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Parallel push-pull output stage delivers quality power: 90 ...

M Parallel push-pull output stage delivers quality power : 90 watts per channel into 8 ohms m Current feedback circuit topology provides outstanding high-range phase characteristics m Logic-controlled relays for optimum signal routing m Tone control circuitry m Option boards allow digital signal input or high- quality analog disc reproduction Enjoy high-grade CD reproduction enabled by option board with high- precision MDS type D/A converter digital input. power amplifier uses current feedback principle for outstanding high-range phase characteristics and impeccable sound quality . Wide-band power transistors in Parallel push- pull configuration deliver 115 watts per channel into 4 ohms or 90 watts per channel into 8 ohms. The Accuphase E-200 series of integrated ure 3 shows amplifiers is one of our core product ranges, frequency renowned for technological excellence and response for impeccable quality . The model lineup so far different gain consisted of the E-210, E-210A, and E-211.

Parallel push-pull output stage delivers quality power: 90 watts per channel into 8 ohms Current feedback circuit topology provides outstanding high-range phase characteristics Logic-controlled relays

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Transcription of Parallel push-pull output stage delivers quality power: 90 ...

1 M Parallel push-pull output stage delivers quality power : 90 watts per channel into 8 ohms m Current feedback circuit topology provides outstanding high-range phase characteristics m Logic-controlled relays for optimum signal routing m Tone control circuitry m Option boards allow digital signal input or high- quality analog disc reproduction Enjoy high-grade CD reproduction enabled by option board with high- precision MDS type D/A converter digital input. power amplifier uses current feedback principle for outstanding high-range phase characteristics and impeccable sound quality . Wide-band power transistors in Parallel push- pull configuration deliver 115 watts per channel into 4 ohms or 90 watts per channel into 8 ohms. The Accuphase E-200 series of integrated ure 3 shows amplifiers is one of our core product ranges, frequency renowned for technological excellence and response for impeccable quality . The model lineup so far different gain consisted of the E-210, E-210A, and E-211.

2 Settings of With the E-212, we are now introducing a the current further refined version of the E-211, featuring High-current power transistors feedback latest circuit design topology and top-notch amplifier. The Fig. 3 Frequency response with current feedback materials. Sound quality has reached an even ity, and switching performance characteristics. graphs dem- (Response remains uniform even when gain changes). higher level than before, presenting a superbly By connecting these devices in a Parallel push- onstrate that matched blend of performance, features, and pull configuration (Fig. 1), the E-212 achieves response remains uniform over a wide range. musicality. low internal impedance. The transistors are The power amplifier section of the E-212 mounted to large heat sinks for efficient dissi- Highly reliable logic-controlled relays boasts excellent phase characteristics and pation of thermal energy. This lavish design smooth reproduction thanks to the highly re- results in high- quality power output capabili- To realize the shortest possible signal paths, nowned current feedback principle.

3 In the out- ties rated for 115 watts into 4 ohms, 105 watts all switching is performed by logic-controlled put stage , a Parallel push-pull arrangement of into 6 ohms, or 90 watts into 8 ohms per chan- relays arranged in an optimized layout. The high-current power transistors designed for nel. hermetically sealed relays are high- quality demanding audio applications is used, allow- types developed specifically for demanding ing the amplifier to drive even very low imped- Current feedback circuit topology in power communication applications. The contacts are ance loads with ease. The preamplifier sec- amplifier section assures outstanding twin crossbar types plated with gold for mini- tion has its own power supply to eliminate in- phase performance in high frequency range mum contact resistance and outstanding long- teraction with the power amp circuitry. Tone term reliability. controls, loudness compensator and other In the E-212, signal current rather than volt- features let the user tailor the sound if desired.

4 Age is used for feedback. Figure 2 shows the Up to two tape recorders can be connected for recording and playback, and terminals for Current adder two sets of speakers are provided, making the I-V Amplifier E-212 a flexible and attractive performer. In Input converter output Buffer Trans-impedance addition, various options make the E-212 even amplifier more versatile. A digital input board with MDS Current NFB Gold-plated input/ output network jacks connected directly to relays (Multiple Delta Sigma) D/A converter allows direct input of the digital signal for example Fig. 2 Current feedback amplifier principle diagram from a CD player for ultra-pure music repro- Tone controls use summing active filters duction. An option board for reproduction of operating principle of this circuit. At the sens- for highest sound quality analog records is also available. ing point of the feedback loop, the impedance is kept low and current detection is performed.

5 The tone control circuitry in the E-212 was Parallel push-pull power unit delivers An impedance-converting amplifier then con- specially designed with summing active filters. 115 watts/ch into 4 ohms or 90 watts/ch verts the current into a voltage to be used as Figure 4 illustrates the operation principle of into 8 ohms the feedback signal. Since the impedance at this circuit. The flat signal is passed straight the current feedback point (current adder in through, and only when an adjustment is re- The power transistors used in the output stage Figure 2) is very low, there is almost no phase quired, the are multi-emitter devices designed for audio shift. Phase compensation can be kept to a character- applications, with optimum frequency re- minimum, resulting in excellent transient re- istics are sponse, forward-current transfer ratio linear- sponse and superb sonic transparency. Fig- created at F1 and F2. and added to the sig- nal, thereby producing the desired change.

