Stereophonic Receiver eighteen (18)

Marantz (Sound United LLC); Vista, CA

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  • Year
  • 1968–1972 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 203492

 Technical Specifications

  • Number of Tubes
  • 1
  • Number of Transistors
  • 77
  • Semiconductors
  • Main principle
  • Superhet with RF-stage
  • Wave bands
  • FM Broadcast Band Only
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC) / 120; 240 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Power out
  • 80 W (undistorted)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Stereophonic Receiver eighteen - Marantz Sound United LLC;
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 18.25 x 6 x 16 inch / 464 x 152 x 406 mm
  • Notes

  • The first hi-fi stereo integrated receiver made by Marantz with an FM stereo tuner, preamplifier and power amplifier housed in a single cabinet. Power output of 2 x 40 watts RMS into 4 ohms or 8 ohms, analogue dial. Absolute tuning accuracy through the built-in oscilloscope is an exclusive feature of Marantz tuners. The oscilloscope also indicates correct antenna direction for best reception and tunes out multipath interference, as well as tuning to the maximum signal strength of each station and can also be used to test for optimum stereo separation and stereo phasing of all connected components.

    With Gyro Touch Tuning, rotary controls for oscilloscope Centering, Balance, Volume, Bass and Treble, rotary switches for Selector (Phono, FM, Tape, Aux1, Aux2) and Speaker Systems (Off, Main, Both, Remote), push button switches for Phono2, Mono, Tape Monitor, Audio Display, Hi Blend, Lo Filter, Hi Filter and Muting Off, jacks for headphones and Dubbing.

     On the back, terminals for AM and FM antennae, RCA phono sockets for input Phono (MM), Phono 2 (MM), Tape, Aux1, Aux2, and for output Tape, terminals for two pairs of loudspeakers (Main and Remote), and an unswitched AC outlet. Price in 1968 $695, optional B18-0 oiled walnut cabinet $39.50.

    Specification  
    Audio Section  
    Rated continuous (RMS) power output
    per channel, both channels driven
    20Hz-20,000Hz    		 Into 4Ω:   40 Watts
    Into 8Ω:   40 Watts
    Into 16Ω:  20 Watts
    Dynamic range
    (phono input to tape recording output)     		 98dB Min.
    IM Distortion (SMPTE), at rated power 0.2% Max.
    Total Harmonic Distortion, at rated power 0.2% Max.
    Power Bandwidth (IHF) for 0.2% THD 10Hz-30,000Hz
    Damping Factor (8Ω) 30 Min.
    Frequency Response  
      High-level 20Hz-20,000Hz
      RIAA Phono Equalization    		 ±0.5dB
    ±0.5dB
    Input Sensitivity (for 40W at 8Ω)  
      Line
      Phono (1kHz)    		 100mV
    1mV
    Input Impedance  
      Line
      Phono    		 100kΩ
    47kΩ
    Channel Separation 20Hz-20kHz 35dB Min.
    Stability Unconditional
    FM Section  
    IHF Usable Sensitivity 2.8µV
    Noise Quieting -50dB at 5µV
    -60dB at 10µV
    -70dB at 50µV
    Total Harmonic Distortion, 400Hz, 100% Mod. 0.2% Max.
    Frequency Response ±0.5dB
    Multiplex Separation  1,000Hz 45dB Min.
          20Hz 40dB Min.
    10,000Hz 35dB Min.
    15,000Hz 30dB Min.
    Sub-Carrier (38kHz) Suppression 60dB Min.
    SCA Pilot Carrier (67kHz) Suppression 65dB Min.

    Power Requirements
    120V (105-125V) AC 50/60Hz
    Can be easily converted to 240V

  • Price in first year of sale
  • 695.00 $
  • Mentioned in
  • USA: Audio (Magazine), June 1968, p. 34
  • Literature/Schematics (1)
  • -- Original prospect or advert (1968 The Sound of Marantz catalogue)
  • Literature/Schematics (2)
  • - - Manufacturers Literature (Service manual Marantz eighteen)
  • Literature/Schematics (3)
  • - - Manufacturers Literature (Handbook of Instructions Marantz eighteen)

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