Audio Current Transfer FM Stereo/FM-AM Tuner ST-S444ES AEP and UK models

Sony Corporation; Tokyo

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  • Year
  • 1984/1985
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 225249

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • PLL, Phase-locked loop; ZF/IF 450/10700 kHz
  • Wave bands
  • Broadcast (BC) and FM or UHF.
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC) / 220; 240 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Audio Current Transfer FM Stereo/FM-AM Tuner ST-S444ES [AEP and UK models] - Sony Corporation; Tokyo
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 430 x 80 x 340 mm / 16.9 x 3.1 x 13.4 inch
  • Notes

  • A hi-fi AM/FM stereo quartz lock digital synthesizer tuner with a digital frequency display. Features Direct Comparator Technology and an Audio Current Transfer (ACT) circuit. With Automatic tuning, Manual tuning, Memory preset tuning (8 AM or FM radio stations), the SCAN/READ button which scans through all the preset radio stations playing each one for 10 seconds, a Program Function which automatically tunes in to up to four stations which have been memorized in any sequence which will be received one by one as the power is turned on and off by an optional timer, a Hi-Blend switch, 10 step Signal Strength indicator and a Calibration Tone button which produces a 400Hz, 50% mod. signal for calibrating the recording level on a tape deck. AM and FM antennae terminals and an ACT output connector (a special ACT cable is supplied for connecting the tuner to an amplifier).

    Specification  
    FM tuner section  
    Tuning range 87.5MHz-108MHz
    Antenna terminals 75Ω unbalanced
    Sensitivity at 46dB quieting 17.3dBf, 2µV (mono), 37.9dBf, 22.5µV (stereo)
    Usable sensitivity 10.3dBf, 0.9µV (IHF)
    0.8µV (S/N = 26dB)
    Signal/Noise ratio 85dB (mono), 82dB (stereo)
    Frequency response 40Hz-12.5kHz ±0.2dB
    30Hz-15kHz +0.2dB,-0.5dB
    Selectivity at 300kHz 30dB (WIDE), 57dB (NARROW)
    Harmonic distortion at 1kHz Mono: 0.03% (WIDE), 0.05% (NARROW)
    Stereo: 0.04% (WIDE), 0.06% (NARROW)
    IM distortion Mono: 0.03% (WIDE), 0.05% (NARROW)
    Stereo: 0.04% (WIDE), 0.06% (NARROW)
    Separation at 1kHz 60dB
    Capture ratio 1.0dB
    AM suppression ratio 65dB
    Image response ratio 120dB
    IF response ratio 120dB
    Spurious response ratio 120dB
    Muting threshold Approx 29dBf, 8µV
    Auto tuning threshold Approx 29dBf, 8µV
    Output level/impedance
    at 75kHz deviation    		 750mV/620Ω
    Calibration tone 400Hz, 50% mod
    AM tuner section  
    Tuning range 531-1,602kHz
    Antenna Layout-Free AM antenna, External antenna terminal
    Usable sensitivity
    at 999 or 1,000kHz    		 Layout-Free AM antenna 300µV/m
    External antenna 30µV
    Signal/Noise-ratio 54dB
    Harmonic distortion 0.3%
    Selectivity 35dB
    Image response ratio 42dB (at 999 or 1,000kHz)
    Auto-tuning threshold Approx. 1mV/m

    Versions/Power requirements
    AEP model / 220V AC 50/60Hz (or 240V AC internally adjustable)
    UK model / 240V AC 50/60Hz (or 220V AC internally adjustable)

    Power consumption 18 watts

    See also the Sony ST-S444ES US, Canada and E models.

  • Net weight (2.2 lb = 1 kg)
  • 4.4 kg / 9 lb 11.1 oz (9.692 lb)
  • Source of data
  • -- Original prospect or advert
  • Mentioned in
  • -- Original prospect or advert (1984 Sony Audio catalogue)
  • Literature/Schematics (1)
  • -- Original prospect or advert (1985 Sony HiFi-Systemkomponenten katalog)
  • Literature/Schematics (2)
  • - - Manufacturers Literature (Service manual Sony ST-S444ES dated 1984)

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