S21B

Siera; Belgien

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  • Year
  • 1938
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 98811

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

 Technical Specifications

  • Number of Tubes
  • 4
  • 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: S21B - Siera; Belgien
  • Shape
  • Tablemodel, low profile (big size).
  • Dimensions (WHD)
  • 500 x 265 x 200 mm / 19.7 x 10.4 x 7.9 inch
  • Notes
  • 3 Band reception:
    • LW: 720 - 2000 m.
    • BC: 198 - 585 m.
    • SW: 16,5- 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 on the left of the cabinet to reduce power consumption.
     
    This model is the electronic equivalent of Philips 628B and Radiola RA21B. 

    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)
  • 7.5 kg / 16 lb 8.3 oz (16.52 lb)
  • Price in first year of sale
  • 1,995.00 BEF
  • Mentioned in
  • - - Manufacturers Literature (Siera memento of tubes and models 1932-1946)
  • Author
  • Model page created by John Koster. See "Data change" for further contributors.

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