Sound-board modification

[John Ross]

Ron,
Would it be possible to use a strong magnet and a piece of metal, that 
could be moved around, to add this weight, to a specific place?? Then a 
person, might be able to find the 'sweet' spot.
John M. Ross
Windsor, Nova Scotia, Canada
jrpiano@win.eastlink.ca
----- Original Message ----- 
From: "Ron Nossaman" <rnossaman@cox.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Wednesday, December 21, 2005 6:42 PM
Subject: Re: Sound-board modification


>> That little (5') baby grand with the now tamed board in it has 
>> another issue.  The tenor is nice and big, even boomy at the end of 
>> the long bridge.  Then you cross the break and there is a significant 
>> drop in volume.  The volume then increases till we get to the bottom 
>> of the bass bridge where it is powerful again.  The upper end of the 
>> bass bridge is quite close to the rim.
>>
>> This question is for the re-builders.  I'm thinking of an unobtrusive 
>> design modification to the sound-board under the plate. ;-) I own 
>> this one outright, so....    How risky is it to zip a cut in the 
>> sound-board along the rim around the upper end of the bass bridge? 
>> I'm guessing to start short, like three inches and grow it a little 
>> as testing may indicate.  Would it be preferable to tame the bottom 
>> end of the long bridge?  Would a sort of "rib" glued up with ends 
>> glued and screwed to the rim work like a cut-off to tame that end of 
>> the bridge and unify things be better than loosening the sound-board?
>>
>> With fingers itching and tools gleaming,
>> Andrew Anderson
>
> Just the addition of a hundred or so grams (experiment) of brass to 
> the end of the low tenor might just tone it down enough to blend the 
> break adequately without risking anything.
>
> Ron N
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