AM/FM Stereo Tuner ST-7

Nakamichi Co.; Tokyo

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  • Year
  • 1987–1989
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 327183

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • PLL, Phase-locked loop
  • Wave bands
  • Broadcast (BC) and FM or UHF.
  • Details
  • Remote Control (with wire or wireless)
  • Power type and voltage
  • Alternating Current supply (AC) / 120; 220; 240 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: AM/FM Stereo Tuner ST-7 - Nakamichi Co.; Tokyo
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 435 x 63 x 289 mm / 17.1 x 2.5 x 11.4 inch
  • Notes

  • A hi-fi AM/FM stereo synthesizer tuner with a digital frequency display housed in a black metallic case. Provision for system wired remote control. With Schotz NR circuit, Memory for 16 FM and MW stations, switches for FM Mute and Mode (mono/stereo). AM loop antenna, terminals for FM and AM antennae, connection for System Remote control, RCA phono Line Output sockets with output level adjusters.

    Specification  
    FM Section De-emph. 75µs, IF Band Wide, 300Ω antenna
    Frequency Range 87.5-108.0MHz 100kHz steps
    IHF Usable Sensitivity Mono 10dBf/1.7µV, Stereo 17dBf/3.9µV
    50dB Quieting Sensitivity  
     Mono
     Stereo with Schotz NR    		 14dBf/2.7µV
    28dBf/14µV, without Schotz NR 37dBf/39µV
    S/N Ratio  
     Mono
     Stereo    		 > 80dB (USA, Canada), > 79dB (Other)
    > 76dB (USA, Canada), > 75dB (Other)
    Schotz NR Improvement > 6dB
    Schotz NR Active Level 19-53dBf/2.5-250µV
    Hi-Blend Threshold Level 19dBf/5µV
    Muting Threshold Level 20dBf/5.5µV
    Frequency Response 20-15,000Hz ±1dB
    THD (1kHz)  Mono < 0.06%, Stereo < 0.08%
    Capture Ratio  1.9dB
    Alt. Channel Selectivity (±400kHz) > 60dB (USA, Canada), > 70dB (Other)
    Stereo Separation
      100Hz/1kHz/10kHz    		 50/55/45dB (USA, Canada)
    45/50/35dB (Other)
    Spurious Response Rejection > 100dB
    Image Rejection > 100dB
    IF Rejection > 100dB
    AM Suppression > 60dB
    AM Section Modulation: 400Hz, 30%
    Frequency Range 520-1,710kHz 10kHz steps
    Usable Sensitivity 50dBµ/m
    S/N Ratio (RF input 90dBµ/m) > 48dB
    THD (RF Input 90dBµ/m) < 0.4%
    Selectivity (±10kHz) > 20dB
    Output Level/Impedance  
     FM (1kHz, Mono, 100% Mod.)
     AM (400Hz, 30% Mod.)    		 0.5-2.0V (variable)/1.5kΩ
    0.2-0.9V (variable)/1.6kΩ
    FM Antenna Inputs 75Ω unbalanced, 300Ω balanced

    Versions/Power Requirements
    USA, Canada  /  120V 50/60Hz
    Others  /  120, 220 or 240V AC 50/60Hz (According to country of sale)
    Power Consumption: 15 W max. (USA, Canada), 16 W max. (Other)

    Very similar to the Nakamichi ST-7E AM/FM Stereo Tuner and the Nakamichi ST-70 AM/FM Stereo Tuner (Japan model).

  • Net weight (2.2 lb = 1 kg)
  • 4.7 kg / 10 lb 5.6 oz (10.352 lb)
  • Mentioned in
  • -- Original prospect or advert (1987 and 1989 Nakamichi catalogues)
  • Literature/Schematics (1)
  • - - Manufacturers Literature (Service manual ST-7 ST-7E / ST-70)
  • Literature/Schematics (2)
  • - - Manufacturers Literature (Owner's manual ST-7/ST-7E)
  • Author
  • Model page created by Howard Craven. See "Data change" for further contributors.

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