• Country
• Belgium

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

• Year
• 1936/1937

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 31072

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

• Number of Tubes
• 7

• Valves / Tubes
• 6D6 6A7 6B7 42 6G5 42 80

• Main principle
• Superhet with RF-stage; ZF/IF 123 kHz; Reflex

• Tuned circuits
• 7 AM circuit(s)

• Wave bands
• Broadcast, Long Wave and Short Wave.

• Power type and voltage
• Alternating Current supply (AC) / 110; 130; 140; 220; 240 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 26 cm = 10.2 inch

• Power out
• 10 W (unknown quality)

• Material
• Wooden case

• from Radiomuseum.org
• Model: Super Ondolina 637A2 - SBR Société Belge Radio-

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

• Dimensions (WHD)
• 420 x 530 x 380 mm / 16.5 x 20.9 x 15 inch

• Notes
• • The 637x series radios have an automatic loudness control to compensate for the loss of sensitivity of the human ear in low and high frequencies at low soundlevels.
  • Silent tuning.
  • There are 2 output tubes in push-pull to provide for powerfull audio in combination with a 26 cm loudspeaker behind an acoustic lens.
  • SBR produced the following models 637:
    • 637x2: table model with loudspeaker;
    • 637x3: luxury console;
    • 637x4: Luxury console with pickup from Marconiphone.

  where 'x' represents 'A' (AC mains) or 'U' (Universelle, AC/DC mains).

• Price in first year of sale
• 2,550.00 BFr

• Author
• Model page created by Bruno Brasseur. See "Data change" for further contributors.

• Other Models

• Here you find 718 models, 666 with images and 393 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from SBR Société Belge Radio-Electrique, Bruxelles