• Country
• Japan

• Manufacturer / Brand
• Sony Corporation; Tokyo

• Year
• 1976–1978

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 111287

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

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Superheterodyne (common); ZF/IF 468/10700 kHz

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

• Details
• Hi-Fi equipment

• Power type and voltage
• Alternating Current supply (AC) / 110; 127; 220; 240 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Various materials

• from Radiomuseum.org
• Model: FM Stereo / FM-AM Tuner ST-3950 - Sony Corporation; Tokyo

• Shape
• Book-shelf unit.

• Dimensions (WHD)
• 460 x 170 x 335 mm / 18.1 x 6.7 x 13.2 inch

• Notes

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

  Specifications
  FM Section
  Tuning Range	87.5 - 108MHz
  Antenna Terminals	300Ω balanced, 75Ω coaxial cable input
  Usable Sensitivity	1.7µV (MONO), IHF 1.5µV, S/N = 26dB (40kHz deviation)
  Sensitivity at 50dB Quieting	3.0µV (MONO) 40µV (STEREO)
  Sensitivity at 46dB Quieting     (40kHz deviation)	40µV (STEREO)
  Image Rejection	80dB
  IF Rejection	100dB
  Spurious Rejection	90dB
  AM Suppression	56dB
  Capture Ratio	1.0dB
  Selectivity	80dB
  S/N Ratio	75dB (MONO), 70dB (STEREO)
  Harmonic Distortion at 100Hz, 1kHz	0.15% (MONO), 0.25% (STEREO)
  Stereo Separation	35dB at 100Hz
  Frequency Response	40Hz - 12.5kHz +0.3dB,-0.8dB
  Muting Level	Approx. 5µV
  AM Section
  Tuning Range	530 - 1,605kHz
  Antenna	Built-in ferrite-rod antenna and external antenna terminal
  Usable Sensitivity	250µV/m built-in antenna 100µV external antenna at 1,000kHz
  Image Rejection	40dB at 1,000kHz
  S/N Ratio	50dB at 50mV/m
  Harmonic Distortion	0.5% at 50mV/m, 400Hz
  Outputs	FIXED:         750mV, 10kΩ VARIABLE:  0 - 1.5V, 1.5kΩ FM DISCRI: 150mV, 2.5 kΩ

  Versions/Power Requirements
  UK, AEP / 110, 127, 220 or 240V AC 50/60Hz with voltage selector
                                   
  Power Consumption: 29W (UK model), 27W (AEP model)

  Seitliche Holzblenden abnehmbar.

• Net weight (2.2 lb = 1 kg)
• 8 kg / 17 lb 9.9 oz (17.621 lb)

• Price in first year of sale
• 69,800.00 JPY

• Source of data
• - - Data from my own collection

• Mentioned in
• -- Original prospect or advert (1976 Sony hi-fi and 1978 Das Sony-Gesamtprogramm catalogues)

• Literature/Schematics (1)
• - - Manufacturers Literature (Sony ST-3950 Owner's instruction manual)

• Literature/Schematics (2)
• - - Manufacturers Literature (Service manual Sony ST-3950)

• Author
• Model page created by Peter Böhm. 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