• Country
• Belgium

• Manufacturer / Brand
• SBR Société Belge Radio-Electrique, Bruxelles

• Year
• 1932/1933

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 75560

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

• Number of Tubes
• 5

• Valves / Tubes
• DSB DH DSB DSB DPT 251_Ballast

• Main principle
• Superheterodyne (common); ZF/IF 123 kHz; Anode bend detection

• Tuned circuits
• 7 AM circuit(s)

• Wave bands
• Broadcast (MW) and Long Wave.

• Power type and voltage
• Direct Current supply (DC) / 220 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• Material
• Wooden case

• from Radiomuseum.org
• Model: Super Ondolina 533C2 [220V] - SBR Société Belge Radio-

• Shape
• Tablemodel, Tombstone = decorative upright, not cathedral but can have rounded edges.

• Notes
• • This superheterodyne radio works on a simple wire antenna, where previous SBR superheterodyne models worked with a loop antenna.
  • Tuning scales with names and wavelenghts are standard from now on.
  • In the 110V DC version there are 2 output pentodes in parallel to compensate for the lower plate voltage, in the 220V DC version there is only 1 output pentode.
  • The ballast tube is only for the filaments; the tubes are working on a higher plate voltage than the 110V DC version.
  • SBR produced the following models 533:
    • 533x1: table model without loudspeaker;
    • 533x2: table model with loudspeaker;
    • 533x3: luxury console;
    • 533x4: luxury console with pick-up;

  where 'x' represents 'A' (AC mains) or 'C' (DC mains, 110 or 220V)

  • The "251_Ballast" current regulator (250mA; 60-180volt) can be replaced by any other brand of current regulator with the same or better specifications and the same foot (B4), like the Marconi "251_MOV" or the Philips "1934".

• Price in first year of sale
• 3,100.00 BFr

• External source of data
• P.H. Brans

• Author
• Model page created by Hugo Sneyers. See "Data change" for further contributors.

• Other Models

• Here you find 718 models, 666 with images and 391 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from SBR Société Belge Radio-Electrique, Bruxelles