[pianotech] Test Blows

David Andersen david at davidandersenpianos.com
Fri Sep 4 11:11:39 MDT 2009


On Sep 4, 2009, at 7:06 AM, David Love wrote:

> Patton does teach that shank trick, not too much pressure, just  
> enough to offset the string by a couple mm’s.  He uses that only in  
> the capo section.  Interestingly, you find that when you test for  
> stability that way that too hard a “test blow” can actually  
> destabilize the string segments.  A couple of firm but not crashing  
> blows is all I find is necessary (though it can depend on the piano  
> and how easily it renders).  Tune mf, listen p, test f but not  
> fff.   The lower in the piano you go the less firm the test blow  
> needs to be as the increased mass and extrusion of the larger  
> diameter and longer strings tends to settle and stabilize things  
> more easily.   Use two fingers  together (or better two fingers and  
> thumb pinched together at the tips) on the test blows to lessen the  
> impact on a single finger and joint.
Or better than that, do what I do: use the fat, thick end of a fat,  
thick wool mute (the white and yellow ones) from Pianotek for the test  
blows.
Save your hands, fingers, joints, everything. Let the felt take the  
beating.
David Andersen
>
>
>
> In a message dated 9/3/2009 9:30:34 P.M. Central Daylight Time, formsma at gmail.com 
>  writes:
> You can try what someone from Steinway (John Patton perhaps?) taught.
> Use a hammer shank to see if the string is set. Apply lightish
> pressure on the string at about the same angle as the bridge pin.
> You'll probably have to experiment with how much pressure is needed.
>
> If stable, the pitch won't change.  However, this is cumbersome. I
> tried this for quite a number of tunings, and have since gone back to
> a firm test blow merely for the sake of speed.
>
> My firm blow is usually no harder than the weight of my hand and arm
> falling on the key. One or two of those blows will prove stability.  I
> need to get into the habit of letting my arm fall on the key to save
> my joints. Hard to break old habits.
>
> --
> JF
>
>

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