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

Kyocera R-851

"Very simply, our R-851 is not for everyone. Not for every dealer. Not for every audio buyer. Only for those who demand the best. Those who want sound that's pure and distinctive ... who hear subtleties other miss. For those discriminating listeners, the R-851 is well worth the quest."

Hear the silence before you hear the sound
Switch on the R-851, switch from one function to another. Try Phono,Tape 1,Tape2, Auxiliary. Back to Phono. Absolute silence (of course, you'll get sound on AM/FM). The silence is the mark of a great receiver. And great engineering. The kind of quiet an audiophile loves to hear.

Sound that takes you closer to the source.
We.ve turned on the R-851 for some very experienced - even jaded -  audio cars, and all we can say is it stops'em every time. The sound is different. The sense of being there is almost overpowering. All this comes from 85 watts per channel of power (with dynamic power far above this figure) and some of the most sophisticated circuitry in the business. Above all, it uses MOS FETs, the new breed of output transistors, in the amplifier section. They can handle the transients, the power surges, the power requirements of present-day sound  (and tomorrow's digital sound) better than bipolar transistors ever could and give you a sonic purity like no other (many claim MOS FETs have picked up the warm, rich sound of the great tube amps and gone a step beyond!)

Fine tuned for every audio need
From front end to output jacks, the R-851 offers every feature an audio enthusiast might want. The most commonly used controls are right up front - the more esoteric ones are placed behind a neat flip-down front panel. There's microprocessor controlled quartz-locked tuning with 14 station programmable memory (7 Am and 7 FM): automation station seek; fluorescent display panel; and two-way tape monitoring and dubbing.

Audio Section
Power output (RMS, both channels driven with minimum THD at 8Ω per channel):  85 watts
Total Harmonic Distortion  (at rated output):  0,015%
Frequency Response:  20 - 20,000 Hz  ±0,3 dB
Intermodulation Distortion (at rated output):  0,015%
Slew Rate:  60 V/micro-sec
Rise Time:  1,0 micro-sec
Input Sensitivity (at rated output):
Phono MC : 125 mV/100 Ω
Phono MM : 2,5 mV/47 kΩ
Others : 150 mV/30 kΩ
Maximum input voltage (at 1 kHz, 0,5% THD):
Phono MC : 10 mV
PHono MM : 200 mV
Hum and Noise Ratio (IHF, short circuited, A-weighted, for rated output):
Phono MC : 68 db
Phono MM : 86 dB
Other : 100 dB
Damping Factor (8Ω at 1 kHz):  50
Parametric Equalizer:
Bass (at 800 Hz turn-over):  ±10dB at 100 Hz
Mid-range (at 800 Hz turn-over):  ±10 db at 800 Hz
Treble (at 2 kHz turn-over):  ±10 dB at 10 kHz
Turn-over control
Bass Control:  100 Hz - 500 Hz
Treble Control:  2- 10 kHz variable
Center Frequency - Mid-range:  500 - 2,000 Hz variable
Loudness Compensation (volume control at -30 dB)
100 Hz : +7 dB
10 kHz : +3,5 dB
High Filter (6 dB/oct):  -6 dB (10 kHz)
Subsonic Filter( 12 dB/oct): -3 dB (20 Hz)
Tape Recording output (level at rated input sensitivity):  130 mV
FM Section
Tuning Range:  87,5 - 108 MHz
Usable Sensitivity mono:  9,8 dBf
50 dB Quieting Sensitivity
Mono : 14,8 dBf
Stereo : 35 dBf
Capture Ratio (normal IF bandwidth):  1,0 dB
Distortion (normal IF bandwidth):
Mono 1 kHz : 0,6%
Stereo 1 kHz : 0,06%
Separation at 1 kHz:  58 dB
High-lbend at 1 kHz separation:  20 dB
Frequency Response:  30 hz - 15 kHz, +0/-0,5 dB
Signal-to-noise Ratio:
Mono : 88 dB
Stereo : 76 dB
Stereo Threshold:  20 dBf or 40 dBf
Muting Threshold
High : 40 dBf
Low : 20 dBf
Selectivity, alternative channel (narrow IF bandwidth):  85 dB
Spurious Rejection:  95 dB
IF Rejection:  120 dB
Image Rejection:  85 dB
Subcarrier Product Ratio:  65 dB
Recording Output Voltage:  0,75 V
Antenna provision Unbalanced:  75 Ω
Signal : 5-dot LED (green)
Stereo : LED (red)
Station : LED (green)
Station Preset : 7 LEDs (red)
AM Section
Tuning Range:  520 - 1,710 kHz
Sensitivity, (loopstic antenna, S/N =20 dB):  300 microvolt/m
Image Rejection:  50 dB
Signal-to-noise Ratio:  50 dB
IF Rejection:  85 dB
Selectivity:  ±20 kHz  45 dB
Distortion:  0,3%
Frequency Response (at -6 dB):  20 Hz to 2,3 kHz
Recording Output Voltage:  0,3 V
Antenna provision
a - built-in ferrite loopstick antenna;
b - external antenna terminal
Signal Strength Indication:
5-dot LED (green)
Digital Control Section
Frequency Space
AM 10 kHz
FM 100 kHz
End-to end Sweep time:
AM 12 sec.
FM 20 sec.
Power Requirement:  AC 110 - 120 220 - 240 V 50/60 Hz
Dimensions (W x H x D):  460 x 132 x 360 mm (18-1/8 x 5-3/16 x 14-3/16 inch)
Weight:  12,3 kg ( 27 lbs)

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