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May 17, 2021 - 4:36:43 PM
2537 posts since 12/31/2005

Is there an explanation for this? Banjo in standard tuning and intonation good all the way up. Put on Hartford strings and tuned to D. Sounded horrible fretted anywhere (including second fret). Checked with tuner and it was sharp about the same amount all the way up. Moved bridge back fairly significantly and canted slightly (bass string lower) and it sounds and registers correct in open and fretted.

The scale did not change. Why would the bridge need to be re-set? All is well that ends well, I guess, but I can't figure this out.

Does this happen with lesser degrees of string changes (e.g. from light to medium) and I just wasn't noticing?

May 17, 2021 - 4:45:28 PM
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beegee

USA

22371 posts since 7/6/2005

String tension and deflection. The Hartfords are slightly heavier than a med-light set of standard strings

May 17, 2021 - 5:19:27 PM

2537 posts since 12/31/2005

Interesting because (without compensation for the two angles of the string), I thought that the bridge was in theory to be the same distance from the 12th as the 12th is from the nut. I never knew that tension or deflection factored into that. I wonder if the general rule is true at some tension but below that tension it is different. Would the same principle applied if I put really light strings on and tuned higher than a G? Would I then have to move the bridge closer to the neck?

May 17, 2021 - 7:44:14 PM
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Alex Z

USA

4277 posts since 12/7/2006

quote:
Originally posted by Brian Murphy

Interesting because (without compensation for the two angles of the string), I thought that the bridge was in theory to be the same distance from the 12th as the 12th is from the nut. I never knew that tension or deflection factored into that. I wonder if the general rule is true at some tension but below that tension it is different. Would the same principle applied if I put really light strings on and tuned higher than a G? Would I then have to move the bridge closer to the neck?


First, the bridge is always a little farther from the 12th fret than the 12th fret is from the nut. This is because the string has stiffness. Different strings have different stiffnesses, depending on diameter and wound or unwound. 
 

So changing string gauges often means changing the position of the bridge.  The equal distance assertion is not uncommon on the BHO. 
 

There are other factors affecting bridge position too.  Yet, what changed was the strings, and that's a major factor. 
 

Hope this helps.  

Edited by - Alex Z on 05/17/2021 19:52:39

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