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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





Aiwa SA-C50 pre amp

Stereo Preamplifier

Designed as a capable complement to SA-P50, this preamplifier can boast of adding minimal sound coloration and noise to the original signals.

Low harmonic distortion  - only 0,008% - for Tuner, Aux and Tape In is maintained for Phono as well. Use of a new low noise, low distortion IC and ultra low noise transistors in a differential amplifier configuration has made possible the superb 88 dB Signal-to-Noise Ratio with MM cartridges. RIAA deviation has been held to a close ±0,2 dB (20 - 20,000 Hz) byuse of specially selected polypropylene capacitors and high precision metal film resistor elements.

Moving coil cartridges can be directly connected to the unit without the need for an expensive transformer or head amplifier. Selector button on front panel may be switched to MM or MC, thus permitting quick changeover from one type of cartridge to the other. As connections for two tape deck units (Tape 1, 2) are also provided, in-system dubbing may be performed without changing cable connections. Another important feature is the use of a muting relay circuit which effectively silences On/Off switching during mode selection operation and protects the speakers.

Features:

Low filter with 6 dB/oct (30 Hz ) cut-off

Click-stop tone controls defeatable at center position

-20 dB muting switch

Mode indicator LEDs

Loudness control

 


Specifications

Input Sensitivity/Impedance

Phono MM :  2,5 mV/47 k Ω

Pono MC :  0,25 mV/100 k Ω

Tuner, Aux 1, 2 :  150 mV/47 k Ω

Tape In 1, 2 :  150 mV/47 k Ω

Output Level/Impedance

Tape Out 1, 2 :  150 mV/47 k Ω

Pre Out :  0,9 V/47 k Ω

Total Harmonic Distortion

Tuner, Tape, Aux 1, 2 :  0,008% (20 Hz - 20 kHz)

Phono MM :  0,002% (1 kHz Tape out)

Frequency Response:

Aux, Tape IN :  10 Hz - 100 kHz (+0 -3 dB)

RIAA Deviation:  ±0,2 dB (20 Hz - 20 kHz)

Signal-to-Noise Ratio

Phono MM :  88 dB

Phono MC ;  70 dB

Tuner, Tape, Aux 1, 2 :  103 dB

Phono Max. Input

MM:  200 mV (at 1 kHz, T.H.D. 0,1%)

MC :  20 mV (at 1 kHz, T.H.D. 0,1%)

Muting :  -20 dB

Tone Controls:

Bass :  ±10 dB at 50 Hz

Treble :  ±10 dB at 20 kHz

Filter

Low :  30 Hz , 6 dB/oct

Loudness +6 dB (at 100 Hz); +3 dB (at 20 kHz)

Power Requirements:  AC 240 V, 50/60 Hz

Dimensions (W x H x D):  250 x 71 x 257 mm (9-7/8" x 2-13/16" x 10-3/16"

Weight:  2,2 kg (4,9 lbs)

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