Natural Sound FM Stereo Tuner CT-7000 European model

Yamaha Co.; Hamamatsu

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  • Year
  • 1974–1978
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 149788
    • alternative name: Nippon Gakki

 Technical Specifications

  • Number of Transistors
  • 108
  • Semiconductors
  • Main principle
  • Superheterodyne (common)
  • Wave bands
  • FM Broadcast Band Only
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC) / 110; 117; 130; 220; 240 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Natural Sound FM Stereo Tuner CT-7000 [European model] - Yamaha Co.; Hamamatsu
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 436 x 144 x 352 mm / 17.2 x 5.7 x 13.9 inch
  • Notes

  • A hi-fi FM-Stereo Tuner with an analogue dial housed in an American Walnut wooden case with a hairline brushed aluminium front panel. Dual-gate MOS FET  front end with a 7 gang tuning capacitor, PLL MPX decoder, ceramic block IF filter, low pass filter, auto hi-blend circuit, double FM muting circuit, two meters (signal strength/multipath, tuning), auto touch tuning, AFC station indicator, output level control. With a jack for headphones with volume control, on the back a ground terminal, a connector for a 75 ohm coaxial FM antenna cable, 300 ohm DIN antenna socket, RCA phono sockets for Fixed and Variable Line Output, for Multipath output and IF output.

    Specification  
    Tuning Range 88-108MHz
    Sensitivity (mono) DIN
    (40kHz Dev S/N 26dB)    		 Normal > 1.6µV, Wide > 2.5µV
    Sensitivity (stereo) DIN
    (40kHz Dev S/N 46dB)    		 50µV
    Image Frequency Rejection > 120dB
    IF Rejection > 120dB
    Spurious Response Rejection > 120dB
    AM Rejection IHF > 60dB
    Capture Ratio 1mV: Normal > 1.3dB, Wide > 1.0dB
    10µV: Normal > 2.0dB, Wide > 3.0dB
    100mV: Normal > 1.0dB, Wide > 1.0dB
    Selectivity DIN
    (±300Hz; 40kHz Dev ±500kHz    		 Normal > 65dB, Wide > 10dB
    Normal > 90dB, Wide > 35dB
    Signal/Noise Ratio DIN (mono)
    (40kHz Dev)     		 > 72dB
    Signal/Noise Ratio DIN (stereo)
    (40kHz Dev)    		 > 69dB
    Total Harmonic Distortion DIN
    (antenna level 1mV)    		  
     Mono (1kHz, 40kHz Dev)     
      (50-10,000Hz; 40kHz Dev)      		 Normal < 0.08%, Wide < 0.08%
    Normal < 0.3%, Wide < 0.15%
     Stereo (1kHz; 40kHz Dev)
      (50-10,000Hz; 40kHz Dev)    		 Normal < 0.08%, Wide < 0.08%
    Normal < 0.5%, Wide < 0.2%
    Stereo Separation DIN  
     (1kHz; 40kHz Dev)
     (50-10,000Hz; 40kHz Dev)    		 Normal & wide 50dB
    Normal 35dB, Wide 40dB
    Frequency Response 50-10,000Hz ±0.3dB
    30-15,000Hz +0.5dB,-1.0dB
    Headphone Output 4.16Ω
    Fixed Output 775mV
    Variable Output 2V-70mV variable
    Antenna Input Impedance 300Ω (balanced), 75Ω (unbalanced)

    Semiconductors: Transistors 108, FETs 12, Diodes 33, Zener Diodes 9, ICs 7
    Power requirements: 110, 117, 130, 220, 240V AC 50/60Hz  with voltage selector
    Power Consumption: 23 watts (illum. off: 13 watts)

    Very similar to the Yamaha CT-7000 FM Stereo Tuner US and Canada version.

  • Net weight (2.2 lb = 1 kg)
  • 13 kg / 28 lb 10.1 oz (28.634 lb)
  • Price in first year of sale
  • 1,200.00 $
  • Source of data
  • -- Collector info (Sammler)
  • Mentioned in
  • -- Original prospect or advert (1978 Yamaha Natural Sound catalogue)
  • Literature/Schematics (1)
  • -- Schematic
  • Literature/Schematics (2)
  • - - Manufacturers Literature (Service manual Yamaha CT-7000 dated 10-74)
  • Literature/Schematics (3)
  • -- Original prospect or advert (Yamaha CT-7000 brochure)
  • Author
  • Model page created by Franz Scharner. See "Data change" for further contributors.

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