Kenwood KR-4140

Data

General

• Manufacturer: Kenwood
• Model: KR-4140
• Year of manufacture: 1970 - 1972
• Made in: Japan
• Color: Silver, Black, Walnut wood cabinet
• Remote control: No
• Power consumption: 120 W at full output / 20 W without signal
• Dimensions: 425 x 140 x 315 mm
• Weight: 9 kg
• Original price approx.: 300 US-$, 1'100 DM

Connections

• Number of inputs:
  • Phono 1/2: 2.5 mV / 50 kOhm

MIC: 1.8 mV / 100 kOhm

• • Aux / Tape Play: 150 mV / 100 kOhm
  • Main In: 100 mV / 100 kOhm
  • Antenna: FM (75 Ohm Unbalanced / 300 Ohm Balanced), AM.
• Number of outputs:
  • Tape Rec (RCA / DIN): 150 mV / 30 mV.
  • Pre-Out:
  • Headphones
  • 2 pairs of speakers

Technical Data Tuner Part

• Reception: FM, MW
• Frequencies:
  • FM: 88 - 108 MHz

MW: 520 - 1610 kHz

• Frequency response: 20 - 15,000 Hz (± 1.2 dB, FM)
• Input sensitivity:
  • FM: 1.8µV
  • MW: 15µV

Distortion factor:

• • Mono: 0.5 %

Stereo: 0.8

• Signal to noise ratio: 65 dB
• Common mode selection: 2.5 dB
• Channel separation (1 kHz): 35 dB
• Selectivity:
  • FM: 65 dB

MW: 25 dB

• Co-wave selection: 70 dB
• Spurious wave selection: 40 dB
• IF attenuation: 70 dB
• IF attenuation:
• AM suppression:

Amplifier Part Specifications

• Continuous power (at distortion)
  • 8 Ohm: 2 x 24 W
  • 4 Ohm: 2 x 33 W
• Dynamic power
  • 8 Ohm: 80 W (IHF)
  • 4 Ohm: 95 W (IHF)
• Total harmonic distortion: 0.5 % at full modulation
• Attenuation factor: 50 at 8 Ohm
• Frequency response: 20 - 40000 Hz ± 1.5dB
• Power bandwidth(IHF): 17 - 30000 Hz
• Signal to noise ratio:
  • Phono 1/2: 65 dB
  • Microphone: 58 dB
  • Aux/Tape Play: 75 dB
• Tone control:
  • Bass: ± 10 dB at 100 Hz

Treble: ± 10 dB at 10 kHz

• Loudness: + 10 dB / 100 Hz, + 5 dB / 10 kHz
• Low Filter : -7 dB at 100 Hz
• High Filter: -10 dB at 10 kHz

Special Features

• Separable pre- and power amplifier
• Separate mono output
• Microphone inputs L + R
  • Kenwood original microphone MC-501 optionally available
• FM muting
• Note: in some countries the unit was originally supplied with metal cover. The walnut wood case was available under the designation SR-66 for example in the USA optionally for 19.95 US-$.

Remarks

• Other models of the same series:
  • Kenwood KR-2120
  • Kenwood KR-3130
  • Kenwood KR-4140
  • Kenwood KR-5150
  • Kenwood KR-6160
  • Kenwood KR-7070
  • Kenwood KR-7070 A

Pictures

• Kenwood KR-4140

• Option: Kenwood original microphone MC-501

Reports

• External report from "Good Old Hifi": [[1]]

• External repair report from "Old Fidelity": [[2]]