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 ST-K 808


Technics Quartz Synthesizer FM/AM Stereo Tuner Preamplifier ST-K 808

Specifications
Amplifier Section
Total Harmonic Distortion:  0,05%
Input Sensitivity/Impedance:
Phono :  2,5 mV/47 k Ω
Aux :  150 mV/27 k Ω
Tape Rec/Play :  180 mV/27 k Ω
Phono Max. Input Voltage (1 kh, RMS):  95 mV
Signal-to-Noise Ratio (rated output , 4 Ω):
Phono :  75 dB (IHF-A, 78 dB)
Tuner, Aux, Tape :  85 dB (IHF-A, 97 dB)
Signal-to-Noise Ratio (26 dB rated output, 4 Ω):
Phono : 62 dB
Tuner, Aux, Tape :  63 dB
Frequency Response:
Phono :  RIAA standard curve, 30 Hz - 15 kHz (±1,0 dB)
Tuner, Aux, Tape :  10 Hz - 50 kHz (- 1 dB); 20 Hz - 20 kHz (±0,4 dB)
Tone Controls
Bass : +10 dB: -10 dB  at 50 Hz
Treble :  +10 dB: -10 dB at 20 kHz
Subsonic Filter:  30 Hz, 6 dB/cot
High-Cut Filter:  7 kHz, 6 dB/oct
Loudness Control (volume at 30 dB):  50 Hz, - 9 dB
Output Voltage:
Output :  rated 0,5 V/600 Ω; max 10 V/600 Ω
Tape Rec/Play :  30 mV/82 k Ω
Channel Balance, Aux 250 Hz-6,300 Hz :  ±1,0 dB
Channel Separation, Aux 1 kHz :  55 dB
FM Tuner Section
Frequency Range:  87,5 - 108,0 MHz
Sensitivity:  1,9 µV (IHF, usable)
S/N 30 dB :  1,9 µV (300 Ω); 1,3 µV (75 Ω)
S/N 26 dB :  1,7 µV (300 Ω); 1,2 µV (75 Ω)
S/N 20 dB :  1,5 µV (300 Ω); 0,9 µV (75 Ω)
IHF 46 dB Srereo Quieting Sensitivity [mono/stereo]:  0,15% / 0,3%
Signal-to-Noise Ratio [mono/stereo]:  67 dB (73 dB, IHF) / 63 dB (68 dB, IHF)
Frequency Response:  20 Hz - 15 kHz, +0,5 dB, -1,5 dB
Alternate Channel Selectivity:  75 dB
Capture Ratio: 1,0 dB
Image Rejection at 98 MHz:  68 dB
IF Rejection at 98 MHz:  85 dB
Spurious Response Rejection at 98 MHz:  95 dB
AM Suppression:  55 dB
Stereo Separation:
At 1 kHz : 45 dB
At 10 kHz :  35 dB
Carrier Leak
At 19 kHz :  30 dB (35 dB, IHF)
At 38 kHz :  45 dB (50 dB, IHF)
Channel Balance (250 Hz - 6,300 Hz):  ±1,0 dB
Limiting Point:  1,2 µV
Power Bandwidth:
IF Amplifier :  180 kHz
FM Demodulator :  1000 kHz
Antenna Terminals:  300 Ω (balanced) and 75 Ω (unbalanced)
AM Tuner Section
Frequency Range:  522 - 1611 kHz
Sensitivity (S/N 20 dB):  30 µV, 300 µV/m
Selectivity (±9 kHz):  55 dB
Image Rejection at 1,000 kHz:  45 dB
IF rejection at 1,000 kHz:  45 dB
Timer Section
Clock:  Quartz-Lock Type, 24-hour indication
Precision:  within 0 sec - 10 sec monthly (at 25°C)
Functions:  24-hour programmable; every day (2 times), once only (1 time)
Programmable Content:  on off of program source (FM, AM, Phono, Aux)
Setting Intervals:  1 minute,23 hours, 59 minutes (at 1-min. Intervals)
Prioryty Order:  once, every day 2, everyday 1
Memory "back-up":  About 3 months (without AC power)
General
Power Supply:  110, 120, 220, 240 V AC, 50/60 Hz
Power Consumption:  20 W
Batteries for memory back-up (optional):  3 x AA size batteries DC 4,5 V
Dimensions (W x H x D):  430 x 75 x 310 mm (16-15/16" x 2-15/16" x 12-7/32")

Weight:  4,8 kg (10,6 lb)

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