The Leslie model 251 is essentially a model 147 with the addition of a second (stationary) reverb channel. As such, it makes an ideal match for organs like the A-100 which have a reverb channel.
NOTE: the 251 connector uses the "6C" pinout, which is distinct from either the 122-style or the 147-style single-channel pinouts. Make sure you know how that connector is wired before you plug in that six-pin!
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