6 Tone control characteristics Input output Bias stabilizing circuit Fig. 4 Tone control circuit diagram Fig. 1 power amplifier circuit diagram (one channel) (summing active filter type). This design provides efficient control without Strong power supply with large power degrading signal purity. transformer and high filtering capacity Two pairs of speaker output terminals The power supply is the source of energy for an amplifier. The E-212 features a massive The oversize speaker terminals accept even 400 VA power transformer and two large elec- very heavy-gauge speaker cable. The A/B trolytic capacitors rated for 22,000 F each. switch-selectable outputs allow driving two This assures ample reserves also for repro- pairs of loudspeakers, while the A+B position duction of demanding bass passages. can be used for bi-wiring where the low and high frequency drivers of a speaker are con- nected to the amplifier with separate leads. High-capacity power transformer and filtering capacitors n power amplifier assem- bly with Parallel push- pull output stage and current feedback cir- cuitry mounted to large heat sink Analog peak power meters The large analog power meters use logarith- mic compression to cover a wide dynamic range.

7 The peak hold function lets the user easily monitor the output level of the rapidly fluctuating music signal. n Supplied remote commander RC-23. Allows volume adjustment and source switching. Option Boards Other Features and Functions Digital Input Board DAC-10. n Option board handles direct digital signal Three types of option boards are available for the E-212: the This board features an MDS (Multiple Delta Sigma). input for high-grade CD reproduction. Digital Input Board DAC-10, the Analog Disc Input Board D/A converter and has inputs for coaxial and AD-9, and the Line Input Board LINE-9. Insert the desired optical fiber connections. n Option board allows analog record repro- board in the rear-panel option board slot. duction. It can accept the digital output signal from com- ponents such as a CD player, MD recorder, DAT. n High- quality volume control. Supplied re- m The DAC-10 cannot be used in the models E-407, E-406V, recorder, etc.

8 (sampling frequency range 32 - 96. E-306V, E-211, C-265. mote commander for volume adjustment kHz, 24 bits). and source switching. m The Analog Disc Input Board AD-10 and the Line Input Board LINE-10 can also be used. n High carbon cast-iron insulator feet for high sound quality . Analog Disc Input Board AD-9. n Loudness compensator for enhanced bass This board contains a high-performance, high-gain at low listening levels. phono equalizer. Internal DIP switches control MM/MC operation, MC input impedance, and subsonic filter on/off. Gain: 36 dB. MM. Input impedance: 47 kilohms Gain: 62 dB. MC. Input impedance: 10/30/100 ohms (selectable). Line Input Board LINE-9. This option board provides an additional set of conventional unbalanced line inputs which can be used to connect a CD. Compensator response player, tuner, or other component with analog output . Option board shown in photo is DAC-10. n Front panel GUARANTEED SPECIFICATIONS. [Guaranteed specifications are measured according to EIA standard RS-490.]

9 ]. m Continuous Average output power 115 watts per channel into 4 ohms (both channels driven, 20 - 20,000 Hz) 105 watts per channel into 6 ohms 90 watts per channel into 8 ohms m Total Harmonic Distortion , with 4 to 16 ohms load (both channels driven, 20 - 20,000 Hz). m Intermodulation Distortion m Frequency Response HIGH LEVEL INPUT: 20 - 20,000 Hz +0, - dB. (at rated continuous average output ). m Damping Factor 100 (with 8-ohm load, 50 Hz). m Input Sensitivity, Input Impedance Sensitivity Input Input impedance For rated output For 1 W output (EIA). HIGH LEVEL INPUT 213 mV mV 20 k . n Rear panel BALANCED INPUT 213 mV mV 40 k . Option board m Gain HIGH LEVEL INPUT output : 42 dB. expansion slot (UNBALANCED/BALANCED). m Tone Controls Turnover frequency and adjustment range BASS: 300 Hz 10 dB (50 Hz). TREBLE: 3 kHz 10 dB (20 kHz). m Loudness Compensation +6 dB (200 Hz) (Volume control setting -30 dB). m Attenuator -20 dB. m Signal-to-Noise Ratio Input shorted, IHF-A weighting Input S/N ratio (EIA).

10 S/N ratio at rated input HIGH LEVEL INPUT 110 dB 81 dB. BALANCED INPUT 92 dB 81 dB. m power Level Meters Logarithmic compression, peak reading meters . with a dB scale calibrated for an 8-ohm load m Load Impedance 4 - 16 ohms A INPUT SELECTOR J COMPENSATOR Switch m Stereo Headphones Suitable impedance: 8 - 100 ohms LINE-BAL LINE CD TUNER OPTION K TAPE RECORDER Selector m power Requirements 120 V/230 V (Voltage as indicated on rear panel). B Peak power Meters REC OFF SOURCE TAPE. AC, 50/60 Hz (Decibel Scale, direct reading) L BALANCE Control C VOLUME Control M Attenuator Button m power Consumption 30 watts idle D power Switch N PHONES Jack 220 watts in accordance with IEC-65. E SPEAKER Selector O High Level Input Jacks m Maximum Dimensions Width 475 mm (18-11/16 ). OFF A B A+B P PLAY, REC Jacks F BASS Control Q LINE INPUTS (BALANCED) Height 150 mm (5-7/8 ). G TREBLE Control R SPEAKERS Terminals (A, B) Depth 422 mm (16-5/8 ). H TONE Controls ON/OFF Button S AC power Supply Connector m Weight kg ( lbs) net I STEREO/MONO Button kg ( lbs) in shipping carton m Supplied Remote Commander RC-23 Remote control principle:Infrared pulse Remarks power supply: 3 V DC (IEC R6 batteries 2).


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