Unfortunately the Eventides came out after the MC403 specs were established. Otherwise, I would have made sure the spec supported the Eventides, because I love 'em all! Luckily, the MC403 is well "over designed" in that it CAN power the Eventides, despite the spec. This power supply went through extremely rigorous testing and safety agency approvals that took over 2 years. My guess is no other power supply on the market has gone through (and passed) such testing, which ultimately makes for a well-built, reliable product.