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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20110108/025d78c1/attachment.htm>
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