There was a similar thread that asked the same question. The RS1B owner actually wound up with an old Perreaux amp, vintage 1980s....It supposedly gave slamm that nothing else ever could. I forgot the model. The thread is this past month's. Look for it.
PS: the amp seem to come up used very rarely...for its age and also because it seems to be in very high demand.
PS: the amp seem to come up used very rarely...for its age and also because it seems to be in very high demand.