Please click your language flag. Bitte Sprachflagge klicken.

Audio Current Transfer FM Stereo/FM-AM Tuner ST-S444ES US, Canada and E models

Country:  Japan
Manufacturer / Brand:  Sony Corporation; Tokyo
Year: 1984/1985 Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors (the count is only for transistors) Semiconductors present.
Main principle PLL, Phase-locked loop; ZF/IF 450/10700 kHz
Wave bands - without
Details Hi-Fi equipment
Power type and voltage Alternating Current supply (AC) / 120; 220; 240 Volt
Loudspeaker - For headphones or amp.
Power out
from Model: Audio Current Transfer FM Stereo/FM-AM Tuner ST-S444ES [US, Canada and E models] - Sony Corporation; Tokyo
Material Metal case
Shape Book-shelf unit.
Dimensions (WHD) 430 x 80 x 340 mm / 16.9 x 3.1 x 13.4 inch

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 for 8 AM or FM radio stations, SCAN/READ function, a Program Function with optional timer, Hi-Blend switch, a 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).

SystemPLL quartz-locked digital synthesizer system
FM stereo, FM/AM super-heterodyne tuner
FM tuner section 
Tuning range87.5MHz - 108MHz
Antenna terminals75Ω unbalanced
Sensitivity at 50dB quieting16.8dBf, 1.8µV (mono) ; 37.9dBf, 22.5µV (stereo)
Usable sensitivity10.3dBf, 0.9µV (IHF)
Signal/Noise ratio91dB (mono), 88dB (stereo)
Frequency response30Hz - 15kHz +0.2dB,-0.5dB
Selectivity at 400kHz60dB (WIDE), 90dB (NARROW)
Harmonic distortion at 1kHzMono:   0.03% (WIDE), 0.05% (NARROW)
Stereo: 0.04% (WIDE), 0.06% (NARROW)
IM distortionMono:   0.03% (WIDE), 0.05% (NARROW)
Stereo: 0.04% (WIDE), 0.06% (NARROW)
Separation at 1kHz60dB
Capture ratio1.0dB
AM suppression ratio65dB
Image response ratio120dB
IF response ratio120dB
Spurious response ratio120dB
Muting thresholdApprox. 29dBf, 8µV
Auto tuning thresholdApprox. 29dBf, 8µV
Output level/impedance
at 75kHz deviation

Calibration tone400Hz, 50% mod
AM tuner section 
Tuning range531 - 1,602kHz (9kHz steps)
530 - 1,610kHz (10kHz steps)
AntennaLayout-Free AM antenna
External antenna terminal
Usable sensitivity
at 999 or 1,000kHz
Layout-Free AM antenna 300µV/m
External antenna 30µV
Harmonic distortion0.3%
Selectivity35dB (9kHz), 38dB (10kHz)
Image response ratio42dB (at 999 or 1,000kHz)
Auto-tuning thresholdApprox. 1mV/m

Versions/Power requirements
US, Canadian model  / 120V AC 60Hz
E model  / 120, 220 or 240V AC 50/60Hz with voltage selector

Power consumption 18 watts

See also the similar Sony ST-S444ES Audio Current Transfer FM Stereo/FM-AM Tuner AEP and UK model.

Net weight (2.2 lb = 1 kg) 4.4 kg / 9 lb 11.1 oz (9.692 lb)
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 ST-S444ES dated 1984)

Model page created by Howard Craven. See "Data change" for further contributors.

All listed radios etc. from Sony Corporation; Tokyo
Here you find 3542 models, 3398 with images and 753 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.