Noisy Dampers on Shift

[Thomas Cole]

Paul McCloud wrote:

> Hi, Thomas:
>     Hard to diagnose damper problems over the 'net.  But, I'll take a 
> stab... 


In this case, it's hard to diagnose damper problems in person! Even with 
the advice of a couple of Fazioli technicians. Thanks to all for your 
ideas. Any observations about damper anomalies, especially when the 
hammers are striking only two strings, are requested.

I hope to have more info after next visit.

Tom Cole

> I'd check to see if the dampers ride in the bushings without excess 
> friction.  Remove the action and lift the dampers with your finger.  
> Do they fall and make a thump on the strings?  If they fall slowly, 
> you might see if they lean too heavily to one side and cause excess 
> friction.  Or the bushings may be swollen.  Are the strings level?  
> Are the damper heads directly over the strings, and do the damper 
> felts meet the wires simultaneously when the key is released?  Are 
> these trichord dampers with flat pads in front or back?  If the 
> dampers have both trichord and flat felt, see if the flat part is 
> sitting on the strings, or held up with the wedges.  I assume agraffes 
> in this section, no?
>     If the action shifts too far, perhaps the key end felt is rubbing 
> adjacent damper underlevers.
>     Sometimes buzzing can come from hard, glue-soaked bushing 
> felt.  When the dampers contact the string, the wire buzzes on the 
> hard felt in the bushing.
>     More info?

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