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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 SA-250 receiver

Quartz Synthesizer FM/AM Stereo Receiver, features:
37 watts per channel at 8 ohms, 1 kHz
7 FM and 7 AM station presets
Auto-scan tuning
Signal processing display
Soft-touch switches and slide controls for convenient operation

Specifications:
Continuous Power  Output (both channels driven, 1 kHz):  2 x 37 W (at 8 Ω)
Total Harmonic Distortion (half power at 1 kHz, 8 Ω):  0,02%
Intermodulation Distortion (rated power, 60 Hz : 7 kHz = 4:1, SMPTE, 8 Ω) :  0,5%
Power bandwidth (both channel driven, -3 dB):  10 Hz - 40 kHz 98 Ω)
Damping Factor:  30 (8 Ω)
Input Sensitivity/Impedance
Phono :  2,5 mV/47 k Ω
Tuner, Tape, CD, Aux :  150 mV/18 k Ω
Phono Max. Input Voltage (1 kHz, RMS):  150 mV
Signal-to-Noise Ratio (rated power, 8 Ω, IHF A):
Phono :  70 dB
Tuner, Tape, CD, Aux :  88 dB
Frequency Response :
Phono :  30 Hz - 15 kHz,  ± 0,8 dB (RIAA standard curve)
Tuner, Tape, CD, Aux :  5 Hz - 70 kHz
Tone Controls
Bass :  ±10 dB at 50 Hz
Treble :  ±10 dB at 20 kHz
Loudness Control (volume at -30 dB):  50 Hz ±9 dB
Output Voltage
Tape/Ext (Rec Out):  150 mV
Channel Balance (250 Hz - 6,300 Hz) ±1 dB
Channel Separation:  55 dB
Headphones Output Level/Impedance:  420 mV/330 Ω
Load Impedance
Main or Remote :  8 Ω - 16 Ω
Main and Remote :  8 Ω - 16 Ω
FM Tuner Section
Frequency Range:  87,5 - 108 MHz
Sensitivity (S/N 20 dB):  1,5 µV (300 Ω);  0,9 µV (75 Ω)
Total Harmonic Distortion
Mono :  0,15%
Stereo : 0,3%
FM Signal-to-Noise  (IHF)
Mono  :  60 dB
Stereo :  58 dB
Frequency Response:  20 Hz - 15 kHz -1 dB, -2 dB
Alternate Channel Selectivity (±400 kHz):  65 dB
Capture Ratio:  1 dB
Image Rejection (98 MHz):  50 dB
IF Rejection (98 MHz):  75 dB
Spurious Response rejection (98 MHz):  62 dB
AM Suppression :  50 dB
Stereo Separation:
At 1 kHz :  40 dB
At 10 kHz :  30 dB
Carrier leak:
At 19 kHz :  -33 dB (-35 dB, IHF)
At 38 kHz :  50 dB (50 dB, IHF)
Channel balance (250 Hz - 6,300 Hz):  ±1,5 dB
Limiting Point:  1,2 µV
Bandwith
IF Amplifier :  180 kHz
FM Demodulator :  1000 kHz
Antenna Terminals:  300 Ω (balanced), 75 Ω (unbalanced)
AM Tuner Section
Frequency Range:  522 - 1611 kHz (9 kHz step)
Sensitivity (S/N 20 dB):  20 µV,  300 µV/m
Selectivity:  55 dB
Image Rejection (999 kHz):  40 dB
IF Rejection (999 kHz):  60 dB
Power Supply:  AC, 220 - 240 V, 50/60 Hz
Power Consumption:  180 W
Dimensions (W x H x D):  430 x 97 x 243 mm (16-15/16" x 3-13/16" x 9-9/16")
Weight:  5 kg (11 lbs)
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