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Set to 15 Watts for maximum volume and more headroom before the sound “breaks up” as a result of overdriving the tubes. Set to 4 Watts to achieve this distorted sound at lower volumes. 6. POWER: This dual-function component is both an ON/OFF power switch and a status indicator light. When illuminated, it shows that your amplifier is ready to be played. To turn your amplifier on, press switch upward. To turn amp off, press switch downward. Note: After the power switch is turned on, the tubes must