Tech Talk - Back-Check

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Tech Talk - Back-Check

April 30, 2021

Tech Talk - Back-Check

Now that we have addressed let off, drop, and repetition lever spring adjustment in our previous discussions, rounding out the four primary adjustments is the back-check.


The back check itself is a small wooden block covered with a small piece of felt, over which, a strip of leather is stretched. It is mounted to the back end of the key with a wire that provides easy adjustment.


Its purpose is to catch the hammer after striking the string, in a position of approximately 5/8 of an inch from the string. When the hammer is called upon to repeat in rapid succession, the hammer does not have to begin from its initial resting position, but instead can begin its abbreviated journey back to the string, in essence, taking a shortcut.


Therefore, grand pianos can repeat notes faster than uprights. For it to function properly, both the surface and condition of the leather and hammer tail must be correct.


Too smooth a tail and a repetition lever spring that is too tight, the hammer will get sent back to strike the string again. A “bobble”, a very undesirable and noticeable condition.


Working together, the hammer checking, correct repetition spring adjustment, along with a few other variables, work together to create a very responsive action. One that is a joy to play.


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