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Ariel Cabello

Vintage Kenwood '80 receiver with led VU meters.

All functions are okay. Good FM reception.
Cool red/green tuning indicator.

The KR-710 offers high quality sound and quick, precise station selection with the "Star Tracer" tuning system.
 
For most people who invest in high-fidelity equipment, the primary concern is with the sound quality. Here, the KR-710 is certainly a star performer. For example, its Kenwood designed High Speed and DC amplifier is responsible for astonishingly accurate, authentic sound reproduction, as well as clear, distinct sound even at the lowest tones perceived by the ear. And, there are few other receivers, if any, in this range offering such low-noise record reproduction; or such crystal-clear FM broadcast reception that is free of drift problems.
But the KR-710 offers another rarely-found advantage; that of incredibly easy operation - especially when tuning a station. Kenwood's exclusive Star Tracer touch-sensor servo-lock tuning system, simplified multi-point LED metering system and feather-touch push-buttons are designed to remove most of the old-style tuning chores right out of the hands of the operator.
 


The Star Tracer touch-sensor servo-lock tuning system
With its built-in directional LED signals, the Star Tracer module gives you instant electronic feedback on the position of each active station that it contacts. Just follow the signal indicator to guide the Star Tracer module to dead-center of the frequency. But the Star Tracer's job doesn't stop there. After you release the tuning knob, the servo-looking system takes over, holding the selected channel to the exact center-of-channel point where distortion is least. Once locked, the Star Tracer module's central red LED indicator turns to green, telling you the station is now free from drift and immune to the effects of very strong stations at nearby points on the dial.
 
High Speed design accurate and authentic music
The fact that the KR-710 incorporates this highly advanced power amplifier circuit must give it a distinct advantage over other similar receivers. Kenwood's High Speed technique is what gives the power amplifier its extraordinary ability to respond instantaneously to all music signals, even complex transient ones. The rapid changes dictated by music signals can place heavy demands on any amplifier. Only careful design can make power output transistors respond at high speed - and this is exactly what the KR-710 can do. For proof, look for the new Rise Time and Slew Rate specifications - and note the plus-minus qualifier that denotes perfect symmetry of output.
 
DC amplification provides clear sound at low frequencies
DC amplification is responsible for distinct sound reproduction down to the lowest audible tones, because this highly stable power amplifier can reproduce even subsonic tones with minimal phase (time delay) distortion.

Specifications
Audio Section
Power Output:  28 watts per channel minimum RMS , both channels driven at 8 ohms from 20 Hz to 20 kHz with no more than 0,08% T.H.D.
Total Harmonic Distortion (20 Hz to 20 kHz from Tape)
Power @ 4 Ohm is 40 Watts pc.
Rated Power into 8 Ω  :  0,08%
1 watt Power into 8 Ω  :  0,04%
Intermodulation Distortion (60 Hz : 7 kHz = 4 : 1 SMPTE)
Rated Power into 8 Ω  :  0,04%
1 watt Power into 8 Ω  :  0,02%
Slew Rate:  ±50 V/µsec
Rise Time:  1,6 µsec
Damping Factor ( 8 Ω , 1 kHz):  45
Input Sensitivity/Impedance:
Phono :  2,5 mV/50 k Ω
Tape :  150 Mv/50 k Ω
Signal-to-Noise Ratio (A weighted)
Phono :  78 dB for 2,5 mV input; 84 dB for 5,0 mV input
Tape :  104 dB for 150 mV input
Maximum Phono Input Level at 1 kHz:  200 mV (RMS, T.H.D. 0,08%)
Frequency Response;
Phono RIAA Standard Curve :  30 Hz - 15,000 Hz ±0,4 dB
Tape, AUX :  7 Hz - 200 kHz -3 dB
Tone Control
Bass :  ±8 dB at 100 Hz
Treble ;  ±8 dB at 10 kHz
Loudness Control (Vol at -30 dB):  +10 dB at 100 Hz
High Filter:  5 kHz 6 dB/oct
Output Level/Impedance
Tape Rec Out (Pin):  150 mV/300 Ω
FM Tuner Section
FM Frequency Range:  88 MHz - 108 MHz
Usable Sensitivity:  10,8 dBf (1,9 µV)
50 dB Quieting Sensitivity
Mono :  17,2 dBf (4,0 µV)
Stereo :  37,2 dBf (40 µV)
Signal-to-Noise Ratio at 65 dBf
Mono :  76 dB
Stereo :  71 dB
Total Harmonic Distortion at 1 kHz
Mono :  0,1%
Stereo :  0,15%
Frequency Response:  30 Hz - 15 kHz +1 -2 dB
Capture Ratio:  1,0 dB
Image Rejection Ratio:  48 dB
Spurious Response Ratio:  70 dB
IF Response Ratio:  90 dB
Alternate Channel Selectivity:  52 dB at 400 kHz
AM Suppression Ratio:  50 dB
Stereo Separation Ratio
At 1 kHz :  45 dB
At 50 Hz - 10 kHz :  35 dB
Subcarrier product Ratio:  45 dB
Antenna Impedance:  300 Ω  (balanced): 75 Ω  (unbalanced)
AM Tuner Section
Usable Sensitivity:  20 µV
Signal-to-Noise Ratio :  50 dB
Image Rejection:  40 dB
Selectivity:  45 dB
General
Power Requirements:  100 - 120 V, 220 - 240 V, 50/60 Hz
Power Consumption:  160 watts, 8 Ω  rated power output; 24 watts at no signal
AC Outlet: 1 switched, 1 unswitched
Dimensions (W x H x D):  458 x 123 x 298 mm (18-⅓2" x 4-27/32" x 11-23/32")
Weight (Net):  7,5 kg (16,5 lbs)


