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KingRex' Pre-Amp is a hybrid design that improves on conventional voltage amplifiers with discrete components and high-performance op amps, mated to a smart auto-select line input facility. It features the same aluminum faceplate, volume knob and chassis measurement as its PSU and T20U siblings. Key components include three pairs of Burr-Brown IC: OPA627 for pre-amplification (a new generation FET (Difet) op amp recognised 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), and OPA177 for DC servo, ensuring 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 negates the need for extra output coupling capacitors. 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 atmospheric effects. The Diamond buffer PCB is mounted on top of the lower-deck main board through multi-pin (detachable) connection. Dimensions:
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