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





Technics SU-9011 (1978)

Stereo preamplifier TECHNICS SU-9011

Input sensitivity/impedance;

Phono1 man-month: 2.5 mV / 47 kohm

Phono1 MC: 70 microvolts/ten ohms

Phono2 man-month: 2.5 mV / 47 kohm

Tuner, Aux: 150 mV / 47 kohm

Tape1, 2, Playback: 150 mV /47 kohm

Mic: 4 mV / 10 kohm

Phono maximum permissible input (1kHz, RMS):

Phono1 MM: 200 mV

Phono1 MC: 6 mV

Phono2 MM: 200 mV

Rated THD: 0.008%

S/N ratio (IHF-A):

Phono1 MM: 88 dB

Phono1 MC: 80 dB (at the time of a 250-microvolt input), -152dBV (input conversion)

Phono2 MM: 88 dB

Tuner, Aux: 100 dB

Mic: 73 dB

THD (20 Hz - 20,000 Hz):

Tuner, Aux: 0.005% (5 V output, Volume 0 dB), 0.008% (1 V output, Volume -30 dB)

Phono1, 2 man month: 0.008% (5 V output, Volume 0 dB), 0.01% (1V output, Volume-30dB)

Phono1 MC: 0.03% (5 V output, Volume 0 dB), 0.02% (1V output, Volume-30dB)

Frequency characteristic:

Phono1, 2: RIAA standard curve ±0.2 dB

Tuner and Aux: 20 Hz - 20,000 Hz +0 -0.2 dB, 2 Hz - 120 kHz +0 -3 dB

Tone control; Bass: ±8 dB (50Hz), Treble: ±8 dB (20kHz)

Subsonic Filter : 30 Hz - 12 dB / oct

A high filter: 7 kHz - 6 dB / oct

Loudness control (-30dB): +8 dB(100Hz)

An Output voltage/impedance;

Output: 1 V/600 ohm (rate), 5 V/600 ohm (maxima)

Mixing rec out: 1 V/600 ohm (rate), 5 V/600 ohm (maxima)

Tape1, 2 rec out: 150 mV

Power source: AC 100 V, 50/60 Hz

Power consumption: 13 W

Dimensions (W x H x D): 430 x 97 x 285 mm

Weight: 4.5kg

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