[CAUT] Back length tuning

[Andrew Anderson]

Ed,
If I understand you correctly, he pulled excess speaking length 
tension across the bridge as needed to tune the rear duplex to a 
perfect interval of one of the in-tune strings.  Interesting...  On 
new pianos I'm always pulling these up to reduce instability.  I 
hadn't thought of tuning them that way... :-\  I'll have to try it on 
my next concert prep.

Andrew Anderson
TAMIU, LCC etc.



At 10:53 AM 11/29/2005, you wrote:
>Richard-
>
>I watched a fellow who had been trained by Fazioli.
>
>To raise the pitch of the back section, he tuned the speaking 
>section sharp until the back section raised pitch, returned the 
>speaking length to pitch, then tuned the back section by pushing 
>lightly with a wire settling wheel to lower it, then retuned the 
>speaking section.  The complete tuning took about 3 hours.  He said 
>you would only need to do this every year or two.
>
>He was about to retire due to hearing loss, so my job was to listen 
>to the back sections and tell him if they were in tune!  He was 
>going for perfect aliquots of the speaking length; it's obvious 
>which one will work on each string.
>
>He also had a tool to move the little tuning bars, but didn't use it.
>
>It definately produced a clearer, brighter sound, most noticeable 
>when playing individual treble notes.  I am not convinced the owner 
>could hear the difference.
>
>Ed Sutton
>
>-----Original Message-----
>From: Ric Brekne <ricbrek@broadpark.no>
>Sent: Nov 29, 2005 2:44 AM
>To: caut@ptg.org, pianotech <pianotech@ptg.org>
>Subject: [CAUT] Back length tuning
>
>Hi folks
>
>I would really appreciate hearing a bit about varying methods of
><<tuning>> the back scale of instruments.  Anyone with knowledge of
>Duplex Dans methods, other  approaches, basic tuning methods that
>perhaps address the back scale in anyway would be very nice to hear from.
>
>My basic understanding at present leads me to believe that the front
>duplex can be tuned to the detriment or enhancement of both sustain and
>tonal qualities if tuned slightly out of tune with the speaking lengths
>and that this applies to a much lesser degree to backlengths.
>
>  Any discussion, info, etc would be greatly appreciated.
>
>Thanks
>RicB
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