Accuphase E 213 Brochure

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Accuphase E 213 Brochure

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F1 A1 A2 VR1 F2 VR2 OUTPUT INPUT Fig. 5 Tone control circuit principle (Summing active filter type) Power amplifier assembly with parallel push-pull output devices mounted to large heat sink, MCS circuit, and current feedback amplifier circuitry n nn n nSupplied remote commander RC-23 Allows volume adjustment and input source switching Highly reliable logic-controlled relays for best sound quality Program source switching is performed by logic- controlled relays which are arranged so as to permit straight and short signal paths for enhanced sonic purity. The hermetically sealed relays are high- quality types developed specifically for demanding communication applications. The contacts are twin crossbar types plated with gold for minimum contact resistance and outstanding long-term reliability. Tone controls use summing active filters for pure sound The tone control circuitry in the E-213 features sum- ming active filters. Figure 5 illustrates the operation principle of this circuit. The flat signal is passed straight through, and only when an adjustment is required, the charac- teristics cre- ated at F 1 and F 2 are added to the signal, thereby pro- ducing the desired change. This design provides efficient control without degrading signal purity. Gold-plated input/output jacks connected directly to relays Large power transformer and high filtering capacity The E-213 features a large power trans- former with a rating of 400 VA. The trans- former is mounted in an enclosure filled with damping material that has excellent heat transfer charac- teristics. This design prevents unwanted interaction with the rest of the amplifier. Two massive electro- lytic capacitors, each rated for 22,000 µF, are used to filter the current. This ample performance margin of the power supply ensures dynamic sound down to very deep frequen- cies. EXT PRE switch and power amplifier inputs allow separate use of power amplifier section The preamplifier section and power amplifier section are designed as separate entities. A convenient EXT PRE switch and dedicated inputs make it easy to use the power amplifier of the E-213 on its own. Two sets of heavy-duty speaker terminals Two sets of oversize speaker terminals are provided which accept also heavy-gauge speaker cable.