• Country
• Belgium

• Manufacturer / Brand
• Siera; Belgien

• Year
• 1940/1941

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 97160

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

• Number of Tubes
• 4

• Valves / Tubes
• DK21 DF21 DAC21 DL21

• Main principle
• Superheterodyne (common); ZF/IF 473 kHz; 2 AF stage(s)

• Tuned circuits
• 6 AM circuit(s)

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

• Power type and voltage
• Storage and/or dry batteries / 2 & 120 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 21 cm = 8.3 inch

• Material
• Wooden case

• from Radiomuseum.org
• Model: S133B - Siera; Belgien

• Shape
• Tablemodel, low profile (big size).

• Dimensions (WHD)
• 510 x 270 x 210 mm / 20.1 x 10.6 x 8.3 inch

• Notes
• 3 Band reception:
  • LW: 708 - 2000 m.
  • BC: 186 - 585 m.
  • SW: 16,7 - 51 m.
  Loudspeaker Philips type 9686 or 7660. Connectors for second loudspeaker and for pick-up. 
   
  This model is comparable with Philips 614B, NSF H132B and Waldorp 120 with DK21.

• Price in first year of sale
• 125.00 Hfl

• Source of data
• Technisch- Commercieel - Radio Vademecum Staleman

• Mentioned in
• -- Original prospect or advert

• Literature/Schematics (1)
• -- Original-techn. papers. (Generic model 133B dated 1940)

• Author
• Model page created by John Koster. See "Data change" for further contributors.

• Other Models

• Here you find 456 models, 414 with images and 188 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Siera; Belgien