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Hammond Organ Schematics4/12/2021
Single manual, with automatic rhythm, automatic chording and no bass pedals. 26 56.Hanert 1 and first manufactured in 1935.Various models were produced, which originally used tonewheels to generate sound via additive synthesis, where component waveform ratios are mixed by sliding switches called drawbars and imitate the pipe organs registers.
Around 2 million Hammond organs have been manufactured, and it has been described as one of the most successful organs ever. The organ is commonly used with, and associated with, the Leslie Speaker. As the profile of the tonewheel pass by, the strength of the magnetism changeswhen the highest part is closest to the tip of the magnet, the magnetism is strongest. As the magnetism varies, that induces an alternating current (AC) in the coil, which becomes one of the frequencies used in harmonic synthesis. Two 61-note manuals, 25-note pedalboard, 2 x 9 drawbars per manual, 2 pedal drawbars, 9 presets per manual, a tremolo effect generator (tremulant). Made famous by Jimmy Smith who influenced numerous other players. Similar to the C-2, but with the added harmonic percussion circuit. Included 65 stop tablets, 12 couplers, 18 thumb pistons, 8 toe pistons. Tonewheel organ similar to DV but with 32 note AGO pedalboard. Hammond Organ Company commercialized it in the late-1930s as Novachord (19391942) and Solovox (19401948). Especially, new designs introduced on Novachord subtractive synthesis and frequency divider were immediately followed by many manufacturers of electronic organs and polyphonic synthesizers during the 1940s-1970s. Hammond Organ Schematics Series Chord OrganHowever, Hammond Organ Company did not adopt these on main products until the late-1960s, except for S series chord organ (19501966) and Solo Pedal Unit on RT series and D-100 (19491969). Although Novachord itself is not referred to as an electronic organ, its basic design became mainstream, being implemented in electronic organs and polyphonic synthesizers during 1940s-1970s. It consists of two units a 3-octave mini keyboard attaching under the piano keyboard, and a tone cabinet including electronic sound generator, amplifier and loudspeaker. The sound generator is based on a vacuum tube oscillator and octave divider circuits originally designed for Novachord. Although Solo Pedal Unit is highest-note priority and it can play only one note at a time, the players can play polyphonic bass lines by the help of traditional pedal sound. The sound generator is electrically similar to Solovox Model L. It consists of a vacuum tube oscillator and five frequency divider circuits, controlled by a volume and 8-stop tablets (Bourdon 32, Bombarde 32, 16, 8, 4, 2 1, mute, pedal solo on) placed on the right side of lower manual. Although there are five revisions of units, these are interchangeable on all RT series consoles. Key click was re-introduced. Supplied with matching Leslie HL-722. This series were all designed in the United States, built in Japan, and subsequently also assembled in England: Initially, first series were built by Yamaha (c.1969), then by Nihon Hammond during 19731975. Subsequently Hammond UK began to import these models in kit form, and assembled in proper wooden cases for domestic market. This anomalous design was only followed by a few models (8000 series, 8100 series, and 8200 Aurora series). Single manual, with automatic rhythm, automatic chording and no bass pedals.
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