Hammond Model A, Manual, Page: 75 / 298

This generator change accompanies a wiring revision in the manual and pedal
switches which makes the frequencies from 1 to 9 unnecessary. Generators
having but 82 frequencies are easily identified by a blank space on the terminal
strip at the left of the ground terminals. The first terminal at the left of this
space is terminal # 10.
91 Frequency Generator with Complex Tone Wheels:
Model BV serial No. 17075 – 29737
Model CV serial No. 17075 – 30287
Model R T serial No. 1001 – 1201
Model B-2 serial No. 35000 – 40303
Model C-2 serial No. 35001 – 40459
Model RT-2 serial No. 1300 – 2150
In these consoles, the original two-tooth wheels in the generator have been
replaced with twelve two-tooth complex tone wheels, which supply a fundamental
tone. that is enriched with the odd-number harmonics. Both manuals
and pedal switch are wired differently and are therefore not interchangeable
with earlier models.
91 Frequency Generator with Complex Tone Wheels and narrow cover:
Models B-2, C-2, RT-2 (Except those listed in prior paragraph) and all
B-3, C-3, RT-3, A-100, and D-100.
This generator has twelve complex tone wheels and is identical to the one
above except for the generator cover. Because the output terminals of this
cover are not in order of frequency (See figure 6) this type of generator is
not interchangeable with the one above.
Note: Consoles have been made equipped with 115 volt 25 or 50 or 60 cycle and
230 volt 50 or 60 cycle generators. If the owner is contemplating moving to a
location having a different frequency of current, the complete generator must
be changed. Where voltage changes only are encountered, step-up or step-down
transformers will be necessary.
Generator Anchoring
When a console is set up for operation the anchoring must be loosened so that
the generator will float freely on its spring suspension system. No damage
will result if this is not done, but the console will sound noisy, and the same
is true if the anchoring is loosened but the console is not level. If the console
is to be moved a long distance the anchoring should be tightened during such
moves.
Several different types of anchoring have been employed and instructions for
loosening and tightening the generator in any particular console are given on
the instruction card contained in the bench which accompanied that console.
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