CHORUS GENERATOR
(Used in Models BC, D, E, and G)
The purpose of the chorus generator is to add a series of slightly sharp and
slightly flat tones to the true tones produced by the main generator. The resulting
electrical wave contains a complex series of undulations which enhance the pleasing
effect of many tone qualities, notably string and full organ combinations. It should
be noted that no chorus effect is produced on frequencies below 56.
The frequencies covered by the chorus generator are numbers 56 to 91 inclusive on
the main generator. The difference in frequency between the main generator and
either flat or sharp tone is 0.8% for frequencies 56 to 67 and 0.4% for frequencies
68 to 91. It is necessary that a lesser percentage of frequency difference be
present in the higher register in order to avoid too rapid undulation.
The chorus generator assembly, like the main generator, has a drive shaft with
twenty-four brass gears. Each gear drives a single assembly consisting of two tone
wheels. The drive gears vary as to the number of teeth, and the tone wheels operate
at twenty-four different speeds. This generator has forty-eight tone wheels, each
with a separate magnet and pick-up coil. Of these tone wheels, twenty-four are
single and twenty-four are double (see figure 1). The double tone wheels consist of
two discs with different numbers of teeth mounted on one brass hub. The single
wheels are electrically connected in pairs, each pair being so connected as to have
the same effect as one double wheel.
Figure 2 is a complete wiring diagram for connections between main and chorus
generators, and figure 3 is a back view of the chorus generator indicating the
frequency number of each magnet.
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