Frequencies impressed on the busbars, when a pedal is played, are picked up by the
contacts of the pedal piston which is in use, and go from there to the preset panel
through pistons 1 or 2 or to the drawbars through piston 4. From the coupler (Piston
3) the upper seven harmonics connect to busbars in the great manual, while the lower
two connect to the lower pedal drawbar and permit it to be used with the coupler.
Connections from the pedals to the manual are indicated in Figure 12. A low voltage
line from the preamplifier heater transformer operates the 2.5 volt pedal preset
indicator lamps through the external contacts on the pedal switch. Several filter
chokes and resistors mounted on the pedal switch are wired in series with leads from
the lower pedal harmonics.
12
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