Hammond Model A, Manual, Page: 178 / 298

If the electric clock checks exactly, the organ pitch will be A 440. A difference of
two seconds in an interval of 14 minutes and 40 seconds w11l change the pitch one
part in 440. For example, if the synchronous clock indicates 14 minutes and 48
seconds in an actual interval of 14 minutes and 40 seconds, the organ pitch will
be 444 for middle A.
INSTALLATION
In order to use the Model G regulator with an organ, a change in the wiring on the
power panel inside the. console is necessary. This change in power wiring is shown
in figure 2.
These changes are made as follows:
1. Move blue wire from 14 to 13. (Do not make any other changes in 13)
2. Cut out jumper between 8 and 9.
3. Cut out jumper between 12 and 13.
If serial number of Console is below No. 328 it will be necessary to interchange
wires 8 and 9 in order to make revamped panel connections check with diagram shown
above. If serial number is below No. 775 it may also be necessary to interchange
wires 12 and 13.
In addition to above changes, one of the power circuits shown in figures 3 and 4
should be used. Also, the console-to-cabinet cable must be spliced to separate the
power cord as shown in figure 5.
Figure 3 shows a typical installation or the Model G regulator for use on an
unregulated frequency A.C. line.
Figure 4 shows a typical installation where the unregulated A.C. is supplied by a
rotary converter.
In both or these figures, the switch #2 is provided to eliminate undesirable noise
which is introduced through the amplification system if the console is started after
the amplifiers have been turned on. Switches #1 and #2 should both be located near
the console.
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