• Country
• People's Republic of China

• Manufacturer / Brand
• Unknown - CUSTOM BUILT: China

• Year
• 1974 ??

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 304357

• Number of Transistors
• 6

• Semiconductors
• 3DG201 3DG201A 3DG201B 3DG201A 3DG201A 3DG201A

• Main principle
• Superheterodyne (common)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / 2 x 1,5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5.6 cm = 2.2 inch

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Wonder 831 - Unknown - CUSTOM BUILT: China

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 120 x 65 x 27 mm / 4.7 x 2.6 x 1.1 inch

• Net weight (2.2 lb = 1 kg)
• 0.160 kg / 0 lb 5.6 oz (0.352 lb)

• Author
• Model page created by José Manuel Silvestre. See "Data change" for further contributors.

• Other Models

• Here you find 524 models, 503 with images and 29 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Unknown - CUSTOM BUILT: China