• Country
• People's Republic of China

• Manufacturer / Brand
• Tianjin 天津塘沽东方红无线电厂 Tianjin Tanggu Dongfanghong Radio Factory; where?

• Year
• 1966 ??

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 175352

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

• Number of Transistors
• 4

• Semiconductors
• 3AG4 3AG4 3AX13 3AX14 2AP1_Diode 2AP1_Diode

• Main principle
• Superheterodyne (common); ZF/IF 465 kHz

• Tuned circuits
• 4 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / 4 x 1.5 Volt

• Loudspeaker
• Permanent or electro-dynamic (moving coil), system not known yet.

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Hai He 海河 BS-402 [TTD] - Tianjin 天津塘沽东方红无线电厂

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

• Dimensions (WHD)
• 240 x 150 x 65 mm / 9.4 x 5.9 x 2.6 inch

• Notes
• Brand is 海河,Hai He in Mandarin. Hai He is a system of five waterways around Tianjin, flowing into Bohai 渤海 at Dagukou. This model was also made by 天津渤海无线电厂, Tianjin Behai Wireless Factory - with the same brand and model designation.

• Literature/Schematics (1)
• 01-Transistor Radio Manual 1972, 2nd Ed. 2nd Print 1983 (page 60 - for the two Manufacturers.)

• Author
• Model page created by Ernst Erb. See "Data change" for further contributors.

• Other Models

• Here you find 3 models, 2 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Tianjin 天津塘沽东方红无线电厂 Tianjin Tanggu Dongfanghong Radio Factory; where?