It features two sets of line inputs with auto-select.

     The key components include three pairs of Burr-Brown IC: OPA627 for pre-amplification (being a new generation FET(Difet)op amp, is recongnized for its low noise and high speed.), BUF634 for increasing and sustaining higher output current(BUF634 is not only a high speed op amp current booster, it also improves compatibility with power amp and loudspeakers), OPA177 for DC servo(OPA177 makes sure the op amp output is free of DC power, avoiding any chances of harming the power amp and the loudspeakers. It also has another advantage. It’s not necessary to use extra output coupling capacitors and that improves the sonic performance a lot) On the power supply front, KingRex PRE-AMP is equipped with an 8VA toroidal transformer and a pair of National LM317T voltage regulators, delivering 13V/0.3A DC current to the circuit board. The Secret weapon is the unique design- plug-in PCB, Diamond Buffer circuit, which is a transistor-based all discrete-component buffering circuit that fine-tunes the incoming audio signal for frequency extension, tonal accuracy, holographic imaging and warm, tube-like atmosphere. Diamond buffer PCB mounted on top of the lower-deck main board through multi-pin connection. The advantage is this design is detachable.