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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Sansui AU-20000 amplifier


High-output , low-distortion circuitry
The AU-20000 is the most powerful integrated amplifier in Sansui's distinguished AU Series. Its constant and reliable power output is a continuous 170 watts, min.RMS, per channel, both channels driven into 8 ohms, over a 20 Hz to 20 kHz bandwidth with no more than 0,05% Total Harmonic Distortion.
Powerful Triple Push-Pull output circuit design
No less than six hand-selected power transistors are used in each output channel. The triple push-pull circuitry here is guaranteed to deliver its rated output at the lowest possible distortion power to spare, always.

Dependable power Supply
Particularly close attention is paid to the power supply design to ensure dependability and stability. The circuit is the plus-minus symmetrical voltage type, coupling a low magnetic leakage toroidal transformer with extra large capacitors.
Dual-Amplifier Phono equalizer with low-noise transistors
Dynamic response is improved by the 8-transitor equalizer with differential amplifiers at its initial stages. Distortion is totally minimized, and the dual amplifier design - a CR type for highs and a NF type for lows achieves very accurate RIAA equilization.

Triple Tone Control
The AU-20000  features Sansui's exxlusive Triple Tone Control design, controlled by a CR type circuit. A wide dynamic range and excellent transient response are assured by the use of a plus minus voltage supply
Complete Triple Protection Circuits
Damage and breakdowns are avoided entirely with the use of a temperature sensing circuit, a DC voltage detection circuit and an ASO (Area of Safety Operation) detection circuit. Shorts in speaker terminals or leads, or power temperature emergencies instantly activate these circuits for complete protection.
Selectable phono sensitivity and Impedance
The phono input circuitry in the AU-20000 incorporates two special selectors, each with three positions, to allow the selection of the correct sensitivity and impedance to obtain optimum results with any cartridge in use.

Versatile tape monitor circuit
The AU-20000 accepts up to the stereo tape deck and provides individual monitoring and deck-to-deck dubbing for each. It also permits source monitoring during the dubbing process.
Other user-oriented features
Provided are:  Tone Defeat Switch; 3-Step Audio Muting Switch; 2-Step Low/High Filters; Mode Switch; Meter Sensitivity Switch, and large, Self-Illuminated level Meters.

Specifications
Power Output: 
170 watts per channel into 4 and 8 Ω
85 watts per channel into 16 ohms
Load Impedance:  4, 8 and 16 Ω
Power bandwidth:  20 to 20,000 Hz at or below rated min. RMS power output and Total Harmonic Distortion
Total Harmonic Distortion: :  less than 0,05% at or below rated min.RMS power output and Total Harmonic Distortion
Intermodulation Distortion (70 Hz : 7 kHz = 4 : 1 SMPTE Method):
Overal (from AUX) less than 0,05% at rated RMS power output
RIAA Curve Deviation (Phono):  +0,2 dB, -2 dB (30 to 15,000 Hz)
Channel Separation (at rated output  1,000 Hz):
Phono 1 :  better than 55 dB
Phono 2 :  better than 55 dB
Tuner :  better than 60 dB
Aux :  better than 60 dB
Power Amplifier :  better than 100 dB
Tape Monitor :  better than 60 dB
Hum and Noise (IHF):
Phono 1 :  better than 70 dB
Phono 2 :  better than 70 dB
Tuner :  better than 80 dB
Aux :  better than 80 dB
Power Amplifier :  better than 100 dB
Tape Monitor :  better than 80 dB
Input Sensitivity and Impedance (1 kHz, for rated output):
Phono 1 ;  1,5 mV, 3 mV, 6 mV / 30 k, 50 k, 100 k Ω
Phono 2 :  1,5 mV, 3 mV, 6 mV / 50 k Ω
Max. Input Capability:  more than 350 mV RMS at 0,05% distortion
Tuner :  130 mV / 50 k Ω
Aux :  130 mV/ 50 k Ω
Tape Playback 1 :  130 mV (PIN)
Tape Playback 2 : 130 mV (PIN); 130  mV (DIN)
Tape Playback 3 :  130 mV (PIN)
Recording Output
Tape 1 :  130 mV (PIN)
Tape 2 :  130 mV (PIN), 30 mV (DIN)
Tape 3 :  130 mV (PIN)
Controls:
Bass :  +10 dB  -10 dB at 30 Hz
Midrange :  +5 dB -5 dB at 1,500 Hz
Treble :  +10 dB  -10 dB at 20,000 Hz
Filters:
Low :  -3 dB at 20 Hz (12 dB/oct);  -3 dB at 40 Hz (12 dB/oct)
High :  -3 dB at 7 kHz (6 dB/oct);  -3 at 12 kHz (12 dB/oct)
Muting:  0 dB, -10 dB, -30 dB
Power Requirements:  100, 120, 220, 240 V 50/60 Hz
Dimensions (W x H x D):  460 x 178 x 400 mm (18-1/8" x 7" x 15-3/4")
Weight:  22,6 kg (49,8 lbs) net


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