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   RE: Yamaha GH1 scale
 From: Peter Grey
 To: Pianotech
 Posted: 12-05-2017 15:16
 Message: Nate,

I know Larry Buck has that kind of info.

In addition, riblets and mass loading of the bridge/soundboard can help that too. Del Fandrich is a good resource for that.

Pwg

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Peter Grey
Stratham NH
603-686-2395
pianodoctor57@gmail.com
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Original Message:
Sent: 12-05-2017 11:00
From: Nate Reyburn
Subject: Yamaha GH1 scale

Hi everybody,

I'm sitting at a Yamaha GH1 B from the late/mid 80s (448XXXX SN). It has the issue universal to these pianos where the notes on the bottom treble don't tonally match the rest of the instrument. They're producing an offensive "bong" sound. It's beyond what simple needles or anything dissolved in lacquer can fix. This is a scaling problem.

I seem to remember that there's a known scale adjustment that can be done here by changing out some of the bottom tenor bridge trichords for bichords (and agraffes/dampers as well). Does anyone have scaling or other info on this?

Thanks,
Nate Reyburn, RPT

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