Power supply for MXR M-238 Iso Brick-Ea pedals. The MXR M-238 Iso Brick-Ea is a pedal power supply with 2 9V 100mA outputs, 2 9V 300mA outputs, 2 9V 450mA outputs, 2 18V to 250mA outputs, 2 adjustable 6V or 15V 250mA outputs. Each output is completely isolated and free from ground loops.