Accuphase

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  • Publicado : 11 de março de 2013
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m Preamplifier and power amplifier with MCS topology m Parallel push-pull output stage delivers high quality 100 watts × 2 into 8 ohms m Current feedback principle combines superb sound with total operation stability m Logic-control relays permit straight and short signal paths m Tone control circuits m Strong power supply with large transformer m Option board slots provide capability for digitalsignal input and analog record playback

Sophisticated MCS topology assures outstanding S/N ratio Enjoy crystal clear sound emerging from a background of utter silence. Current feedback amplification, wide-band power transistors in parallel push-pull configuration, and potent power supply deliver plenty of quality power: 140 watts per channel into 4 ohms or 100 watts into 8 ohms. Option boardsallows digital signal input or analog record playback with impeccable quality.
The E-300 series has always played a central role in the Accuphase integrated amplifier lineup. Drawing from a wealth of know-how and experience, the E-308 incorporates the latest advances in circuit technology and materials research. It has been designed to deliver onehundred percent of musical enjoyment. Speciallynoteworthy is the MCS (Multiple Circuit Summing) topology implemented in the preamplifier and power amplifier sections. It drastically improves S/N ratio, allowing utterly natural sound to emerge from a background of deep silence. An integrated amplifier offers various advantages such as convenient operation and modest space requirements. However, because its overall gain is very high, even theslightest interference or crosstalk at the input can have a considerable effect on the sonic result. To preclude this possibility, the E-308 is designed to achieve total electrical and structural separation of the preamplifier and power amplifier sections. These two parts operate as if they were entirely separate components. An EXT PRE switch and dedicated inputs and outputs allow independent use of thepreamplifier and power amplifier. Both the preamplifier and power amplifier use the MCS principle developed by Accuphase, with multiple input circuits connected in parallel. Together with the current feedback topology, this results in a significant enhancement of all vital performance parameters. The power amplifier output stage adopts a parallel pushpull configuration of multi-emitter powertransistors designed for high-power audio applications. The large power transformer in the power supply and plenty of filtering capacity sustain ample highquality output power. The preamplifier section comprises features such as tone controls, loudness compensator, and facilities for recorder monitoring and copying. Each circuit component has been carefully selected after extensive tests. The endresult is an integrated amplifier that clearly stands out from the rest. Option boards can be used to implement digital inputs and high-quality analog record playback.
Parallel connection MCS topology in preamplifier and power amplifier stages Both the preamplifier (Figure 1) and power amplifier (Figure 2) employ the MCS (Multiple Circuit Summing) topology developed by Accuphase. This design resultsin significantly improved performance characteristics such as higher S/N ratio and lower distortion. In the E-308, the same signal is supplied to two separate amplification circuits, which also receive the feedback signal. The output of the circuits is combined, which is equivalent to parallel operation of the overall circuit. Mathematically, when using two parallel circuits, the improvement in S/Nratio is 3 dB. The circuit more conventionally used voltage is used for feedback. Because there is almost no phase shift, phase compensation can be kept to a minimum, resulting in excellent transient response and superb sonic transparency. Also, frequency response r e m a i n s uniform over a wide gain range. This is evident from Figure 4 Frequency (High) which shows Fig. 4 Frequency response...
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