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The stock amplifier in the "classic" tube Leslies produces 40 Watts. It's a great amp and has a terrific sound but it has a tough time competing on stage with a guitar amplifier at full honk. It's not surprising that a common modification consists of some method of achieving higher power. This usually involves replacing the amplifier or else powering the Leslie from an external amplifier. The increase in power will probably require a change in drivers as well. (You probably did that anyway when you blew up the treble driver).
Also see LeslieDriverReplacement.
BradBaker provides details on a relatively simple 
modification which can be made to the 122 amplifier that allows it to use either 6550 or EL34 output tubes. The purpose for this modification is to improve the distortion characteristic of the Leslie amplifier.
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