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A tonewheel or tone wheel is a simple electromechanical apparatus used for generating electric musical notes in electromechanical organ instruments such as the Hammond organ and in telephony to generate audible signals such as ringing tone. It was developed by Thaddeus Cahill for the telharmonium c. 1896 and patented in 1897. [1]
The Hammond organ is an electric organ, invented by Laurens Hammond and John M. Hanert [1] and first manufactured in 1935. [2] 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.
The sound on a tonewheel Hammond organ is varied through the manipulation of drawbars. A drawbar is a metal slider that controls the volume of a particular sound component, in a similar way to a fader on an audio mixing console. As a drawbar is incrementally pulled out, it increases the volume of its sound.
Thanks to Hammond's prior manufacturing and engineering experience, the tonewheel generator was extremely well-engineered by the time the "Hammond Organ" finally went into production in 1935. Tonewheel organs are still in regular use in the twenty-first century, which is a testament to the quality of the design and execution of the product.
Until 1975, Hammond organs generated sound by creating an electric current from rotating a metal tonewheel near an electromagnetic pickup, and then strengthening the signal with an amplifier to drive a speaker cabinet. The organ is commonly used with the
A clonewheel organ is an electronic musical instrument that emulates (or "clones") the sound of the electromechanical tonewheel-based organs formerly manufactured by Hammond from the 1930s to the 1970s.
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Roland VK-7. The Roland VK-7 is an electronic keyboard introduced in 1997 which simulates the sound of an electromechanical Hammond organ.Like other electronic musical instruments that emulate (or "clone") the sound of the electromechanical tonewheel-based organs formerly manufactured by Hammond, the VK-7 is referred to as a clonewheel organ.
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