TONE GENERATOR
The main tone generator furnishes 91 different musical frequencies. It includes a tone wheel,
magnet, and coil for each frequency. Mounted on top of the generator are tuned filters to insure
purity of the tones.
PREAMPLIFIER
The Preamplifier is located within the console, suspended from the main generator shelf. Its
purpose is to amplify the signals before sending them to the amplifier. This unit also houses the
electrical portion of the swell or expression control .
POWER AMPLIFIER
A twelve watt amplifier is mounted on the lower shelf of the console. It receives the signal from the
Preamplifier and increases it in power to drive the two 12" speakers.
REVERBERATION SYSTEM
To the left of the amplifier are the reverberation amplifier and reverberation unit. A portion of the
output signal of the power amplifier passes through the reverberation unit to the reverberation
amplifier and this drives a third 12" speaker housed within the console. The degree of
reverberation heard can be regulated by rotating the knob marked "Reverberation Control" shown
in Figure 5.
In operation, an electrical signal from the amplifier is applied to the driver unit in the reverberation
device which then converts the electrical signal into mechanical energy. This energy is transmitted
through springs to a pickup unit where a part of it is converted back to electrical energy. The
remaining portion is reflected back to the driver and again back to the pickup at a time interval
determined by the spring lengths. This transaction continues until the signal energy is reduced to
one millionth of its original value. The transfer time from driver to pickup and the reflections within
the system itself produce the reverberation effect.
USE OF TONE CABINETS
Any Hammond Tone Cabinet may be attached to these organs by use of the proper cable plugged
into the outlet to the right of the AC input plug. Reverberation from the console is not transferable
to these Tone Cabinets. further information on connection of multiple tone cabinet installation, refer
to Section 4 of Service Manual covering larger models.
ECHO CONTROL
If a tone cabinet as mentioned above, is added, an echo control can also be attached. This permits
use of the self contained speaker or the added tone cabinet independently. One position of the
control permits both to play simultaneously. Complete instructions for its installation accompanies
the kit
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