Accuphase E 530 Brochure

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Accuphase E 530 Brochure

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The ultimate integrated amplifier operating in pure class A. Triple parallel output stage with power MOS-FET devices and strong power supply with toroidal transformer provide linear power progression: 120 W/ch (2 ohms), 60 W/ch (4 ohms), 30 W/ch (8 ohms). Current feedback topology in preamplifier and power amplifier sections assures superb sound. The E-530 is the ultimate integrated amplifier. It represents the sophisticated knowledge gained by Accuphase over many years of designing superb components. Latest circuit topology is matched by top-quality parts. The Accuphase dedication to sound quality is in evidence everywhere. In the output stage, power MOS-FETs driven in pure class A provide a musical experience second to none. The sound is detailed, expressive, and exemplary. The E-530 is destined to become a new reference for an advanced generation of integrated amplifiers. To assure low impedance and constant voltage speaker drive, the power amp section of the E-530 employs power MOS-FET devices arranged in a triple parallel configuration and operating in pure class A. The power supply features a large toroidal transformer and massive, high-quality filtering capacitors, supporting an output rating of 120 watts into 2 ohms, 60 watts into 4 ohms, or 30 watts into 8 ohms. This linear progression of power versus load impedance demonstrates the impressive capabilities of the E-530. Both the preamplifier section and power amplifier section use the highly renowned current feedback topology developed by Accuphase. The two sections can each be used in stand- alone mode. The E-530 is on a par with top- notch separate type amplifiers, both in terms of performance and sound quality. To prevent any possibility of interference, the preamplifier is driven by its own dedicated power supply. Features such as tone controls and loudness compensation allow tailoring of the sound. Playback/record connections for two recorders as well as terminals for two sets of loudspeakers make the E-530 the ideal centerpiece of a quality audio system. An optional digital input board allows direct handling of the digital signal from a CD player or other digital component, for highest-gradereproduction. Playback of analog records is also possible with an optional analog disc input board. Triple parallel push-pull output stage with power MOS-FETs operating in pure class A. Linear power rating of 120 watts/2 ohms, 60 watts/4 ohms, or 30 watts/8 ohms. The output stage (Figure 1) uses power MOS- FETs which have negative thermal characteristics. These are connected in a triple parallel configuration and driven in pure class A, ensuring linear power output down to extremely low load impedances. The parallel connection keeps output impedance low and minimizes inherent noise, and it also serves to distribute heat generated by the devices. This design makes efficient use of the superb linearity of MOS-FET devices in the low power range, contri- buting to performance and sound quality. Figure 2 shows the output power/ current characteristics for various load impedances. Output voltage remains largely constant even when load impedance changes, which means that the current increases linearly. The amplifier has ample reserves to handle musical signals with transient pulses, which is demonstrated by the clipping power rating from actual measurements: 180 watts into 1 ohm (music signals only), 153 watts into 2 ohms, 103 watts into 4 ohms, or 62 watts into 8 ohms. Current feedback topology in power amplifier and preamplifier sections guarantees top-level performance In the E-530, the signal current rather than the voltage is used for feedback. Figure 3 shows the operating principle of this circuit. 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. 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. Discrete-type line amplifier for superior sonic purity The line amplifier (Figure 5), which handles high-level signals from a CD player, tuner, or similar component, is entirely built from discrete par ts. The circuit uses current feedback in a topology that results in a pure complementary push-pull configuration. The Output current (A) Output voltage (V) * 1-ome operation possible with music signals only Fig. 2 Output power vs. load impedance(output voltage/output current: actual measurements) Input NFB Network Regulator Bias stabilizing circuit Regulator Output Fig. 1 Power amplifier circuit diagram (one channel) Fig. 4 Frequency response with current feedback (Response remains uniform even when gain changes) Input Output Fig. 5 Line amplifier circuit diagram Power MOS-FETs Input BufferCurrent adder I-V converter Trans-impedance amplifier Amplifier Output Current NFB network Fig. 3 Current feedback amplifier principle

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parallel arrangement of input devices helps to minimize noise. Highly reliable logic-controlled relays Program source switching is performed by logic-controlled relays which are arranged so as to permit the shortest possible signal paths. The hermetically sealed relays are high-quality types developed specifically for demanding communication applications. The contacts are twin crossbar types plated with gold forminimum contact resistance and outstanding long-term reliability. Tone controls use summing active filters for pure sound The tone control circuitry in the E-530 was specially designed with summing active filters. Figure 6 illustrates the operation principle of this circuit. The flat signal is passed straight through, and only when an adjustment is required, the characteristics created at F1 and F2 are added to the signal, thereby producing the desired change. This design provides efficient control without degrading signal purity.Large toroidal power transformer and high filtering capacity The power supply section features a massive toroidal power transformer with a rating of 450 VA. The high-efficiency transformer is housed in a non-resonant aluminum enclosure. Two large electrolytic capacitors, each rated for 40,000 µF, assure ample reserves also for reproduction of the most demanding passages. Power amplifier assembly with triple parallel power MOS- FETs and current feedback circuitry mounted to large heat sink Supplied remote commander RC-29 Allows volume adjustment and source switching. Line amplifier assembly Input Output Fig. 6 Tone control circuit diagram (summing active filter type) Gold-plated input/output jacks connected directly to relays