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Pipe Organs and Related Topics <[log in to unmask]>
Date:
Sun, 14 Mar 1993 14:02:48 -0500
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Hi, Tony.  It is possible to build a mechanical action windchest whose
pallets are pulled down by wires attached to the normal tracker action
and also to an electric or electro-pneumatic actuator.  Many of the
larger European trackers do this for the inter-manual couplers.  When
the organist draws the couplers, the key-touch does not change because
the mechanical action is still connected to only that manual's values;
the coupled chests are fired via the electric action.  Of course, the
contacts have to be adjusted so that the electric action operates so
that the valves all open simultaneously.
 
Once you have already fitted the pull-downs with electric coupling,
it is simple enough to provide a second console.  (This assumes an
electric stop action, but that is even more common than the electric
couplers, mostly to allow the use of a modern combination action.)
 
One of the more popular slider motor is a unit that is basically a VW
windshield wiper motor fitted with some special control circuitry and
linkage.  (That would allow a builder to provide an "intermittant"
action for the stop!  Sorry, the "blizzard of '93", as they are calling
it, must be having an effect!)
 
Larry Chace ([log in to unmask])

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