• Country
• Austria

• Manufacturer / Brand
• Stefra (Marke), Rudolf Franek; Wien

• Year
• 1959

• Category
• Detector-Radio (Crystal or diode, without tubes/transistors)

• Radiomuseum.org ID
• 10741

• • Brand: Franek, Rudolf; Wien

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

• Number of Transistors
• 1

• Semiconductors
• OC75

• Main principle
• Crystal or Solid State Detector; Crystal-detection 1 circuit (no tubes)

• Tuned circuits
• 1 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / 3 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Transistor Detektor TDA - Stefra Marke, Rudolf Franek;

• Dimensions (WHD)
• 65 x 40 x 80 mm / 2.6 x 1.6 x 3.1 inch

• Notes
• Speisung mit geteilter 3V-Stabbatterie. MW in 2 Bereichen: B1= 200-350m, B2= 300-600m. Transistorverstärkung: min. 50-fach. Abstimmung durch verstellbaren Eisenkern.

• Net weight (2.2 lb = 1 kg)
• 0.1 kg / 0 lb 3.5 oz (0.22 lb)

• Price in first year of sale
• 139.00 ATS

• External source of data
• E. Erb 3-907007-36-0

• Source of data
• Radiokatalog Band 2, Ernst Erb

• Mentioned in
• RADIOBOTE, Österr. (Heft 22/2009, S.7 ff, Gerätebeschreibung)

• Other Models

• Here you find 20 models, 19 with images and 4 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Stefra (Marke), Rudolf Franek; Wien