Accuphase P 5000 Brochure

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Accuphase P 5000 Brochure

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Current feedback circuit topology prevents phase shifts in high frequency range The P-5000 employs the renowned current feed- back principle developed by Accuphase. At the sens- ing point of the feedback loop, the impedance is kept low and current detection is performed. An impedance-converting amplifier then turns the cur- rent into a voltage to be used as the feedbacksignal. Since the impedance at the current feed- back point (cur- rent adder in Figure 3) is very low, there is almost no phase shift. Phase com- pensation can be kept to a minimum, re- sulting in excel- lent transient response and superb sonic transpar- ency. 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-5000 features a massive toroidal power trans- former with a maximum rating of 1 kVA. The trans- former is housed in a non-resonant alu- minum case filled with a material that transmits heat and absorbs vibrations. This completely pre- vents any adverse influences on other circuit parts. A tor- oidal transformer uses heavy-gauge copper wiring on a doughnut-shaped core, resulting in low impedance and high efficiency while allowing compact dimensions. Two ul- tra-large aluminum electrolytic capaci- tors rated for 47,000 µF each serve to smooth out the pulsating direct current from the rectifier, providing more than ample filter- ing capacity. n nn n nPower amplifier assembly with 6 parallel push- pull transistor pairs per channel mounted directly to large aluminum diecast heat sinks, MCS circuitry, and current feedback amplifier Fig. 4 Frequency response with current feedback I-V converter Current NFB network Amplifier Output Trans-impedance amplifier Current adder – Input Buffer + Input Buffer Fig. 3 Current feedback amplifier principle diagram