• Country
• Netherlands

• Manufacturer / Brand
• Amroh NV (Radio Bulletin monthly), Muiden

• Year
• 1957

• Category
• Kit (Parts plus instruction) or building instructions only

• Radiomuseum.org ID
• 124716

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

• Number of Transistors
• 1

• Semiconductors
• OC71

• Wave bands
• - without

• Power type and voltage
• Dry Batteries / 4,5 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Bakelite or Plastics (type unknown)

• from Radiomuseum.org
• Model: T.V.M. UN-50 - Amroh NV Radio Bulletin

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

• Notes
• Transistor "Hilfsgerät" (Gleichstromverstärker). Machte von Drehspuhlmesser (1 mA) ein Universal-Voltmesser (Sensitivität 40,000 Ohm/V). Bereiche (DC) 25µA - 2,5V - 10V - 50V - 250V. Potentiometer zur Nullabgleich. Wurde gebaut auf "Uniframe"-Chassis, deshalb Modell-Type "UN-50". Man brauchte nur ein Transistor (OC71).

• Mentioned in
• -- Original-techn. papers. (Radio Bulletin, No.3, 1957, pag.203-206 und pag.216.)

• Author
• Model page created by Aren van Waarde. See "Data change" for further contributors.

• Other Models

• Here you find 240 models, 208 with images and 231 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Amroh NV (Radio Bulletin monthly), Muiden