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   RE: Yamaha GH1 scale
 From: Jim Ialeggio
 To: Pianotech
 Posted: 12-05-2017 17:07
 Message: I've had success with rescaling the entire tenor of a GPS-1, from #26 to the capo, with Paullelo wire, using the existing bridge layout. The GPS-1 is even worse than the GH series, discontinued almost immediately, so I think you could have a chance with an appropriate rescale.

What are the Speaking lengths of those nasty notes, and what notes are they...B2, C2?

Paullelo Type 1 core, raising the BP%  and using Paullelo soft iron wraps. I would be happy to try and rescale this sucker, leaving the bridge layout alone. You would have to add a couple of hitches though...not a biggy.   ​

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Jim Ialeggio
grandpianosolutions.com
Shirley, MA
978 425-9026
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Original Message:
Sent: 12-05-2017 15:15
From: Peter Grey
Subject: Yamaha GH1 scale

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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