When
speaking of the OTS (Optimum Tuning System), an easy-to-use Yamaha feature that
automatically locks in the exact center of the tuned channel - for the lowest
possible distortion.
"the
muting and OST systems operated flawlessly" Stereo Review said, and more
"The harmonic distortion of the CR-840 was so low that without the most
advanced test instruments it would have been impossible to measure it."
Among
Yamaha's most significant features is the continuously variable loudness
control. By using this control, the frequency balance and volume are adjusted
simultaneously to compensate for the ear's insensitivity to high and low
frequency sound at low volume settings. Thus, you can retain a natural-sounding
balance regardless of listening level.
And there'
more. Like the Rec Out/Input Select feature. These separate controls allow you
to record from one program source while listeningto another program source. All
without disturbing the recording process, Stereo Review's comment was, … the
tape recording functions of the CR-840 are virtually independent of its
receiving functions." one could not ask for greater flexibility.
In summing
up their reaction to the CR-840, Stereo review said, "Suffice it to say
that Yamaha make it possible for a moderate-price receiver to provide
performance that would have been unimaginable only a short time ago." And
the CR-840 is only one example in Yamaha's fine line of receivers.
Specifications
Audio
Section
Minimum RMS
Output Power per Channel:
65
Watts at 4 Ω from 20 - 20,000 Hz (at
no more that 0,02% THD)
60
Watts at 8 Ω from 20 - 20,000 Hz (at
no more than 0,02% THD)
Continuous
RMS Power (both channels driven, 1 kHz):
75
Watts at 4 Ω
65
Watts at 8 Ω
Signal-to-Noise
ratio (IHF A Network)
Phono : 94 dB (Input shorted)
Aux, Tape 1
and 2 : 100 dB
Residual
Noise : 0,17 mV
Distortion
20 Hz to 20 kHz:
Phono to Rec
Out : 0,02% 1V output
Aux,
Tape to Sp Out ( 8 Ω) : 0,01% at 30 W
Noise-Distortion
Clearance Range (NDCR) for 0,1% into 8 Ω at 1 kHz:
From 10 mW
to 60 Watts with Vol -20 dB (Phono Input to SP out)
Power
Bandwidth (IHF): 10 Hz to 40 kHz
Damping
Factor (at 1 kHz): better than 40 into 8
Ω
Iunput
Sensitivity / Impedance:
Phono
: 2,5 mV / 47 k Ω
Aux,
Tape 1 and 2 : 120 mV / 40 k Ω
Maximum
Input levels:
Phono : 140 mV at 1 khz
Output level
/ Impedance:
Rec
Out terminals Phono : 120 mV / 220 Ω (rated)
Aux ,
tape : 120 mV / 5 k Ω
Frequency
Response:
Phono RIAA
deviation : 0,4 dB
Aux, tape 1
and 2 to Sp Out : 20 Hz to 20 kHz, ±0,3
dB
Tone Control
Characteristics
Bass
Turnover Frequency : 350 Hz
Bass
Boost/Cut : ±10 dB at 50 Hz
Presence
Center Frequency : 3 kHz
Presence
Boost/Cut : ±6 dB
Treble
Turnover Frequency : 3,5 kHz
Treble
Boost/Cut : ±10 dB at 20 kHz
Filters and
Loudness Control Characteristics:
Low : 25 Hz
(12 dB/octave)
High : 8 kHz (6 dB/octave)
Loudness
Control : Level-related equalization
FM Tuner
Section
Tuning
Range: 87,6 to 108 MHz
Usable
Sensitivity [300 Ω/75 Ω]: 9,3 dBf
(1,6 µV) / 9,3 dBf (0,8 µV)
50 dB
Quieting Sensitivity :
Mono : 15,3
dBf (3,2 µV)
Stereo
: 37,3 dBf (40 µV)
Image
Response ratio (98 MHz): 80 dB
IF Response
Ratio (98 MHz): 100 dB
Spurious
Response Ratio (98 MHz): 100 dB
AM
Suppression Ratio (IHF): 60 dB
Captur
Ratio: 1,5 dB
Alternate
Channel Selectivity:
Locl : 48 dB
(IHF)
DX : 82 dB (IHF)
Signal-To-Noise
Ratio IHF (at 65 dBf):
Mono : 84 dB
Stereo
: 80 dB
Distortion
(at 65 dB)
Mono
100 Hz
: 0,1%
1 kHz : 0,08%
6 kHz : 0,15%
Stereo
100 Hz
: 0,1%
1 kHz : 0,1%
6 kHz : 0,2%
Intermodulation
Distortion (IHF) [Mono/Stereo]: 0,08% /
0,08%
Sub-Carrier
product Ratio: 609 dB
Stereo
Separation
50 Hz : 45 dB
1 kHz : 50 dB
10 kHz
: 45 dB
Blend : 10 dB
Frequency
Response
50 Hz to 10
kHz , ±0,4 dB
30 Hz to 16
kHz , +0,4 -1,0 dB
Muting
Threshold: 19,2 dBf (5 µV)
Auto DX
Sensitivity: 36,1 dBf (35 µV) or at 50
dB /N
AM Tuener
Section
Tuning
range: 525 to 1605 kHz
Usable
Sensitivity (IHF): 15 µV
Selectivity
(1,000 kHz): 30 dB
Signal-to-Noise
Ratio: 50 dB (at 80 dB/m)
Image
response Ratio (1,000 kHz): 40 dB
IF response
Ratio (1,000 kHz): 35 dB
Spurious
Response Ratio (1,000 kHz): 60 dB
Total
Harmonic Distortion: 0,4%
Tuner
Section Output level/Impedance
FM
(100% mod. At Rec Out) : 450 mV /3,9 k Ω
AM
(30% mod. At Rec Out) : 150 mV / 3,9 k Ω
General
Semiconductors:
47
Transistors; 9 ICs; 1 FeT; 14 Diodes, 3
Zener Diodes; 7 LEDs; 5 Ceramic Filters
Power
Supplies: AC 120 V, 220 V 50/60 Hz
Power
Consumption: 340 W at 120 V
Dimensions
(W x H x D): 510 x 167 x 386 mm
(20" x 6-9/16" x 15-1/4")
Weight: 13,6 kg (30 lbs)