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MMD > Archives > July 2002 > 2002.07.10 > 16Prev  Next

Ampico Sustain Pedal Compensating Pneumatics
By Art Reblitz

Re "Enigmatic Pneumatics In Late Ampico A Actions"

The little pneumatics should be tubed to the sustaining pedal
valves.  When the sustain pneumatic lifts the dampers off the
strings, there is less weight (in a grand) or spring tension (in
a vertical) counteracting the force of the stack pneumatics for the
notes that have dampers.  Consequently, the stack plays the notes
which have dampers a little louder when the dampers are lifted than
when they are at rest.  The compensator pneumatics lower the suction
by a tiny amount, counteracting this effect.

This is described and illustrated on pp. 159-160 of my book "Player
Piano Servicing and Rebuilding."

Art Reblitz

(Message sent Thu 11 Jul 2002, 02:10:44 GMT, from time zone GMT-0600.)

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

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