Customer Satisfaction

[Jurgen Goering]

All right, I'll jump....  I am very far from being an expert on 
scaling, but I have this to offer:   I agree it could well be a scaling 
issue.  With details on speaking lengths and string diameters, this 
could be determined.   I would suspect the % of breaking strength is 
very low in that area, coupled with high inharmonicity.

If so,  there may indeed be something one could do to improve the 
situation.   Changing to Pure Sound wire has shown to be successful in 
improving those types of scaling problems.  Pure Sound wire has a 
tensile strength of about 10% lower than common piano wire.  
Restringing the lowest plain wire unisons with this wire will 
significantly raise the % of breaking strength and lower inharmonicity. 
  The result is a tonal improvement.

If the client is not satisfied with the "masking" of the problem 
through voicing, restringing that area is worth a try.  Not much to 
lose, a lot to gain, and 100% reversible.....

Jurgen Goering
Piano Forte Supply
(250) 754-2440
info at pianofortesupply.com
http://www.pianofortesupply.com


On Jul 4, 2008, at 13:05, pianotech-request at ptg.org wrote:
> Anyone else care to jump in here?
>
> "Porritt, David" <dporritt at mail.smu.edu> wrote:Matthew:
>>  
>> If D-30 is the last plain string it must be a Baldwin SF-10 or it 
>> could be a model R (I don’t have those scales here in front of me).  
>> In my humble opinion it’s a scale issue.  The wire changes on the 
>> long bridge without any string length changes can and frequently do 
>> have big tonal changes there.  The string tension is radically 
>> different between those notes.  Some skilled voicing can sometimes 
>> partially mask the disparity but nothing will make it go away without 
>> rescaling. 
>>  
>> dave
>> David M. Porritt, RPT
>> dporritt at smu.edu
>>  
>> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On 
>> Behalf Of Matthew Todd
>> Sent: Friday, July 04, 2008 5:51 AM
>> To: Pianotech List
>> Subject: Re: Customer Satisfaction
>>  
>> Snip....
>> The note in question is D-30.  The piano is a Baldwin grand, and the 
>> D is the note just before the copper wound strings.  I did two things 
>> to the note.
>> I spent some time voicing, and then I made sure the knuckle and jack 
>> relationship was where it is supposed to be.  It was off some.
>>
>> If you were to play a D Major scale, by the time you hit D-30, it 
>> just doesn't quite match the previous notes.  It doesn't quite have 
>> the "life" the others have.  It is not bad.  In fact, if she didn't 
>> point it out to me (I wish she hadn't!) I wouldn't have noticed it 
>> when I tuned it a month ago.  There is just a little "thud" when you 
>> play it.  Or like the note is sounding with just a little less force 
>> and volume than the rest.  She demonstrated the way it sounds to her 
>> by playing a Sonata she had been practicing.  In the piece she is 
>> repeating the D, and that is how she probably discovered it.
>>
>> I know this will be difficult to diagnose over the internet, and it 
>> is definitely not something severe that calls for another tech, but 
>> it is a good learning experience for me, and I did tell her I wasn't 
>> going to give up, or call her "picky" or "crazy".
>>
>> Thanks!
>> Matthew




-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: text/enriched
Size: 5339 bytes
Desc: not available
Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20080704/9e3e5db1/attachment.bin