member

Registered: 03/23/04
Posts: 52
Loc: Utah
Referring back to the original post, even tho it's a Whitney spinet, it shouldn't have dropped like that. I concur that it's probably structural. No one has yet mentioned pinblock separation from the back. Also a plate crack may be developing at the treble strut.
_________________________
Vince Mrykalo RPT MPT
Piano Technician University of Utah

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#642440 - 02/01/09 09:36 AM Re: Piano Changing Pitch 6 Cents in 10 Minutes!?
nhpianos Offline
Full Member

Registered: 01/15/07
Posts: 116
Loc: NH/US
 Quote:
Originally posted by RonTuner:
Going back to your first post...

Forced air heat? Sun moving across the board? A big change of temp, or sunshine could certainly cause some issues - especially if you noticed everything from A0 up to C5 or so moving.

Ron Koval [/b]
I have seen even high quality pianos (Steinway B's & D's, Yamaha C7's) move several cents in as little as a minute or two when there is airflow around the piano such as forced hot air or AC. In one case the piano was a good 12' from the FHA floor duct and had a full DC with bottom cover. This was in a recording studio where the HVAC was just maintaining a normal temperature, not changing it. It's easy enough to check for this effect - just monitor A4 using your EDT while the HVAC is cycling on and off.

- Mark
_________________________
Mark Dierauf, RPT
NH Pianos
Piano technician & rebuilder since 1978
www.nhpianos.com

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#642441 - 02/01/09 04:37 PM Re: Piano Changing Pitch 6 Cents in 10 Minutes!?
straightclaw Offline
Full Member

Registered: 12/02/08
Posts: 25
Loc: Indiana
 Quote:
Originally posted by nhpianos:
 Quote:
Originally posted by RonTuner:
Going back to your first post...

Forced air heat? Sun moving across the board? A big change of temp, or sunshine could certainly cause some issues - especially if you noticed everything from A0 up to C5 or so moving.

Ron Koval [/b]
I have seen even high quality pianos (Steinway B's & D's, Yamaha C7's) move several cents in as little as a minute or two when there is airflow around the piano such as forced hot air or AC. In one case the piano was a good 12' from the FHA floor duct and had a full DC with bottom cover. This was in a recording studio where the HVAC was just maintaining a normal temperature, not changing it. It's easy enough to check for this effect - just monitor A4 using your EDT while the HVAC is cycling on and off.

- Mark [/b]
Good Idea Mark. This is what I was considering... monitor the A440 and other notes as the temperature cycles in the room and while I'm there inspect for structural issues.
_________________________
Learning to Tune.

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