> Mid span? That's pretty weird. What is the core break% of the ones that > break? > Thanks Ron, I don't know as I don't have the piano here or the specs of the string. I did look up the piano though in my files. About 6'5", Walnut, s'n 109XXX. I am once a year changing out a bass string or unison's worth them. The piano has a lot of issues besides the breaking strings, but a new set would be a good upgrade, budget is definitely an issue with the clients. I would think the only mod necessary for a bi-chord unison would be the damper felt on affected notes. Probably save a significant amount off the string order. Fenton ----- Original Message ----- From: "Ron Nossaman" <rnossaman at cox.net> To: "Pianotech List" <pianotech at ptg.org> Sent: Monday, July 21, 2008 1:43 PM Subject: Re: chickering quarter grand-re-scale trichords > > > >> On the subject of the bass tri-chords in some of the vitage >> Chickerings, sorry I do not know the exact models, I have one or two >> I take care of with problems in this area. Very small gauge >> tri-chord notes with strings breaking. The wires break sometimes mid >> span during playing. > > Mid span? That's pretty weird. What is the core break% of the ones that > break? > > >> As part of a bass re-string or a more major overhaul would the >> re-scaleing of these notes to bichord be for any reason unadviseable. > > Depends on whose advice you solicit. With customer approval, I'll > eliminate wrapped trichords every time and go to bichords. > > >> Also, recently someone pointed out that changing wire sizes (plain >> wire) did not change the breaking point % of a note. After a few >> sample problems in P-Scale I confirmed this. This was really a >> forehead slapper for me. If this is true, bridge re-scaling is the >> only option for changing BP %. > > On plain wires, yup. You can change tension, but to change break%, you > gotta change speaking length. > > Ron N > >
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