string "noises"

[Allen Wright]

I'll try pitchlocks. I've never used them in this section of a piano,  
though - I presume they'd have to go at the back end of the speaking  
length, near the bridge?

I've already tried the voicing route, and it helped, but the noise is  
still noticeable.

Allen

On Jul 5, 2008, at 12:24 AM, Ed Sutton wrote:

> Allen-
>
> Sounds like a perfect description of a longitudinal mode.
>
> Pitch locks are an interesting suggestion. They're cheap and won't  
> hurt anything. And it would be a great discovery if they stop the  
> longitudinal wave.
>
> For longitudinal mode sounds, Jim Ellis' book does not recommend  
> changing the string gauge. He suggests (without a lot of  
> enthusiasm) softening the hammer enough to reduce the energy in the  
> higher partials. He also says you can try moving the strike point  
> in some circumstances. You could try sliding the action out a bit  
> to see if it makes a difference, and if you are very lucky, rehang  
> the hammers.
>
> Ed Sutton
> ----- Original Message -----
> From: piano57 at comcast.net
> To: Pianotech List
> Sent: Friday, July 04, 2008 6:11 PM
> Subject: Re: string "noises"
>
> Hi Allen,
>
> Do you have any Pitch-locks to try out?
>
> Barbara Richmond, RPT
>
>
>
>
> -------------- Original message --------------
> From: Allen Wright <akwright at btopenworld.com>
> Has anyone working on Hamburg Steinway B's (or similar instruments)  
> encountered shimmery high partial noises (quite noticeable) at the  
> level of 4 octaves up (perhaps at the major seventh pitch or  
> thereabouts), in the area around E3 in the plain wire tenors?  
> Perhaps half dozen notes stand out like this. I notice that the  
> sound greatly diminishes when I detune the notes by a semitone or  
> so...is this the longitudinal mode behaviour I've read about in  
> previous threads?
>
> And if so, are there specific recommendations for changing wire  
> gauge there in order to eliminate or improve this problem? I'd love  
> to try something like that - this is a piano belonging to a  
> customer who's really bothered by the sound. Personally, if it were  
> my piano I think I'd ignore it and probably not be bothered by it  
> much in a musical context; but you all know how these things go -  
> that sort of suggestion often doesn't fly with the concerned customer.
>
> Any opinions/suggestions will be most welcome. I've been able to  
> otherwise even out the voicing nicely, with some lacquer in the  
> bass and judicious shaping and needling elsewhere, which leads me  
> to be optimistic that if I can minimize this "feature" the customer  
> may ultimately be quite happy with the piano again. The piano is in  
> the shop, which means I can go at it methodically and even  
> experimentally.
>
> Sincerely,
>
> Allen Wright, RPT
> London, UK
>
>
>
>
>
>
>

Allen Wright
London, UK

http://www.broadjam.com/akwright




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