Stereo 2 + Quadradial 4 Receiver 4270

Marantz (Sound United LLC); Vista, CA

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  • Year
  • 1973–1977
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 230465

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Superheterodyne (common); ZF/IF 455/10700 kHz
  • Wave bands
  • Broadcast (BC) and FM or UHF.
  • Details
  • Remote Control (with wire or wireless)
  • Power type and voltage
  • Alternating Current supply (AC) / 110; 120; 220; 240 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Power out
  • 140 W (undistorted)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Stereo 2 + Quadradial 4 Receiver 4270 - Marantz Sound United LLC;
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 440 x 137 x 365 mm / 17.3 x 5.4 x 14.4 inch
  • Notes

  • A stereo/quadradial receiver with an AM/FM tuner and integrated amplifier with power output of 2 x 70 watts RMS into 8 ohms or 4 x 25 watts RMS into 8 ohms, housed in a metal case (a wooden case an optional extra). Preamplifier and Power amplifier sections can be separated. With a "Vari-Matrix" circuit which simulates 4 channel sound from 2 channel stereo sound and will reproduce any discrete 4 channel program as well as stereo and mono. Also optional plug-in SQ decoders for any specific matrix system eg: the Marantz SQA-1 SQ Adaptor for the CBS SQ system. PLL FM stereo MPX decoder. Built-in 2 channel Dolby unit. Meters for Signal Strength/Dolby output Level and FM Tuning, gyro-touch tuning wheel, Bass, Mid and Treble rotary tone controls. On the rear, a DIN socket for optional RC-4 wired remote control, terminals for AM and FM antennae, an AM ferrite rod aerial, input sockets for Phono, Tape 1, Tape 2 and CD-4 Aux, a Power Mode switch for 2 x 70 watts stereo or 4 x 25 watts quadrophonic output, 16 terminals for 8 pairs of loudspeakers, (4 Front, 4 Rear), two jacks for Headphones, front and rear, etc.

    Specification  
    FM Section  
    Tuning Frequency Range 88-108MHz
    IHFM Usable Sensitivity 2.3µV
    IHF Selectivity 60dB
    Capture Ratio 1.6dB
    Image Rejection Ratio at 106MHz 70dB
    Signal to Noise Ratio 70dB (Mono), 60dB (Stereo)
    Total Harmonic Distortion 0.2% (Mono), 0.3% (Stereo)
    Frequency Response 30Hz-15kHz ±1dB
    Stereo Separation at 1KHz 40dB
    Quadradial Output (400Hz 75kHz dev.) 300mV
    AM Section  
    Tuning Frequency Range 540-1605kHz
    Usable Sensitivity  30µV
    Selectivity 26dB
    Image Rejection Ratio at 1400kHz  70dB
    Signal to Noise Ratio 45dB
    Frequency Response (-6dB) 50Hz-3.5kHz
    Total Harmonic Distortion 1%
    Audio Section  
    Rated Continuous (RMS) Output
    all channels driven at 40Hz-20kHz
    for Less than 0.3% harmonic distortion    		 25W into 8Ω
    25W into 4Ω
    13W into 16Ω
    Intermodulation distortion Less than 0.3% harmonic distortion
    Input Impedance/Sensitivity  
      Phono
      Line    		 47kΩ/2.2mV for 25W output
    100kΩ/150mV for 25W output
    Frequency Response 20Hz-20kHz ±1.0dB at 1W output
    Damping Factor More than 45 at 8Ω

    Versions/Power requirements
    120V AC 50/60Hz
    220V AC 50Hz
    110/120/220/240V AC 50/60Hz with voltage selector

    Power consumption: 400 watts

    Designed in USA, Produced in Japan

    Dauerleistung 2 x 70 Watt oder (wahlweise) 4 x 25 Watt  (20 - 20.000Hz an 8 Ohm).

  • Net weight (2.2 lb = 1 kg)
  • 18.6 kg / 40 lb 15.5 oz (40.969 lb)
  • Mentioned in
  • -- Original prospect or advert (1976-77 Hauptkatalog and two 1977 Marantz catalogues)
  • Literature/Schematics (1)
  • - - Manufacturers Literature (Service manual Marantz 4270)
  • Literature/Schematics (2)
  • Funk-Technik (FT) (21/1973, S. 798 / Neuvorstellung, Messe Berlin)
  • Literature/Schematics (3)
  • - - Manufacturers Literature (Handbook of Instructions Marantz 4270)
  • Author
  • Model page created by Peter Hoddow. See "Data change" for further contributors.

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The model Stereo 2 + Quadradial 4 Receiver is part of the collections of the following members.

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