Ideal replacement for the high voltage power supply circuitry in low power valve amplifiers. Greater efficiency and much smaller sized components compared to conventional mains transformer circuits, and no hum. Converts 12 VDC Input to 115/200/220/280 VDC output (link selected). Maximum power is 150 Watts, but anything above about 100 Watts requires additional cooling. Ideal for use in Class-A amplifiers with constant DC current drain - other amplifier classes will benefit from additional high-voltage regulation. Enable input allows use of amplifier kill switch.