• Country
• Japan

• Manufacturer / Brand
• Sony Corporation; Tokyo

• Year
• 1975/1976

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 230542

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

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Superhet with RF-stage; ZF/IF 455 or 468/10700 kHz

• Wave bands
• Broadcast (BC) and FM or UHF.

• Details
• Hi-Fi equipment

• Power type and voltage
• Alternating Current supply (AC) / 100; 110; 117; 120; 220; 240 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: FM Stereo / FM-AM Tuner ST-4950 - Sony Corporation; Tokyo

• Shape
• Book-shelf unit.

• Dimensions (WHD)
• 460 x 168 x 331 mm / 18.1 x 6.6 x 13 inch

• Notes

• A hi-fi AM/FM stereo tuner with an analogue dial, housed in a wooden case, or in a metal case (USA). With meters for Signal strength and Tuning, Stereo indicator lamp, rotary Tuning control, rotary Function switch (AM, FM Mono, FM Stereo), push button switches for Muting, Multipath, Hi Blend and AFC. On the back, an AM ferrite rod antenna, terminals for AM and FM antennae, RCA phono sockets fot Fixed Line Output and for Variable Line Output (with output level adjusters) and for FM Discriminator output.  

  Specification
  FM Section
  Tuning range	87.5 - 108MHz
  Intermediate frequency	10.7MHz
  Antenna terminals	300Ω balanced, 75Ω unbalanced
  Sensitivity	1.9µV (5.5dB), IHF 1.5µV (3.5dB), S/N 26dB  (1kHz, 40kHz deviation)
  Image rejection	70dB
  IF rejection	100dB
  Spurious rejection	100dB
  AM suppression	56dB
  Capture ratio	1.0dB
  Selectivity	80dB, IHF
  S/N ratio	70dB
  Frequency response	20 - 15,000Hz ±1dB
  Harmonic distortion	Mono 0.15%, Stereo 0.3% at 400Hz,  100% (75kHz deviation) modulation
  Stereo separation	> 40dB at 400Hz and 1kHz
  Muting level	< 5µV
  AM Section
  Tuning range	530 - 1,605kHz
  Intermediate frequency	455 kHz (USA, PX Model) 468 kHz (UK, AEP Model)
  Antenna	Built-in antenna and external antenna terminal
  Sensitivity	250µV/m (48dB/m), built in antenna 100µV/m (40dB/m), external antenna
  Image rejection	45dB at 1,000kHz
  S/N ratio	50dB
  Harmonic distortion	0.5%
  Output Section
  Voltage/Impedance	FIXED: 750mV / 10kΩ VARIABLE: 0 - 2V / 3kΩ FM DISCRI: 150mV / 2.2kΩ

  Versions/Power requirements
  USA Model        /  120V AC 60Hz
  UK, AEP Model  /  110, 117, 220 or 240V AC 50/60Hz with voltage selector
  PX Model           /  100, 120, 220 or 240V AC 50/60Hz with voltage selector

  Power consumption: 22W (USA Model), 25W (UK, AEP, PX Model)

  Dimensions, Weight
  USA Model                /  430(w) x 168(h) x 331(d) mm, weight 7.7 kg
  UK, AEP, PA Models  /  460(w) x 168(h) x 331(d) mm, weight 8.6 kg

• Net weight (2.2 lb = 1 kg)
• 8.6 kg / 18 lb 15.1 oz (18.943 lb)

• Price in first year of sale
• 1,990.00 FRF

• Mentioned in
• -- Original prospect or advert (1975-76 Sony HiFi-Stereo-/Quadro-Gerate katalog)

• Literature/Schematics (1)
• - - Manufacturers Literature (Service manual ST-4950 dated 1975)

• Author
• Model page created by Gottfried Silberhorn. See "Data change" for further contributors.

• Other Models

• Here you find 3913 models, 3773 with images and 947 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sony Corporation; Tokyo