pianodisc models

[Dean May]

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The PDS32 was the precursor to the PDS128. In the mid 90's the 128 came
out, a huge upgrade. It was made even better with the introduction of
the PDS 128 Silent Drive in the late 90's. As I understand it, Yamaha's
patent rights (purchased from Marantz Pianocorder) expired by then and
PianoDisc reversed engineered the technology for the silent drive. It
uses an algorithm to pulse the solenoid activation current to control
its velocity. Pre-Silent Drive used a low frequency pulse that was very
noisy. The Silent Drive technology uses a high frequency pulse. 
 
The PDS 32 was very noisy, from the power supply to the solenoids. 
 
Dean
Dean May             cell 812.239.3359
PianoRebuilders.com   812.235.5272
Terre Haute IN  47802
 
-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of David Ilvedson
Sent: Monday, October 17, 2005 7:13 PM
To: pianotech@ptg.org; caut@ptg.org
Subject: pianodisc models
 
List,
 
What is the difference with a Pianodisc model PDS32 and PDS128?

David Ilvedson, RPT
Pacifica, California

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