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Produced from 1963 to 1965, the G-100 (The "Grand 100") was Hammond's attempt to produce an electric organ as similar as possible to a classic pipe organ. For the classical repertoire, the flat pedalboard, drawbars, key presets, lack of couplers, etc. were simply too different for the performer than the radial arc pedal clavier, pipe stops, preset studs, couplers, etc. of a true pipe organ console (See the reasons why ClassicalOrganistsDislikeMostHammonds).

The G-100 was two manual instrument in a VERY large console with fifty stops divided into four tonal divisions:

    Swell Stops                  Antiphonal Stops
Geigen Diapason 16 ft.         Open Diapason 8 ft.
Bourdon 16 ft.                 Gedeckt 8 ft.
Diapason 8 ft.                 Salicional 8 ft.
Geigen Principal 8 ft.         Viola da Gamba 8 ft.
Concert Flute 8 ft.            Gemshorn Celeste 2 ranks
Aeoline 8 ft.                  Principal 4 ft.
Dulciana Celeste 2 ranks       Flauto d'Amore 4 ft.
Gamba 8 ft.                    English Horn 8 ft.
Octave 4 ft.                   Trumpet 8 ft.
Gedeckt 4 ft.                  Tremulant
Nazard 2-2/3 ft.
Flautino 2 ft.                   Pedal Stops
Tierce 1-3/5 ft.
Larigot 1-1/3 ft.
Mixture 3 ranks
Vox Humana 8 ft.
Oboe 8 ft.
Clarinet 8 ft.
Clarion 4 ft.
Swell to Swell 16 ft.
Swell Unison Off
Swell to Swell 8 ft.
Tremulant

Unlike the ConsoleOrgans preset keys (which can generate truly awful sounds if more than one preset key is pressed at a time), the organist on a Grand 100 could combine any of these stops.

Another key feature of pipe organs is the ability to save combinations of multiple stop settings that are recalled by the performer with thumb studs under the manuals and toe studs above the pedals. On the Grand 100 there were 18 thumb studs. These stop combinations could be recalled at any time and 17 different stop combinations could be changed at any time, even while playing. The eighteenth thumb stud was a preset sforzando combination for "full" organ. The stop tabs automatically moved on or off as combinations were recalled. The organ had 8 toe studs, six that duplicated combinations stored on thumb studs, one for the sforzando combination and the eighth was a Great-to-Pedal coupler.

To further improve the tone to make it even more like a pipe organ, the Grand 100 organ had two tonewheel generators to provide additional pitches up to the 26th harmonic. It also required two tone cabinet and amplifiers to split the Great and Swell into separate channels.

The Grand 100 had a 32-note, concave and radiating pedal clavier exactly like the conventional AGO pedal clavier in use on all pipe organs. A 32-foot stop was Included in the pedal and volume of the pedal was controlled by the Great expression pedal. The pedal tone was fed into both the Pedal and Great tone cabinets.

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