Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info
MMD > Archives > July 2002 > 2002.07.10 > 09Prev  Next


Ampico Sustain Pedal Compensating Pneumatics
By Bruce Clark

Mr. Bullock questions the reason, and detail of connection for a 1" x
1" pneumatic mounted on the top side of the so-called spring pneumatic
attached to the main expression valve in some Ampico expression units.
["Enigmatic Pneumatics On Some Ampico A Actions", 020709 MMDigest]

The purpose of this 1" X 1" pneumatic is to slightly soften the
intensities when the sustaining pedal is on.

When the sustaining pedal is on, the force used to move the piano
action becomes less, because the pedal pneumatic has done part of the
work by lifting the dampers and thus reducing the amount of power
needed to play a note.

The 1" X 1" blocks are connected series, and tubed to a nipple
specially set in the top section of one of a pair of unit valves that
operate the sustaining pedal.  It is very important that there are
absolutely no leaks in this little system, or it will not work
properly.

Their adjustment is regulated by movement of the leather nuts on the
small rods connecting them to the spring pneumatic. The device attempts
to even out audible difference when the sustaining pedal is on or off.
The difference is very slight.

Bruce Clark


(Message sent Wed 10 Jul 2002, 11:07:28 GMT, from time zone GMT-0400.)

Key Words in Subject:  Ampico, Compensating, Pedal, Pneumatics, Sustain

Home    Archives    Calendar    Gallery    Store    Links    Info   


Enter text below to search the MMD Website with Google



CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2024 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Please Support Publication of the MMD with your Generous Donation

Pay via PayPal

No PayPal account required

                                     
Translate This Page