tooling up for soundboard replacement

[Calin Tantareanu]

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Re: tooling up for soundboard replacementHello Ron O.!
  ----- Original Message -----=20
  From: Overs Pianos=20
  To: Pianotech=20
  Sent: Sunday, December 07, 2003 3:59 PM
  Subject: Re: tooling up for soundboard replacement




  I've just pulled down a 1962 Hamburg D for a rebuild. After pulling =
the plate we found that the board has collapsed in the second last =
treble section. There's plenty of crown out the back of the bridge, but =
the board is inside out between the bridge and the belly rail (would =
anyone like to see an image?). =20
Yes, I do!
  By the way folks, I am pleased to be able to tell you that our piano =
no. 4 will be playing by this coming Saturday. We are having an open day =
for local technicians to try it out against no. 3. Wal just got the last =
strings on today (Sunday) and I chipped it up to pitch this afternoon. =
Details of the new sound board design (the first is fitted into no. 4) =
can be released from Saturday December 13.
Congratulations!

Now some questions:

- What exactly is a semi-log-scale, as compared to a normal scale or to =
a pure logarythmic scale (as in old Italian harpsichords, where the =
speaking length doubles for each octave)? Would a pure logarythmic scale =
work for a modern piano? I guess that also means you can string it with =
a single wire size for the log part (until you get to shortened speaking =
lengths / bass strings).

- Regarding front duplexes: what is the advantage of making the metal =
termination behind the agraffe diagonal, giving different lengths for =
the duplex (which in your pianos, if I understood correctly, is =
specifically not tuned to any partial of the speaking length), rather =
than putting a single continuous metal bar behind the agraffes? Is there =
a need for the front duplex segments to have a certain length, or can =
they be made as short as possible (say1,5-2cm)?

Regards,

 Calin Tantareanu
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 http://calintantareanu.tripod.com
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