Manufacturer: Kenwood
Model: KR-710
Year of manufacture: 1980 - 1982
Made in: Korea
Color: Silver
Remote control: no
Power consumption: 160 W max.
Dimensions (WxHxD): 440 x 110 x 298 mm
Weight: 7.2 kg
Original price approx.: 600 DM

Connections

Number of inputs:
Phono MM: 2.5 mV, 50 kOhm
AUX: 150 mV, 50 kOhm

Tape Play 1, 2: 150 mV, 50 kOhm
FM antenna: 75 Ohm, 300 Ohm

MW antenna: 300 Ohm
Number of outputs:
Tape Rec 1, 2: 150 mV
Headphones (6,3mm jack):
2 pairs of speakers

Technical Data

Amplifier

Continuous power (at distortion)
8 Ohm: 2x 28 W 4 Ohm: 2x 40 W

Dynamic power
8 Ohm:
4 Ohm:
Total harmonic distortion: 0.08 %
Attenuation factor: 45 at 8 Ohm
Frequency response: 5 - 250'000 Hz, + 0 dB, - 3 dB
Signal-to-noise ratio:
Phono MM: 78 dB
Line: 104 dB
Tone control:
Bass: ± 8 dB at 100 Hz
Treble: ± 8 dB at 10 kHz

Loudness: + 10 dB at 100 Hz
High Filter: yes
Low Filter (Subsonic): -
Mute:

Tuner

Reception: FM, MW
Frequencies:
FM: 87.5 - 108 MHz
MW: 530 - 1610 kHz
Input sensitivity:
FM: 2.0 µV
MW: 20 µV
Frequency response: 30 - 15'000 Hz
Distortion factor:
Mono: 0,1 %
Stereo: 0.2

Signal-to-noise ratio:
FM:
Mono: 76 dB
Stereo: 71 dB
MW: 50 dB
Channel separation: 36 dB
selectivity: 60 dB
Co-wave selection: 1.0 dB
Spurious wave selection: 78 dB
IF attenuation: 80 dB
IF attenuation: 85 dB
MW suppression: 50 dB
Station memory: -

Special Features

Tape Dubbing
Peak display
Mono / Stereo switchable

Carefully insured shipped.


Solid state stereo receiver

Kenwood - KR-710 Solid state stereo receiver

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Good condition - used with small signs of ageing

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Power cord

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+ Extra item (see description)

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Original user manual

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+extra item (see description)

Anti-pop Filter

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Turquoise

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Dieter Rams

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Rodolfo Bonetto

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