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It’s been modified, though Tom “Murph” Wanca from Nashville Pro Hammond installed an RTC Logic MCV2 card, which changes the 21H from a single-speed to a two-speed Leslie. Nevertheless, my 21H is a predecessor of the 122, with similar cabinet shape and identical top rotors. That seems odd today, but was a common approach to loudspeaker design before the development of the Alnico permanent magnet.
![line out hammond m3 line out hammond m3](https://i.ytimg.com/vi/u4lTVNchbm0/maxresdefault.jpg)
An electrodynamic speaker doesn’t have a permanent magnet like modern speakers do, it operates only when direct current (DC) is supplied to the electromagnet.
![line out hammond m3 line out hammond m3](https://www.woofersetc.com/media/catalog/product/cache/1/image/1000x/9df78eab33525d08d6e5fb8d27136e95/z/x/zxsum8_01.jpg)
The 21H was a single-speed Leslie with an electrodynamic 15″ speaker, which was either fast or off. And like the Trek II Percussion add-on for the organ, modifications are available for Leslies that make the original design of the cabinet less important-or at least less easy to figure out.įor example, my Leslie is a Model 21H with a 32H series amplifier. Though the 122 and 147 are the best-known Leslies, some of the others are excellent.
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If you look into the top of a Leslie cabinet, there are two horns on the upper rotor, but only one is pushing out the sound of the high-frequency driver-the other is a dummy providing a counterweight. The high and low frequencies are divided by an 800 Hz crossover. Whatever the specific model, most Leslies you’ll encounter share a general concept-that there is a rotating high-frequency horn (the upper rotor) as well as a low-frequency speaker mounted above a rotating drum that deflects the sound outward. Leslie cabinets are kind of the same way-dozens of models have come and gone. Even some of the spinet models like the ‘L’ and ‘M’ series organs, though smaller, can achieve some of the characteristic Hammond organ sound. And other models, like the B2 and C2, are essentially the same except for percussion, which can be added with an aftermarket box like that made by Trek II. Other organs, like Hammond’s A100 and the RT3, all have the characteristic sound of a B3. With Hammonds, for instance, the only difference between the B3 and C3 is the cabinet-all the electronics are the same. Most enthusiasts consider the ultimate Hammond/Leslie combination to be a B3 and a Leslie 122, but like so much related to this instrument, that ain’t necessarily so.
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