It's a single transistor boost, not unlike an Electra. This pedal is somewhat infamous in the DIY community for exaggerated claims about what it sounds like - although no one in their right mind would question the quality of the point-to-point work in the enclosure that Rift did.
The Boost switch is normally a foot switch. Note that the gain control does nothing without the boost switch engaged.
RIFT AMPLIFICATION EL34 - VERO LAYOUT
SCHEMATIC & SPICE RESPONSE
It's not much to look at - a bit of boost and dirt at higher settings, low-end is filtered off by the input cap and some highs are taken out with the tone control.
Schematic redrawn from the Gray Bench trace - check out the youtube channel if you have not already - a lot of good tear-down videos.
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