[pianotech] justify pitch raise

[Norm Barrett]

I asked Dr Sanderson how far off a piano needed to be to need a pitch 
raise and he said 8 cents. Also when new I was taught that this was 
caused by the strings pressing down on the soundboard. This theory does 
not make sense for the pianos that have no downbearing. I believe that 
the plate flexing is the largest factor and the combination of these 2 
factors means that each piano is a little different and some are easier 
that others.
Norm Barrett

Ron Nossaman wrote:
> snip
>
> One other thing that does fit here is what constitutes a "serious" 
> pitch raise. I've been reading for years here that anything beyond 2 
> cents off requires a pitch raise. If anyone is actually successfully 
> enforcing that protocol, then they are spoiled beyond my wildest 
> dreams by either perfect climate control, or customers rich and 
> gullible enough to pay extra for pitch adjustments twice a year. I 
> doubt that in the 30+ years I've been doing this, I've tuned more than 
> a couple of pianos that were within 2 cents. In school systems, 
> particularly, rarely less than 20 cents off (at least in places) twice 
> a year.
>
> So like with everything else, there's no simple answer.
> Ron N
>
>