[pianotech] Yamaha Upright String Breaker

[Susan Kline]

I think this happened when Yamaha bought out the old Everett factory and 
decided to use what was there instead of bringing everything in from 
Japan. I had quite a bit of trouble with some of the P202's, in the bass 
only.

The bass strings approach from an extremely steep angle, especially the 
lower of the pairs. If they had managed to drill the tuning pin holes 
leaning, so that the approaching wire was closer to 90 degrees, they 
wouldn't have had this breakage (IMO.) The wire binds very severely 
right where the coil starts.

Susan

On 1/8/2011 12:00 PM, David Love wrote:
>
> One of those. Old 1970's with no obvious model number and I didn't 
> look for it---45" or 46" upright.  The hammers are actually pretty 
> well voiced and the piano doesn't sound too bad (thank you, I'm taking 
> a bow).  The angles are bad though which means any excess friction and 
> with the high BP% you exceed the break point in the tuning pin to 
> segment very quickly which is I'm sure what's happening.
>
> David Love
>
> www.davidlovepianos.com
>
> *From:*pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] 
> *On Behalf Of *Dale Erwin
> *Sent:* Saturday, January 08, 2011 11:50 AM
> *To:* pianotech at ptg.org
> *Subject:* Re: [pianotech] Yamaha Upright String Breaker
>
> Is this a P202 or a p-22. The one I find most common are above C-2 
> int  the bass.  The angles going to the pins are terrible.  I've seen 
> heavy thumpers decimate these scales especially if hammer care has 
> been non existent
>
> *Dale S. Erwin
> **www.Erwinspiano.com
> Custom restoration
> Ronsen Piano hammers
> Join the Weickert felt Revolution
> 209-577-8397
> 209-985-0990**
>
> *
>
> -----Original Message-----
> From: Ron Nossaman <rnossaman at cox.net>
> To: pianotech at ptg.org
> Sent: Sat, Jan 8, 2011 11:23 am
> Subject: Re: [pianotech] Yamaha Upright String Breaker
>
> On 1/8/2011 1:04 PM, David Love wrote:
> > I've got a Yamaha studio upright that continues to break strings at D3
> > (wrapped bichord). The speaking length is 890mm, the core wire 14 
> gauge and
> > the outside wrapped dimension is .058". My spread sheet shows that at 
> 69%
> > BP but my own formula might be low. Any string makers care to input 
> here?
> > It seems to me it's got to be too high.
>
> I get 69% too, and while I'm not a string maker, I call it too high 
> too. I know at least three makers who would complain immediately and 
> loudly if I specified something like this in a custom set.
> Ron N
>

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