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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 CA-3000

Stereo Control Preamplifier RIAA 0,2 dB Equalization

OUR FINEST STEREOCONTROL PREAMPLIFIER

Contemporary disc recordings which feature extremely wide dynamic range make strenuous demands on all links in the reproduction chain, especially in the pre and power amplification stages. Dynamic range and other critical high fidelity parameters, such as a wide frequency response, low distortion and the ability to handle all musical signals without clipping and without an increase in noise, must also be applied to any preamplifier if one is to accurately judge its quality. Add to these the control versatility needed in a complex component set-up, and the power stability required for dependable performance, and you have described the CA-3000.

CIRCUIT CONCEPT

To maximize the qualities of every link of the circuit chain, each circuit in the CA-3000 has been constructed with newly developed unit amplifiers featuringextremely high input impedance and low output impedance. Each uses a differential amplifier at its input and an emitter-follower or a SEPP buffer amplifier at its output. From the standpoint of performance this means that an individual circuit remains unaffected by the preceding circuits. Each thus handles the applied signals with the highest accuracy and the lowest possible distortion.

EQUALIZER

The vital phono equalizer is a newly-designed unit with a packed differential dual FET amplifier (with a matched pair of low-noise FET's) at its initial stage and a Class-A complementary SEPP amp at its output. The initial stage amplifies the phono signal with high gain and passes it on to a CR filter for an extended high-frequency equalization. From the second FET amplifier is applied NF (negative feedback), boosting bass for an accurate low-frequency equalization. This CR-NF sequence eliminates the dips and peaks in the RIAA equalization curve, improves phase characteristic and adds almost no distortion. Results: crisp and realistic tonal quality from any or all of the cartridge now on the market, with maximum deviation from the RIAA curve of ±0,2 dB over a 30 to 15,000 Hz spectrum.

DYNAMIC MARGIN

A plus/minus 50 V (total 100 V) power supply voltage is applied to the phono equalizer amplifier. With its Class-A complementary SEPP output stage, the equalizer thus has a maximum phono input capability as high as 1,000 mV (input sensitivity switch at 6 mV).This design guarantees wide dynamic margin. large input signals (fortssissimo) are never clipped; small inputs (pianississimo) are never buried.

SPECIFICATIONS

TOTAL HARMONIC DISTORTION OVERALL (FROM AUX): less than 0,03% at or below rated output level

INTERMODULATION DISTORTION (79 hZ: 7,000 hZ = 4:1 SMPTE method):

OVERALL (FROM AUX) less than 0,03%

FREQUENCY RESPONSE (at rated output):

OVERALL (AUX to PRE OUTPUT) 10 to 100,000 Hz +0,5 dB - 1dB

RIAA CURVE DEVIATION (PHONO): +0,2 dB, -0,2 dB (30 to 15,000)

CHANNEL SEPARATION (at rated output 1,000 Hz)

PHONO 1: better than 60 dB

PHONO 2: better than 60 dB

TUNER: better than 60 dB

AUX: better than 60 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 90 dB

AUX: better than 90 dB

TAPE MONITOR: better than 90 dB

INPUT SENSITIVITY AND IMPEDANCE (1,000 Hz for rated output):

PHONO 1: 1,5 mV, 3,0 mV, 6,0 mV (30k ohms, 50k ohms, 100k ohms)

PHONO 2: 1,5 mV, 3,0 mV, 6,0 mV (50k ohms)

MAX. INPUT CAPABILITY (more than 1,000 mV RMS at 0,1%):

total harmonic distortion (input 6 mV)

AUX: 130 mV (50k ohms)

TUNER: 130mV (50k ohms)

TAPE PLAYBACK 1: 130 mV, (PIN)

TAPE PLAYBACK 2: 130 mV, (PIN); 130 mV (DIN)

TAPE PLAYBACK 3: 130 mV, (PIN)

OUTPUT LEVEL

RATED OUTPUT (0,003% Total Harmonic Distortion)

PREAMPLIFIER OUTPUT: 1,3 V

RECORDING OUTPUT: 130 mV

(DIN): 30 mV

MAXIMUM OUTPUT

PREAMPLIFIER OUTPUT: 8 v (0,1% Total Harmonic Distortion)

CONTROLS

BASS: +10 dB, -10 dB at 50Hz (TONE SELECTOR at 400 Hz)

MIDRANGE: +5 dB, -5dB at 1000 Hz

TREBLE: +10 dB, -10 dB at 20,000 Hz (TONE SELECTOR at 2kHz)

TONE SELECTORS

BASS: 100 Hz, 200 Hz, 400 Hz

TREBLE: 2 kHz, 4 kHz, 8 kHz

FILTERS LOW: -3 dB at 20 Hz (12 dB/oct); -3 dB at 40 Hz (12 dB/oct)

filters high: -3 dB at 7 kHz (6 dB/oct); -3 dB at 12 kHz (12 dB/oct)

MUTING: 0 dB, -10 dB, -30 dB

AC OUTLETS: Switched max. 500 watts; Unswitched total 500 watts

SEMICONDUCTORS: 103 TRANSISTORS; 4 FET's; 18 diodes ; 8 Zener Diodes; 4 ICs

POWER REQUIREMENTS

POWER VOLTAGE: 100, 120, 220, 240 V, 50/60 Hz

POWER CONSUMPTIO: 50 watts

DIMENSIONS: 460 x 178 x 373 mm (18⅛ x 7⅛ x 14⅗)

WEIGHT: 13,3 kg (29,3 lbs)Net; 15,3 kg (33,7 lbs) Packed

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