[pianotech] Soundboard deflection - Pitch raise

[Ron Nossaman]

Ed Sutton wrote:
> This is an interesting thread.
>  
> I would point out that harpsichord and fortepiano pinblocks have a 
> tendency to belly downward in response to the tension on the tuning 
> pins. Old Bechstein pianos also have a characteristic break of the plate 
> strut at the block that indicates a similar flexing.
>  
> It should not be that difficult, with an appropriate gauge, to measure 
> for downward deflection of the block after a pitch raise.

No, it shouldn't, nor to measure soundboard movement, or 
overall linear changes between hitch and tuning pins with 
added tension. I see no reason to presume that pinblocks 
bellying downward would lower pitch either.

Ron N