Ondolina 1924 - 1st gen. - front 2

SBR Société Belge Radio-Electrique, Bruxelles

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  • Year
  • 1924
perfect model
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 228357

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

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • TRF with regeneration; 2 AF stage(s)
  • Tuned circuits
  • 2 AM circuit(s)
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • Storage and/or dry batteries / 4 & 80 & -4.5 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Wooden case, TUBES VISIBLE.
  • from Radiomuseum.org
  • Model: Ondolina [1924 - 1st gen. - front 2] - SBR Société Belge Radio-
  • Shape
  • Tablemodel, slant panel.
  • Notes

  • The early Ondolina desk models were built in the period 1923-1927 and can be characterized by the year of construction, the generation and type of front.

    • Model 1924 (1st gen - front 1) with bronze front and silvery labels has 3 connectors for the headphone or loudspeaker, one for each sound level depending on the number of amplifying tubes (2, 3 or 4). The power wires are connected to the front. Reduction knobs (for fine tuning) on the primary and secondary tuning capacitors are optional. Like all models up till model 1927 (2nd gen.), this model is provided with an internal negative grid 4,5 V battery.
      Alternative tube set: 4 x R5 or Marconi ‘R’ or Philips E, also for the following models up till model 1926.
    • Model 1924 (1st gen - front 2) has a bronze front and brass-colored labels.
    • Model 1924 (2nd gen) with bronze front and brass-colored labels has only 2 connectors for headphone or loudspeaker. The middle one is replaced by a light bulb, serving as fuse.
    • Model 1925 (front 1) with bronze front and brass-colored labels has a volume switch instead of the light bulb. The power wires are connected to the back panel.
    • Model 1925 (front 2) has an aluminum front with black characters.
    • Model 1926 also has an aluminum front with black characters. A reduction knob becomes standard on the secondary tuning capacitor, the other one is still optional. There are 2 rheostats for the filaments. Following tubes were recommended up till model 1927 (2nd gen): A410, A410, A410, A406 or B406.
    • Model 1926 [Réseau] is a combination of model 1926 with a power supply in a wooden case, mounted under the model.
    • Model 1927 (1st gen) has a bronze front with silvery labels. Power wires are still on the back panel.
    • Model 1927 (2nd gen - front 1) has a bronze front with silvery labels, with serial number 254913 and up. Power connectors on the back panel instead of wires and no built-in negative grid 4,5 V battery anymore. The negative grid voltage remains necessary but must be supplied by an external battery.
    • Model 1927 (2nd gen. - front 2) has a brass front with black labels.
    • Model 1927 (2nd gen. - front 3) has a brass front with copper-colored labels.

    These Ondolina models could also be operated with an external power supply, type Résolina or type M30. In that case, the negative grid voltage battery was still necessary, since the mentioned power supplies couldn’t provide that voltage.

  • Author
  • Model page created by Dirk Bladt. See "Data change" for further contributors.

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