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Topic Options
#606734 - 02/17/05 10:26 AM Pulsating, Wavering, Undulating Strings

I'm sure this is a well-worn question, but I'll ask it anyway. How in the world do you get rid of a bunch of false beats in the upper strings of a 100 year-old upright?

Trying to tune three strings together is next to impossible. Each string is a wavering, pulsating, undulating piece of steel wire. Itís crazy.

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#606735 - 02/17/05 11:18 AM Re: Pulsating, Wavering, Undulating Strings
Piano Guy Offline
Full Member

Registered: 07/01/03
Posts: 401
Loc: Southern Ontario,Canada
You need to look at the bridge in the upper treble. Check for cracking along the bridge pin line. If no cracks try a small brass rod and try and seat the offending strings tightly on the bridge. Check for adequate side bearing. You might have to repair the crack and re-set the bridge pins. Are you experianced??
Richard, the"Piano Guy"
Piano Moving Tuning & Repair
From London ON to Fort Erie ON

#606736 - 02/17/05 12:26 PM Re: Pulsating, Wavering, Undulating Strings
JIMBOB Offline
1000 Post Club Member

Registered: 11/18/02
Posts: 1323
Loc: South Carolina
How is the tuning pin torque ? You may be fighting a losing battle if the pin torque is under 48 inch lbs. What about the tuning pin height and condition of the strings and hammers ?
In the end you may need to replace the strings but some light hammer filing and shaping may help. You may want to try replacing a few strings to see what happens. Make sure you mic the strings to make sure you have the right gauge.
Certificate in Piano Technology
Associate Member PTG
Yamaha & Petrof/Nordiska Training
Dampp-Chaser System Installer
Certified Pianomation Installer

#606737 - 02/17/05 12:53 PM Re: Pulsating, Wavering, Undulating Strings
Brian Lawson, RPT Offline
500 Post Club Member

Registered: 07/04/01
Posts: 647
Loc: South Africa
Also, put some CA glue on the bridge pins, as it is a 100 year old piano. Maybe a few applications, then drop each string slightly to break any glue between the string, bridge & pin.
Brian Lawson, RPT
South Africa


#606738 - 02/17/05 02:06 PM Re: Pulsating, Wavering, Undulating Strings
Larry Buck Offline
2000 Post Club Member

Registered: 10/27/04
Posts: 2385
Loc: Lowell MA
Hi Rod,

Old strings or strings of poor quality can have this charactaristic.

After you have checked the bridge for damage, seated the strings into the bridge (excessive need for seating can point to bearing issues), you can check for sympathetic interference by muting off the strings between the bridge and hitch pins.

Beyond that, it is not uncommon for the strings to be just plain.....bad.

This can be checked by replacing a couple as to get three new unisions.

If it tunes cleanly.....there it is.

Once again, it is a common problem in old uprights and uprights of poorer quality for the the strings to have "false beats"
"If I have seen further than others, it is by standing upon the shoulders of giants."
Isaac Newton

E. J. Buck & Sons
Lowell MA 01852
978 458 8688

#606739 - 02/18/05 06:47 AM Re: Pulsating, Wavering, Undulating Strings
Keith Roberts Offline
1000 Post Club Member

Registered: 05/04/04
Posts: 1988
Loc: Murphys, Ca
The bridge pins, tap them down. A drop of CA glue.

Keith Roberts
Keith's Piano Service
Hathaway Pines,Ca

#606740 - 02/18/05 09:19 AM Re: Pulsating, Wavering, Undulating Strings
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 22173
Loc: Oakland
You need to learn how to tune imperfect strings. Life is not as neat as you would like.
Semipro Tech

#606741 - 02/19/05 09:28 AM Re: Pulsating, Wavering, Undulating Strings
Sam Casey Offline
1000 Post Club Member

Registered: 02/05/05
Posts: 1135
Loc: SW Missouri
Think first of the dollar-value ratio. You've got a $50 piano. In the customer's best interest how much should they invest in dinking around with bridges, pressure bars, flattend strings etc.? Hammers are probably worn to the wood, bearing uneven, bridge wedged against the plate, board cracked in a zillion places, block weak and a half step flat. Maybe brass flanges to boot and bass that sounds like a washtub. False trebles are the least of anybody's problems.

#606742 - 02/19/05 07:58 PM Re: Pulsating, Wavering, Undulating Strings
Nauvoo Offline
Full Member

Registered: 02/19/05
Posts: 20
Loc: Atlanta
Excellent counsel! Very good! Itís always smart to weigh the cost and effort versus the value of what you have in the first place. Balance! Sometimes the smart play is to simply walk away from it.

#606743 - 02/19/05 10:10 PM Re: Pulsating, Wavering, Undulating Strings
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 22173
Loc: Oakland
I think Rod is trying to learn how to service pianos. In that case, restringing his piano is a good way to learn a lot of techniques which he will need. It's better for him to learn on his piano than to inflict himself on someone else's with no experience at all. As a matter of fact, it would be worthwhile for him to do as much work as he can, as carefully as he can, on three or four pianos. Otherwise, sending him out to work on other people's pianos would be as bad as sending students to a teacher who had never learned to play anything more than Chopsticks.
Semipro Tech

#606744 - 02/20/05 09:10 AM Re: Pulsating, Wavering, Undulating Strings
Sam Casey Offline
1000 Post Club Member

Registered: 02/05/05
Posts: 1135
Loc: SW Missouri

I agree completely. I assumed the piano in question was a customers in which case the bigger picture should be considered.

What would be good too, along with working on the clunkers at home is to work with a dealer where there are lots of different pianos in various states. There you can get a feel of the business end as well as technical.


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