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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





Technics SU-7700 (1978)

Technics has expanded thier line of integrated amplifier to include this moderately-priced unit.
It features output meters, an effective subsonic filter, elaborate taping facilities and fine overall performance. Technics is rapidly becoming an important factor in the market, and this amp should help to continue that trend.

50 watts per channel, minimum RMS, both channels driven, at 8 ohms from20 Hz to 20 kHz, with no more than 0,08% THD.


Amplifier Section

Continuous power (1 kHz): 70 W + 70 W at 4 Ω (both channel driven); 53 W + 53 W at 8 Ω

Power (20 Hz - 20 kHz): 60 W + 60 W at 4 Ω (both channel driven); 50 W + 50 W at 8 Ω

Power bandwidth: 8 Hz ~ 55 kHz , -3 dB (both channel driven at 8 Ω)

Total Harmonic Distortion:

0,08% at rated power (20 Hz - 20 kHz);

0,035% at half power (20 Hz - 20 kHz);

0,01% at half power (1 kHz)

Intermodulation distortion: 0,08% (60 Hz : 7 kHz = 4 : 1, SMPTE)

Residual Hum and Noise: 0,6 mV

Damping factor: 25 (4 Ω), 50 (8 Ω)

Input Sensitivity and Impedance:

Phono: 2,5 mV/47 kΩ

Tuner, Aux: 150 mV/47 kΩ

Tape1 Playback: 180 mV/47 kΩ

Tape2 Playback: 150 mV/47 kΩ

Tape1 Rec/Play: 180 mV/47 kΩ

Phono Max. Input Voltage: 150 mV (1 kHz, RMS)

Signal-to-Noise Ratio (IHF, A):

Phono: 78 dB

Tuner, Aux: 97 dB

Frequency Response:

Phono: ±0,2 dB, RIAA standard curve

Tuner, Aux: 5 Hz - 80 kHz, +0 dB, -3 dB; 20 Hz - 20 kHz, ±0,5 dB

Tone Controls:

Bass: +12 dB, -12 dB (50 Hz)

Treble: +12 dB, -12 dB (20 kHz)

Equalizer Subsonic Filter: 30 Hz, -12 dB/oct

High Filter: 8 kHz, -6 dB/oct

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

Output Voltage and Impedance:

Rec Out (Tape 1, 2): 150 mV/1,2 kΩ

Rec/Play (Tape 1) output: 30 mV/82 kΩ

Load Impedance:

Main or Remote: 4 - 16 Ω

Main + Remote: 8 - 16 Ω

General

Power Consumption: 450 W

Power Supply: 110/120/220/240 V, 50/60 Hz

Dimensions (W x H x D): 410 x 139 x 334 mm (16-5/32" x 5-15/32" x 13-5/32")

Weight: 9,7 kg (21,4 lbs)

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