- Country
- Hungary
- Manufacturer / Brand
- Telefongyar, Terta (TRT, Export = Orion); Budapest
- Year
- 1926–1932
- Category
- Loudspeaker, headphone or earphone
- Radiomuseum.org ID
- 141918
-
- Brand: Terta, TRT
- Wave bands
- - without
- Power type and voltage
- No Power needed
- Loudspeaker
- - Is a Headphone or Earphone
- Material
- Various materials
- from Radiomuseum.org
- Model: Tetrafon - Telefongyar, Terta TRT, Export
- Notes
- 4000 Ohm.
- Net weight (2.2 lb = 1 kg)
- 0.250 kg / 0 lb 8.8 oz (0.551 lb)
- Price in first year of sale
- 12.00 Pengő
- Mentioned in
- Rádió-Árjegyzék 7. 1927.
- Literature/Schematics (1)
- Magyar Wolframlámpagyár Kremenezky János Rt. Rádiókatalógus ~1926
- Literature/Schematics (2)
- Rádió Készülékek Árjegyzéke, Telefongyár Budapest, ~1928
- Literature/Schematics (3)
- -- Original prospect or advert (Barta és Társa Árjegyzék - BAPO 42, BP. 1932.)
- Literature/Schematics (4)
- Reich Miklós katalógus, Budapest 1930.
- 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