post pitch-raise creep?

[John M. Formsma]

When I was using the Verituner, 12% in the bass was about right, and I did
the bass last.

25 - 40% seems quite high for the bass, but it depends on how flat things
are, and (I'd guess) it also depends on the lever technique. I'd always
quick "set" the pin, but for times' sake, not like in fine tuning. But if
you're just smooth pulling up to the overpull pitch and not really setting
the pin, I'd guess you'd need a higher overpull. The pins would maybe "set"
around the 10-12% place. ???

Things I do in the bass when doing an aural pitch raise are tune 4:2
octaves, or pure or slightly contracted P4s. That gets you in the ball park
fairly well for a fine tuning.

Ron N's post makes sense of why things shift around after a pitch
correction, and explains why it's good to schedule a follow-up fine tuning
after a pitch correction.

John Formsma

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Cy Shuster
Sent: Saturday, July 08, 2006 9:47 AM
To: Pianotech List
Subject: Re: post pitch-raise creep?

I've been chicken to try that big an overpull percent on the monochords, for

fear of breaking them.

In the TuneLab Pro documentation, Robert Scott recommends 12% for the bass 
bridge and 30% elsewhere, for small to moderate pitch raises.  For better 
results (tuning unisons as you go, bass to treble):

        bass bridge            12%
        tenor bridge to G5   29%
        G5 to G6                29% increasing to 37%
        G6 to C8                37% decreasing to 14%  (tension gets high up

there)

TuneLab's ability to measure each string and calculate a precise, individual

overpull percentage in realtime is one of its best features, I think.

--Cy--
shusterpiano.com

----- Original Message ----- 
From: "Farrell" <mfarrel2 at tampabay.rr.com>
To: "Pianotech List" <pianotech at ptg.org>
Sent: Saturday, July 08, 2006 3:38 AM
Subject: Re: post pitch-raise creep?


>I use a VT also Andrew, and I find that the upper end of your percent 
>ranges work for me in the tenor and treble. However, I find that the bicord

>bass needs closer to 25% and for whatever reason - I certainly don't 
>understand it - the monocord bass needs about 40%. I know, I've never heard

>of anyone using that much overpull in the low bass, but for whatever 
>reason, if I don't, it'll come out flat. Strange.
>
> Terry Farrell