For countries using 100V, 110V, 115V and 120V AC mains, select the 115V switch position on the Voltage Selector switch. For countries using 220V, 230V, and 240V AC mains, select the 230V switch position on the Voltage Selector switch. There is no externally accessible AC mains (line) fuse. The internal fuse is integral to the SMPS power supply and is not user serviceable. This fuse will not fail except under very unlikely fault conditions to the SMPS, and if this occurs a qualified service techn

This model has been designed with our unique ULTRA LIGHT unified design process, yielding a 600 watt professional high powered tour-class bass guitar amplifier, weighing only 3.75 lbs! This 2nd generation SHUTTLE® amplifier now incorporates our unique 3-Dimensional Power Management circuitry along with other enhancements like increased tube gain and high efficiency thermal management. Our proprietary 3DPM™ technology insures greater and more solid sounding output while retaining the feel and pla

Switch- mode power supplies convert the AC line directly to high voltage DC, then the precision PWM (pulse width modulation) inverter creates a new AC power signal at a frequency more than 1000 times higher than the original wall frequency of 50/60Hz. This new high voltage, high frequency power signal is then fed into a custom high frequency transformer that steps the voltage down. A high frequency rectifier and high ESR filter capacitors finish the process off by converting the high frequency A