These are 3-Position Air Switches used in the Modern Aeolian player piano to control the volume of the music. In the Aeolian, the switch, in the spoolbox, is labeled 'Low-Med-Hi'. In the 'Hi' position, both of the nipples on the switch are Open to the atmosphere. In the 'Low' position, both of the nipples are closed. In the 'Med' position, one nipple is open and one nipple is closed. However, because of the way that the movable part of this switch is manufactured, it can be easily converted to a conventional 'Pass/No-Pass' switch by plugging the hole that allows atmosphere to enter the switch (as seen in the picture in the lower right corner). This is the type of switch that is commonly used for Sustain (or Loud) On-Off, or any feature where a signal needs to be turned 'off' or allowed to 'pass-through' to a device. The switch measures 1-3/8" x 3/4", and the shaft diameter is 1/4". Comes complete as pictured. Cost per switch is $65.00. To place an order, Click Here.

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