[pianotech] How long do unisons hold?

[David Nereson]

Within 24 hours, or probably even 6 hours, at least one unison 
will drift.  If somebody plays it, a unison will drift probably 
during their first song.
    --David Nereson, RPT


----- Original Message ----- 
From: <pianofritz50 at aol.com>
To: <pianotech at ptg.org>
Sent: Monday, March 08, 2010 8:17 PM
Subject: [pianotech] How long do unisons hold?



This subject was probably addressed somewhere in the past, but 
I'd be interested in any/all responses to this question:

How long do unisons hold (after a tuning)?

I realize it depends on the piano & the tuner... and the season, 
pin's torque, etc...  but I'm looking for a general rule of 
thumb.

Thanks...   Bill Fritz, St Louis