"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.
Specifications
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
Indicators:
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.
General
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)