Accuphase P 3000 Brochure

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Accuphase P 3000 Brochure

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effective heat dissipation and reduces the impedance of the output stage. Current feedback circuit topology prevents phase shifts in high frequency range The P-3000 employs the renowned current feedback principle developed by Accuphase. At the sensing point of the feedback loop, the impedance is kept low and current detection is performed. An impedance-converting amplifier then turns the current into a voltage to be used as the feedback signal. Since the impedance at the current feedback point (current adder in Figure 3) is very low, there is almost no phase shift. Phase compensation can be kept to a minimum, resulting in excellent transient response and superb sonic transparency. Minimal amounts of NFB are used to maximum effect, providing natural energy response. Figure 4 shows frequency response for different gain settings of the current feedback amplifier. The graphs demonstrate that response remains uniform over a wide range. Robust power supply with "Super Ring" toroidal transformer and high filtering capacity The P-3000 features a massive toroidal power transformer with a maximum rating of 700 VA. The transformer is housed in a case filled with a material that transmits heat and absorbs vibrations. This Gain(Large) (High) Frequency completely prevents any adverse influences on other circuit parts. A toroidal transformer uses heavy-gauge copper wiring on a doughnut-shaped core, resulting in low impedance and high efficiency while allowing compact dimensions, which is especially useful for audio appli- cations. Two ultra-large aluminum electrolytic capacitors rated for 47,000 µF each serve to smooth out the pulsating direct current from the rectifier, providing more than ample filtering capacity. BufferCurrent adder I-V converter Trans-impedance amplifier Amplifier Output Current NFB network - Input Buffer + Input Fig. 3 Principle of current feedback amplifier nPower amplifier assembly with 3 parallel push-pull transistor pairs per channel mounted directly to large heat sink, MCS+ circuitry, and current feedback amplifier Fig. 4 Frequency response with current feedback(Response remains uniform also when gain changes)