Kenwood KR-7070

Data

General

  • Manufacturer: Kenwood
  • Model: KR-7070
  • Year of manufacture: 1970 - 1971
  • Made in: Japan
  • Color: Silver, black, walnut wood cabinet
  • Remote control: RC-70 wired remote control included
  • Power consumption: 320 W at full output / 40 W without signal
  • Dimensions: 432 x 165 x 370 mm
  • Weight: 18 kg
  • Original price approx.: 150'000 Yen (Japan, 1971), 2'500 DM


Connections

  • Number of inputs:
    • Phono 1: 2.5 mV / 50 kOhm, switchable 0.05 mV / 200 Ohm, 0.5 mV / 200 Ohm.
    • Phono 2: 2.5 mV / 50 kOhm
    • Microphone: 4 mV / 100 kOhm
    • Aux: 180 mV / 100 kOhm
    • Tape Play:
      • Cinch: 100 mV / 100 kOhm
      • DIN:
    • Main In: 100 mV / 100 kOhm
    • Antenna: FM (75 Ohm Unbalanced / 300 Ohm Balanced), AM.
  • Number of outputs:
    • Tape Rec (Cinch / DIN): 200 mV / 40 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: 1.6µV
    • MW: 15µV

Distortion factor:

    • Mono: < 0.4

Stereo: < 0,6 %

  • Signalrauschabstand:
    • UKW: >70 dB
    • MW: > 50 dB
  • Common mode selection: 1.5 dB
  • Channel separation (1 kHz / 10 kHz): > 35 dB / > 25 dB
  • selectivity:
    • FM: > 75 dB

MW: > 25 dB

  • Co-wave selection: > 100 dB
  • Spurious wave selection: > 55 dB
  • Mirror frequency attenuation:
    • FM: > 100 dB
    • MW: > 70 dB

IF attenuation:

    • FM: > 100 dB

MW: > 70 dB

  • AM suppression:


Technical Data Amplifier Part

  • Continuous power (at distortion factor)
    • 8 Ohm: 2 x 90 W
    • 4 Ohm: 2 x 110 W
    • mono output: 5 W
  • Dynamic power
    • 8 Ohm: 220 W (IHF)
    • 4 Ohm: 300 W (IHF)
  • Total harmonic distortion: 0.1 % at full scale
  • Attenuation factor: 50 at 8 Ohm, 100 at 4 Ohm
  • Frequency response: 20 - 40000 Hz ± 1.5dB
  • Power bandwidth(IHF): 10 - 30000 Hz
  • Signal to noise ratio:
    • Phono 1/2: 65 dB
    • Microphone: 67 dB
    • Aux/Tape Play: 75 dB
  • Tone control:
    • Bass: ± 10 dB at 100 Hz

Treble: ± 10 dB at 10 kHz

  • Loudness: 2-stage

Mid: + 6 dB / 100 Hz

    • Max: + 10 dB / 100 Hz, + 5 dB / 10 kHz
  • Low Filter: -7 dB at 100 Hz
  • High Filter: -10 dB at 10 kHz
  • Presence: 2-stage:
    • + 6 dB at 400 Hz

+ 6 dB at 1 kHz

  • Audio Muting: - 20 dB


Special Features

  • Cable remote control RC-70 for car tuning
  • Presence switch
  • Separable pre- and power amplifier
  • Microphone / Phono switch
  • 2 microphone inputs
    • Kenwood original microphone MC-501 optionally available
  • FM center display instrument
  • FM Muting
  • Note: in some countries the unit was originally supplied with metal cover. The walnut wood case was available as an option under the designation SR-77 for example in the USA for 24.95 US-$.


Remarks



Pictures

  • Kenwood KR-7070

KR-7070-14.jpg


  • Kenwood KR-7070 front description

KR-7070-Prospekt-5.jpg


  • Kenwood KR-7070 Rear Description

KR-7070-Prospekt-6.jpg


Reports

  • External review on website "Mackern": [[1]]


Links

  • External link: Audio Heritage Japan website: [2]</0,6>