• Country
• Belgium

• Manufacturer / Brand
• Siera; Belgien

• Year
• 1939/1940

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 97140

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

• Number of Tubes
• 4

• Valves / Tubes
• KCH1 KF4 KB2 KL5

• Main principle
• Superheterodyne (common); ZF/IF 128 kHz; 2 AF stage(s); Reflex

• Tuned circuits
• 7 AM circuit(s)

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

• Power type and voltage
• Storage and/or dry batteries / 2 & 135 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 20 cm = 7.9 inch

• Material
• Wooden case

• from Radiomuseum.org
• Model: S22B - Siera; Belgien

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

• Dimensions (WHD)
• 500 x 265 x 182 mm / 19.7 x 10.4 x 7.2 inch

• Notes
• 3 Band reception:
  • LW: 708 - 2000 m.
  • BC: 198 - 585 m.
  • SW: 16,8- 51 m.
  Tuning scale light bulbs type: 8017D (2V, 210mA).
  Loudspeaker Philips type 9614. Connectors for second loudspeaker and for pick-up.  There is a switch to reduce power consumption.
   
  This model is comparable with Philips 629B, Philips 631B, NSF H112B, Radiola RA21B and Waldorp 112. 

  The anode supply (B+) is defined by Siera at 135 Volt, where for the Philips 628B the  B+ battery voltage is 144 Volt. Also Cortenberghe defines the B+  at 144 Volt.

• Net weight (2.2 lb = 1 kg)
• 8.2 kg / 18 lb 1 oz (18.062 lb)

• Price in first year of sale
• 1,995.00 BEF

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

• Mentioned in
• - - Manufacturers Literature (Siera memento of tubes and models 1932-1946)

• Literature/Schematics (1)
• -- Original-techn. papers.

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

• Other Models

• Here you find 452 models, 413 with images and 181 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Siera; Belgien