• Country
• Japan

• Manufacturer / Brand
• Sony Corporation; Tokyo

• Year
• 1958

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 103211

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

• Number of Transistors
• 7

• Semiconductors
• 2T7 2T7 2T7 2T6 2T6 2T8 or. 2T6 or. 2SB52 2T8 or. 2T6 or. 2SB52 1T23 1T51

• Main principle
• Superheterodyne (common); ZF/IF 455 kHz; 3 AF stage(s)

• Tuned circuits
• 5 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / 3 × 1,5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 12 inch = 30.5 cm

• Power out
• 0.12 W (0.2 W max.)

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: TR-712 - Sony Corporation; Tokyo

• Shape
• Portable set > 8 inch (also usable without mains)

• Dimensions (WHD)
• 11.5 x 7 x 4.5 inch / 292 x 178 x 114 mm

• Notes

• Two versions of this model are known with a variation in the push pull output transistors.

  1. 2SB52 PNP transistors are used in the pushpull output stage.
  2. 2T8 NPN transistors with bias provided by a 1T51 diode in the pushpull output stage.

  Known case colours are, blue, bone, beige & olive green.

  Ian Batty has written a very informative article on this model in the Silicon Chip magazine, March, 2017.

  . 

• Net weight (2.2 lb = 1 kg)
• 1.5 kg / 3 lb 4.9 oz (3.304 lb)

• Price in first year of sale
• 59.00 Dolar

• Source of data
• -- Original prospect or advert

• Mentioned in
• Silicon Chip, March 2017, page 90

• Author
• Model page created by Hugo Sneyers. See "Data change" for further contributors.

• Other Models

• Here you find 4057 models, 3914 with images and 974 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sony Corporation; Tokyo