• Country
• Hungary

• Manufacturer / Brand
• Telefongyar, Terta (TRT, Export = Orion); Budapest

• Year
• 1959/1960

• Category
• Medical Technology

• Radiomuseum.org ID
• 183472

• • Brand: Terta, TRT

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

• Number of Transistors
• 4

• Semiconductors
• OC603 П14 П14 П14

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Hearing aid

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / 2 × 2,4 Volt

• Loudspeaker
• - only for Earphone!

• Material
• Metal case

• from Radiomuseum.org
• Model: Hearing Aid 4002 - Telefongyar, Terta TRT, Export

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

• Dimensions (WHD)
• 64 x 42 x 19 mm / 2.5 x 1.7 x 0.7 inch

• Net weight (2.2 lb = 1 kg)
• 0.075 kg / 0 lb 2.6 oz (0.165 lb)

• Source of data
• Radio es Televizio Vevö Keszülekek, 1960-63

• Literature/Schematics (1)
• Rádiótechnika 1961.

• Author
• Model page created by Sándor Selyem-Tóth. See "Data change" for further contributors.

• Other Models

• Here you find 218 models, 203 with images and 55 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Telefongyar, Terta (TRT, Export = Orion); Budapest