That's the SD-1 / TrebleBooster curve, it transforms crunchy single channel amps into high gain beasts, +24dB of gain with both input Gain and output Volume sliders at +12dB. It comes with a 18v power supply which is required for that amount of boost.
It distorts way less than a SD-1 and/or GE-7 combination and sounds more like a 12ax7 pushing the front end.
I'm still experimenting, I might end up with a GE-7 into M108S combination.
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