This amp is for Hammond Suzuki Leslie 122A made before 2005. This factory new 122-style tube amplifier is a direct replacement for your vintage 122 Leslie amplifier. This chassis will mount in place of your old amplifier and only requires one connector to be rewired for the speakers. A quick way to determine if your Leslie is of this type is to examine the Leslie motors present in your Leslie. Vintage Leslies use two different motors to control the slow and fast speeds while newer Leslies only require one. The 122 amplifier can also be used to convert a 147 or 145 Leslie to a 122 Leslie. This amp provides that classic 40-watt tube sound that Leslie is noted for. We recommend that a factory-trained technician install this part.