Setting Pitch

[Dave Nereson]

----- Original Message ----- 
From: "Farrell" <mfarrel2@tampabay.rr.com>
To: "Pianotech" <pianotech@ptg.org>
Sent: Saturday, July 17, 2004 9:48 AM
Subject: Re: Setting Pitch


> "...be sure to check it against a fork for accuracy."
>
> You mean to be sure the fork is accurate. Right?
>
> Terry Farrell
>
> ----- Original Message ----- 
> From: "Elwood Doss, Jr." <edoss@charter.net>
> To: "Jim Rogers" <jimlr@earthlink.net>;

    Not necessarily.  Metal tuning forks are very stable over the years,
even decades, as long as they're not dropped or otherwise mistreated.
Electronic devices, however, can drift -- capacitors and resistors don't
retain their precise values forever;  capacitors can start to leak or
transistors can start to "drift" in their characteristics, and extremes of
temperature can affect them.  That's why they require re-calibration
periodically.    --David Nereson, RPT