The Rise of Higher-Voltage Supplies
A stompbox is almost synonymous with 9 volts, to the point where you could grab a basic pedal with no graphics or writing near the power jack and probably be fine plugging in a center-negative 9-volt supply. Similarly, you likely would know that the input is on the right-hand side, and the output is on the left-hand side. It’s become convention—something we know instinctively.
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