User Guide

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PCB
True to AOpen’s heralded tradition of unique motherboard design, a black PCB is used for the
AX4B-533 Tube. Since the current and voltage of the tube design require more than just a conventional
motherboard PCB, the copper trace has been thickened and several quality improvements have been
made to ensure long term reliability and performance.
Power Capacitor
A magical ELNA electrolytic capacitor is coupled for voltage output for tonality that’s unparalleled.
By using very fine conductive particles of super high purity graphite and other “magical” material, this
Nichicon electrolytic capacitor has drastically lowered many of the distortion mechanism inherent in
electrolytic capacitors design.
Workmanship
Needless to say, AOpen’s workmanship is one of many of our traditions and it is applied to this
product again with “meticulously detailed” steps to ensure quality.
Power Supply for the tube
Max 668 --- Using Maxim 668 DC-DC converter.
Transformer for the Tube
A high quality EI ferrite core with 0.3mm AWG hyper copper wire that not only meets UL standards
but is also able to withstand 266 degree Fahrenheit (130 degree Celsius) operating temperatures. This
transformer supplies more than enough regulated voltage and current to power the tube circuitry.
Power resistor
The Vishay – Military and space-grade resistor is once again fitted seamlessly in this new design,
providing 1% tolerance. Made with high purity ceramic substrate, proprietary nickel-chrome alloy
element, and stainless steel end caps. No magnetic materials are used in any of the construction.