Kenwood KR-4070 Instruction Manual

POINTS TO BE
CHECKED PRIOR TO SERVICING
Occurs Only During AM Reception
| Correction
Continuous low frequency buzz.
Most noticeable at night on weak signal
stations.
Continuous high frequency whine increases
at night.
i Erecting a 10-meter outdoor antenna and securing good ground conditions should reduce
| interference considerably. Complete elimination is difficult.
Turn TV off.
receiver side
(Neighboring TV set may also be cause.) Impossible to eliminate from
Occurs Only During FM Reception
Correction
Continuous hiss or buzzing interference
with broadcast.
Becomes louder during stereo.
Erect outdoor FM antenna if only indoor T-type is used. An antenna with more than 5
elements is necessary if you are located at a considerable distance from the transmitting
station.
During AM, FM or Turntable
Correction
No sound from LEFT and RIGHT.
Sound only from one side.
Check connections from receiver output to speakers.
Set to appropriate volume level
Always set to SOURCE except when using tape decks.
Check receiver output and speakers connections.
During Record Playback Only
Correction
No sound from LEFT and RIGHT, or sound
only from one side.
Sound audible but background hum occurs.
Howling noise occurs when volume is
raised or bass response is increased.
See that turntable output cord is firmly plugged into receiver input.
Keep turntable output cord away from AC cords. Choose cord paths which keep hum ata
minimum. Twist LEFT-RIGHT turntable output cords together. Reverse turntable AC plug
connections. Connect turntable groundwire to GND terminal.
Increase distance between turntable and speakers. Choose speaker locations carefully.
Remember, loose flooring induces howling.
AMPLIFIER SECTION
SPECIFICATIONS
Signal to Noise Ratio at 65 dBt:
Power
Output
{Mono}:
72
0B
.
(Stereo):
67
dB
40
watts*
per
channel,
minimum
RMS
at
8
T.H.
Distortion
at
65
dBf:
ohms, from 20 Hz to 20,000 Hz with no more mone) Ooese
than 0.1% total harmonic distortion Frequency Response: 20 to 15.000 Hz + 0.5 dB. —2.0 dB
Capture Ratio: 1.0dB
Both Channels Driven: 40 + 40 watts 8 ohms at 1.000 Hz Alternate Channel Selectivity: 60 d8
47 + 47 watts 4 ohms at 1,000 Hz Spurious Response Ratio: 75 dB
Dynamic Power Output: 190 watts 4 ohms Image Response Ratio: 45dB
Total Harmonic Distortion:: 0.1% at rated power into 8 ohms IF Response Ratio (Balanced): 95 dB
0.05% at 1 watt into 8 ohms AM Suppression Ratio: 53 dB
43 GB at 1.000 Hz .
35 dB at 50 to 10,000 Hz
40 dB
300 ohms balanced and 75 ohms unbalanced
88 MHz to 108 MHz
Intermodulation Distortion:
(60 Hz: 7 kHz = 4:1)
Power Bandwidth:
Damping Factor: 40 at 8 ohms
Speaker Impedance: Accept 4 ohms to 16 ohms
vity/Impedance/Signal to Noise Ratio (IHF A Curve):
2.5 mV/50k ohms/73 dB
0.1% at rated power into 8 ohms
0.05% at 1 watt into 8 ohms
10 Hz to 40,000 Hz
Stereo Separation:
Sub Carrier Product Ratio:
Antenna Impedance:
FM Frequency Range:
AM TUNER SECTION
150 mV/45k ohms/95 dB Usable Sensitivity: 16 Vv
Tape: 150 mV/45k ohms/95 dB Signal to Noise Ratio: 50 dB
Maximum Input Level for image Rejection: 50 dB
Phono: 190 mV (rms), T.H.0. 0.1% at 1.000 Hz Selectivity: 34 oB
Output Level/Impedance:
Tape REC (Pin): 150 mV/100 ohms GENERAL — '
{DIN): 30 mV/80k ohms Power Consumption: 300 watts at full power
Frequency Response: A.C, Outlet: Switched 1, Unswitched 1
Phono: RIAA standard curve +0.3 4B. -0.3d8 Dimensions: Wo Be eg)
AUX and Tape: 15 Hz to 70,000 Hz +0 dB, — 1.0 dB D 14-3716" (360 mm}
Tone Control: 48dB at 100 Hz Weight (Net): 20.7 Ib (9.4-kg)
Treble: +8 dB at 10,000 Hz
Loudness Control (—30dB): +9 d8 at 100 Hz
+5 dB at 10,000 Hz
FM TUNER SECTION (IHF)
Usable Sensitivity: 10.8 dBt (1.9 nV) Note:
50 dB Quieting Sensitivity: . .
(Mono):
15
dBf
(3.1
pV)
Kenwood
follows
a
policy
of
continuous
advancements
in
development.
(Stereo): 37.2 dBf (40 pV) For this reason, specifications may be changed without notice.
*Measured pursuant to Federal Trade Commission's Trade Regulation rule
on Power Output Claims for Amplifier in U.S.A PRINTED IN JAPAN’ B50-1630-00 (KUMXWL) (G)
N/i49 D12946/847 67890N/848 D12345/949 6789ON/950 D12345/051

Kenwood KR-4070 Specifications

Amplifier Section

signal to noise ratio at 65 dBf	67 dB
power output (mono)	72 dB
power output (stereo)	40 watts per channel, minimum RMS at 8 ohms, from 20 Hz to 20, 000 Hz with no more than 0.1% total harmonic distortion
frequency response	20 to 15, 000 Hz +0.5 dB, -2.0 dB
capture ratio	1.0 dB
both channels driven	40 + 40 watts 8 ohms at 1, 000 Hz
dynamic power output	190 watts 4 ohms
total harmonic distortion	0.1% at rated power into 8 ohms
intermodulation distortion	0.1% at rated power into 8 ohms
power bandwidth	10 Hz to 40, 000 Hz
damping factor	40 at 8 ohms
stereo separation	43 dB at 1, 000 Hz

General

power consumption	300 watts at full power
dimensions	360 mm
weight	20.7 lb (9.4 kg)

FM Tuner Section

usable sensitivity	10.8 dBf (1.9 nV)
50 dB quieting sensitivity (mono)	15 dBf (3.1 µV)
50 dB quieting sensitivity (stereo)	37.2 dBf (40 µV)

AM Tuner Section

usable sensitivity	16 µV
signal to noise ratio	50 dB
selectivity	34 dB