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Topic: Reply to Richard Burton a bout the detuning problem good |
Willie Sims
From:
PADUCAH, KY, USA
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Posted 7 Sep 2013 9:18 am |
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| I read your reply to my post a bout the six string detuning problem. If you put the extra pull Rod in the top hole of the changer leaver the nut will not be in contact with the changer leaver. Therefore it cannot hold the six string sharp. This Rod was on the guitar I got from Bruce bouton. He told me that when doing studio session work the recording engineers could hear the six string detune I am guessing that because Jack Strayhorn built this guitar far Bruce that that he came up with this easy fix for the detunning problem I would still like to know when this guitar was built maybe Jack Strayhorn could inform me as to the date he built this guitar |
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richard burton
From:
Britain
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Posted 7 Sep 2013 10:00 pm
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Willie,
My experience has been that a compensating rod (activated by the A pedal) to raise the 6th string a very small amount when the A pedal is pressed (to counteract the 6th string detuning) works well when only the A pedal is pressed.
However, when both A and B pedals are pressed, and then the B pedal is released (whilst still holding the A pedal down), the 6th string returns much too sharp.
This is because the A pedal cross-shaft flexes ever so slightly due to the small amount of added work it has to do when it raises the 6th string a tad.
If the B pedal is then pressed, thus raising the 6th string and reducing the amount of stress in the A pedal cross-shaft, the cross-shaft flex is reduced.
However, due (I think) to hysteresis in the cross-shaft (or maybe the nylon compensating tuner not sitting exactly in the same place on the changer finger), it will not return to its previously flexed position if the B pedal is released, and thus the 6th string is sharp (very noticeable on a plain .022 6th string, not observable on a wound 6th) |
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Kevin Hatton
From:
Buffalo, N.Y.
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Posted 8 Sep 2013 3:01 am
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| Excellent explanation Richard. |
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Jack Stoner
From:
Kansas City, MO
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Posted 8 Sep 2013 4:48 am
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| Compensator "rods" have been around for a long time. The Emmons you have with it on is not unique. |
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