Kenwood KR-710 receiver

 

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)

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)