Attached are before and after of photos of a belly I did on an upright. Some might say I pushed the envelope to far in shortening the speaking length of the bass strings(they're probably right, but it's a way to learn something), the back scale is now huge. I did this with out much experience but I was very pleased with the bass. I think some loss of power as a trade off for a stronger fundamental might be an apt description as you put it David. The piano had horizontal ribs that I changed to a more traditional layout, I also added two large cut offs. Fenton ----- Original Message ----- From: "David Love" <davidlovepianos at comcast.net> To: "'Pianotech List'" <pianotech at ptg.org> Sent: Monday, March 10, 2008 7:54 PM Subject: RE: Bass Bridge Position > JD > > The reason for the 6 note transition I just outlined in another post so I > won't rehash that. > > I'm not terribly enamored of the low bass on the O and I still find the > tenor/bass transition (as on virtually all Steinways) to be a problem. In > the low bass I prefer a clear fundamental unmuddied by unwanted strong > upper > partials. The O in its original form does have power though it's a bit > too > gnarly for me and lacking a clear fundamental. While I have been able to > achieve a better sound which scale changes such as reducing the core wire > diameters, the short backscale length and possibly the cantilever seem to > contribute to the lack of clarity and weak fundamental in the low bass. > The > filtering of the low fundamental that the extended cantilever contributes > has been discussed by those with better theoretical knowledge than I have > and at this point my conversion to a straight up bass bridge is based a > bit > on faith and my own experience with such changes. Power is really > secondary > for me in this case. If I can have balance and continuity through the > scale, I'm willing to sacrifice a bit of power. > > Simple changes as you mention can be made to the O to make it acceptable. > In this particular project I was looking for something a bit different. > > David Love > davidlovepianos at comcast.net > www.davidlovepianos.com > > -----Original Message----- > From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On > Behalf > Of John Delacour > Sent: Monday, March 10, 2008 1:21 PM > To: Pianotech List > Subject: RE: Bass Bridge Position > > At 20:01 -0700 9/3/08, David Love wrote: > >>My scale experiments suggest that this scale looks a bit better with >>12 or 13 monochords in the bass instead of 10. I'd be curious to >>know how many notes on your transition and what the speaking lengths >>at the beginning and end were. > > If I were doing what you're doing I would take the singles up to note > 13 or possibly, given the reduction in speaking lengths that your > modification entails, to note 14. I don't see any point in having > more than 4 notes in the transition. > > I'm curious to know why you think an improvement can be made to the > performance of the O by such a shortening of the bass bridge lengths. > Certainly the bass lengths are long for a 5'10" piano and this is > achieved partly by rather short tail lengths on the bottom notes, but > I've always thought the performance of the bottom notes on the Model > O was rather remarkable left just as they are, including the apron, > with extraordinary shaking power. You are going to replace this with > a straight-down bridge and presumably be using double-covered strings > throughout the singles. On this piano I would do neither. If I were > going to get rid of the apron I would substitute an angled bridge and > I might well still use single-covered singles. > > I consider the O, for all its faults, a pretty well-balanced piano, > with a bass that, with simple changes to the bass strings (as > discussed in another thread) has the character I find suitable for > this piano. > > JD > > > > -------------- next part -------------- A non-text attachment was scrubbed... Name: UprightO-e.jpg Type: image/jpeg Size: 90763 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20080310/60abbd8d/attachment-0002.jpg -------------- next part -------------- A non-text attachment was scrubbed... Name: upright1-e.jpg Type: image/jpeg Size: 87621 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20080310/60abbd8d/attachment-0003.jpg
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