Clarke and all, Percentage of the breaking strain variation (adjacent to the bar) between treble sections also contributes to tuning instability. In 1992 we rebuilt a circa 1962 Steinway D with a rescaled treble. The the breaking strain percentage was evenly graduated from C88 to F21. We made no string length compromise as the bridge crossed under the frame bars (The bridge cap width was widened towards the bars - but not at its contact with the sound board - to accommodate the graduated string lengths). This piano is in service in the same concert hall as another Hamburg D (also rebuilt, but with a standard scale). Both instruments have similar down bearing settings. The tuning stability of the evened breaking strain scale is definitely superior (it is also easier to tune since the inharmonicity is more even - none of the usual problems laying an accurate temperement). Ron E. Overs Email: sec@overspianos.com.au Website: www.overspianos.com.au
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