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In the case where an instrument has a rear cover, it may be necessary to carefully remove the cover and locate the metal plate on the lower or upper shelf inside the organ.The aforementioned locations were applicable for instruments manufactured from 1935 all the way into the mid to late 1960's.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.

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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 organ's registers.

Around 2 million Hammond organs have been manufactured, and it has been described as one of the most successful organs ever.

Transistor spinet organ with drawbars, in some extent, corresponded to a kind of successor of L-100 series tonewheel spinet organ, although its new drawbars arrangement is slightly exotic; its upper manual has normal nine drawbars; on the other hand, lower manual has only two 8' drawbars with sawtooth.

This anomalous design was only followed by a few models (8000 series, 8100 series, and 8200 Aurora series).

The name reflects the unique audio effects the speakers produced because of a rotating baffle inside the speaker.

The Leslie sound was prominent on many rhythm-and-blues and rock 'n' roll records.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.As the magnetism varies, that induces an alternating current (AC) in the coil, which becomes one of the frequencies used in harmonic synthesis. Vacuum tube musical instruments mean electronic musical instruments generating sound with vacuum tube-based electronic oscillators.Two models in Church-styled cabinet were made under military specifications, and named G (G for "Government contract", with chorus), and G-2 (with vibrato), to be installed in chapels and officer's messes of U. Hammond Organ Company commercialized it in the late-1930s as Novachord (1939–1942) and Solovox (1940–1948).Although there are five revisions of units, these are interchangeable on all RT series consoles.

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