FM Stereo / FM-AM Tuner ST-20F - ST-20FB

Sony Corporation; Tokyo

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  • Year
  • 1979–1981
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 221937

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • PLL, Phase-locked loop; ZF/IF 459/10700 kHz
  • Wave bands
  • Broadcast (BC) and FM or UHF.
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC) / 120; 220; 240 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: FM Stereo / FM-AM Tuner ST-20F - ST-20FB - Sony Corporation; Tokyo
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 430 x 70 x 170 mm / 16.9 x 2.8 x 6.7 inch
  • Notes

  • A hi-fi PLL Quartz Synthesizer AM/FM stereo tuner with a digital display, a component in the Sony Falcon Hi-Fi systems. The Sony ST-20F (US, AEP, E models) is housed in a silver metal case, the ST-20FB (Canadian, AEP models) in a black metal case. Memory (with backup battery) for 12 preset radio stations, automatic tuning, variable speed tuning (Fast, Slow, Single Step). With terminals for AM and FM antennae, line output cable fitted with phono plugs and a selector switch for AM frequency increment, 9kHz or 10kHz steps.

    Specification  
    FM Section  
    Frequency Range  
      US, Canadian model
      E, AEP model    		 87.5 - 108MHz
    87.55 - 108MHz
    Antenna Terminals 300Ω balanced, 75Ω unbalanced
    Sensitivity at 50dB Quieting
     (75kHz deviation)    		 3.5µV, 16.1dBf (MONO)
    45µV, 38.3dBf (STEREO)
    Usable Sensitivity IHF 1.8µV, 10.3dBf
    DIN 1.3µV (S/N = 26dB, 40kHz deviation)
    S/N Ratio 75dB (MONO), 70dB (STEREO)
    Harmonic Distortion 0.1% (MONO) at 1kHz, 0.25% (STEREO) at 1kHz
    IM Distortion 0.1% (MONO), 0.25% (STEREO)
    Separation   45dB at 1kHz
    Frequency Response IHF 30Hz - 15kHz +0.5dB,-2.0dB
    DIN 40Hz - 12.5kHz +0.5dB,-1.0dB
    Alternate Channel Selectivity IHF 60dB (400kHz), DIN 55dB (300kHz)
    Capture Ratio  1.0dB
    AM Suppression Ratio 54dB
    Image Response Ratio 85dB
    Muting Threshold Approx. 5µV
    Output Level  
      AEP model
      US, Canadian, E model    		 450mV, 4.7kΩ (1kHz, 40kHz deviation)
    450mV, 4.7kΩ (1kHz, 75kHz deviation)
    AM Section  
    Frequency Range  
      AEP model 531 - 1,602kHz
      US, Canadian, E model 525 - 1,605kHz (10kHz steps)
    531 - 1,602kHz (9kHz steps)
    Antennas External antenna terminal
    Attached antenna wire
    Usable Sensitivity 100µV (1,000kHz)
    S/N Ratio 52dB (5mV)
    Harmonic Distortion 0.3% (5mV, 400Hz)
    Selectivity 50dB (9kHz)
    Image Response Ratio 40dB (1,000kHz)

    Versions/Power requirements
    ST-20F US model / 120V AC 60Hz
    ST-20FB Canadian model / 120V AC 60Hz
    ST-20F or ST-20FB AEP models  / 220V AC 50Hz
    ST-20F E model / AC 120, 220, 240V AC 50/60Hz with votage selector

    Power consumption:  12 Watts

  • Net weight (2.2 lb = 1 kg)
  • 2.9 kg / 6 lb 6.2 oz (6.388 lb)
  • Mentioned in
  • -- Original-techn. papers. (October 1979, No.1)
  • Literature/Schematics (1)
  • - - Manufacturers Literature (Service manual ST-20F ST-20-FB dated 1979)
  • Literature/Schematics (2)
  • -- Original prospect or advert (1981 Sony Audio catalogue)
  • Author
  • Model page created by a member from A. See "Data change" for further contributors.

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