Figure 7 is a detailed diagram of the arrangement in figure 2. The 3 conductor
cable carries signal to all cabinets. while each cabinet has its own AC power cord.
In this case the 6 pole input plug in each additional cabinet is used for power
input only. and the signal is fed, into the 5 pole coupling receptacle.
A switch may be connected in place of the relay contacts to convert this circuit
to the arrangement of Figure 3.
ECHO ORGAN WIRING
Some desirable musical effects may be secured by an echo tone cabinet installed
at a location some distance from the main cabinet or cabinets. As indicated in the
block diagram, Figure 8, an echo switch on the console controls only the tone
cabinet signal circuits, and all cabinets remain energized so that they will sound
instantly when desired. Figure 9 shows the cable connections required.
REVERBERATION EQUIPMENT
Some types of tone cabinets have reverberation units and reverberation preamplifiers
built into them. In this case, see the instruction card attached to the cabinet for
correct cable connections. While there are several different styles of wiring, it
will be found that every cabinet has a 6 pole input plug and a 5 pole output
receptacle for connecting additional amplifiers. Some reverberation preamplifiers
employ a special detachable coupling cable, wired as shown at the bottom of
Figure 10.
In reverberation-equipped tone cabinets type CR-2O, DR-2O, ER-2O, FR-40,
and G -40, reverberation is applied to all organ frequencies. In this case only
one reverberation unit is required for any installation, no matter how many tone
cabinets are used. The reverberation unit should be in the cabinet which is
connected directly to the console, in order that reverberated signal may be supplied
by it to all other cabinets.
In multi-channel tone cabinets type JR-2O, HR-40, KR-40, PR-2O, PR-40
and QR-40 a reverberated signal is not available to drive succeeding cabinets. For
this reason an installation using several such cabinets must have a reverberation
unit in each cabinet if it is desired that reverberation be present in all
cabinets.
It is not recommended that multi-channel cabinets be driven by a reverberated
signal from a preceding cabinet because irregularities in the bass response
of the reverberation system may be emphasized by the bass amplifier channel.
In case one of these cabinets is to be used with one or more reverberation cabinets
of other types, it should be connected directly to the console, with the other
cabinets following it in the usual way.
Further information on types of reverberation equipment will be found in
the section dealing with this item.
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