• Country
• Belgium

• Manufacturer / Brand
• Siera; Belgien

• Year
• 1938/1939

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 98812

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

• Number of Tubes
• 4

• Valves / Tubes
• EK2 EF9 CBL1 CY1 C1 or C9

• Main principle
• Superheterodyne (common); ZF/IF 128 kHz; 1 AF stage(s)

• Tuned circuits
• 7 AM circuit(s)

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

• Power type and voltage
• AC/DC-set / 110-125; 200-225 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 21.5 cm = 8.5 inch

• Material
• Bakelite case

• from Radiomuseum.org
• Model: S50U - Siera; Belgien

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

• Dimensions (WHD)
• 510 x 290 x 235 mm / 20.1 x 11.4 x 9.3 inch

• Notes
• 3 Band reception:
  • LW: 708 - 2000 m.
  • BC: 198 - 585 m.
  • SW: 16,7 - 51 m.
  Tuning scale light bulb type: 8092 (10V, 200mA).
  Loudspeaker Philips type 9636. Tone control. Current regulator C1 used for 200 - 225 V mains, C9 used for 110 - 130 V mains.
  As opposed to model S50A, this radio has no connectors for an external speaker or for pick-up.
  This model is comparable with Philips 470U.

  The original folder specifies DC mains supply for S50U, while the configuration is suitable for operation on AC/DC mains.

  Attention: chassis connected to the mains !

• Net weight (2.2 lb = 1 kg)
• 9.7 kg / 21 lb 5.9 oz (21.366 lb)

• Price in first year of sale
• 1,410.00 BFR

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

• Literature/Schematics (1)
• -- Original prospect or advert (Siera Radio Modèles 1939)

• Literature/Schematics (2)
• -- Schematic (Philips 470U)

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

• Other Models

• Here you find 440 models, 400 with images and 178 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Siera; Belgien