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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-828


Quartz synthesizer digital tuning provides exact and drift-free reception. A choice of three tuning modes: 14 preset stations (7 FM and 7 AM), up/down manual, and auto-scan. Digital frequency readout plus analog display. LEDs for signal strength, quartz-lock and preset channels. New Class A and Linear feedback amplifier design. Space Dimension Control expands the stereo image to a maximum of 240°. Dimension and power level dispaly. Input-capacitorless phono equalizer first stage allows direct MC cartridge connection. Electronic protection circuit. Protection/safety indicators. Two-way tape dubbing IF band selector. Soft touch volume control.

Beyond quartz, the world's most precise tuning system, lies a new ability to expand sound.
Imagine you're in a room with Technics SA-828 receiver.
What you hear is beautiful stereo. Then you activate Technics variable Dimension Control. Incredibly, the sound begins to move. The stereo image widens to the point where the music begins to surround you. You're intrigued by its richness and depth. You're enveloped by a new experience in sound. That's the wonder of the patented technology in Technics Dimension Control.
Just as wondrous is quartz synthesis, the world's most precise tuning system. That's how the SA-828 quartz synthesizer eliminates FM drift as well as the hassle of tuning. You can even preset and instantly retrive 7 FM and 7 AM stations, all perfectly in tune.

Another perfect example of Technics technology is our synchro-bias circuitry. What it does is constantly  send minute amounts of power to the amplifier transistors. And since they can't switch on or off, switching distortion is eliminated.
And when it comes to power, thr SA828 has plenty;  100 watts per channel minimum RMS into 8 ohms from 20 Hz to 20 kHz with no more than 0,005% total harmonic distortion.
The SA-828 goes on to show its sophistication with a super-quiet phono equalizer, soft touch program selectors, fully electronic volume control, and a Dimension Control display that doubles as a power level meter.


Specifications
Power Output (min. RMS per channel, 8 ohms, both channel driven):
100 W per chennel, from 20 Hz to 20 kHz
Continuous Power Output:
105 W per channel  at 8 ohms (1 kHz, 0,001% T.H.D.)
Dynamic Headroom:  1,3 dB (8 Ω)
Total Harmonic Distortion: 
Rated Power at 20 Hz to 20 kHz :  0,005% (8 Ω)
Half Power at 20 Hz to 20 kHz :   0,005% (8 Ω)
Half Power at 1 kHz :  0,01% (8 Ω)
Intermodulation Distortion SMPTE :  0,01% 98 Ω)
Frequency Response
Phono :  RIAA standard curve ±0,2 dB
Aux, Tape :  5 Hz - 100 kHz - 3 dB (20 Hz - 20 kHz, +0,2 dB, -0,2 dB)
Input Sensitivity
Phono MC :  17 µV 9170 µV, IHF'66)
Phono MM :  0,25 mV (2,5 mV, IHF ;66)
Aux, Tape :  15 mV (150 mV, IHF '66)
Signal-to-Noise Ratio (IHF A)
Phono MC :  75 dB (70 dB, 250 µV input Ihf '66)
Phono MM :  78 dB (87 dB IHF '66)
Aux, Tape :  80 dB (110 dB, IHF '66)
Maximum Input Voltage
Phono MC :  10 mV (11 mV, 1 kHz)
Phono MM :  145 mV 9160 mV, 1 kHz)
Input Impedance
Phono MC :  47  Ω
Phono MM :  47 k Ω
Aux, tape :  22 k Ω
Tone Control
Bass :  50 Hz +10 dB -10 dB
Treble :  20 kHz +10 dB -10 dB
Subsonic Filter:  30 Hz, -6 dB/oct
High Filter:  7 kHz -6 dB/oct
Loudness Control (vol. At - 30 dB):  50 Hz +9 dB
Muting:  -20 dB
Output Voltage
REC Out :  150 mV
Low Frequency damping Factor:  40 at 8 Ω; 20 at 4 Ω
Load Impedance
Main or Remote :  4 - 16 ohms
Main and Remote :  8 - 16 ohms
FM Tuner Section
Frequency Range:  87,9 - 107,9 MHz or 87,5 - 108,0 MHz
FM Sensitivity:  10,8 dBf (1,9 µV )
50 dB Quieting Sensitivity
Mono :  13,7 dBf (2,7 µV)
Stereo :  37,2 dBf (39,7 µV)
FM T.H.D.
At 100 Hz [mono/stereo]:  0,08% / 0,15%
At 1 kHz [mono/stereo]:  0,08% / 0,1%
At 6 kHz [mono/stereo]:  0,2 % / 0,2%
Signal-to-Noise
Mono :  77 dB
Stereo :  71 dB
Capture ratio:  1,2 dB
Alternate Channel Selectivity: 
Wide ±400 kHz :  75 dB
Narrow ±300 dB :  80 dB
Frequency Response:  20 Hz - 15 kHz, +0,2 -0,8 dB
Image rejection at 98,1 MHz :  80 dB
IF Rejection at 98,1 MHz :  90 dB
Spurious Response rejection at 98,1 MHz :  100 dB
Am Suppression:  60 dB
Stereo Separation
At 1 kHz :  45 dB
At 10 kHz :  40 dB
Carrier Leak
At 19 kHz :  -65 dB
At 38 kHz :  -70 dB
Antenna Terminals:  300 Ω (balanced); 75 Ω (unbalanced)
AM Tuner Section
Frequency Range:  530 - 1620 kHz or 522 - 1611 kHz
Sensitivity:  30 µV ; 250 µV/m
Selectivity:  56 dB
Image Rejection at 1000 kHz:  50 dB
IF rejection at 1000 kHz :  40 dB
General
Power Supply:  AC 120 V 60 Hz or 120 V/ 230 V 50/60 Hz
Power Consumption:  400 W, 500 VA
Dimensions (W x H x D):  530 x 181 x 388 mm (20-7/8" x 6-11/32" x 15-9/32")
Weight:  15 kg (33,1 lbs)

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