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S53U; Siera; Belgien (ID = 1024675) Radio
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S53U; Siera; Belgien (ID = 1024675) Radio
Siera; Belgien: S53U [Radio] ID = 1024675 180x114
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For model S53U, Siera; Belgien:
Bild aus Siera-Vademecum.
Country:  Belgium
Manufacturer / Brand:  Siera; Belgien
Year: 1938/1939 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 6: EK2 EF9 EBC3 EBL1 EM1 AZ1
Main principle Superheterodyne (common); ZF/IF 128 kHz; 2 AF stage(s)
Tuned circuits 7 AM circuit(s)
Wave bands Broadcast, Long Wave and Short Wave.
Power type and voltage AC/DC-set / AC: 110; 125; 145; 200; 220; 245 / DC: ? Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 21.5 cm = 8.5 inch
Power out
from Model: S53U - Siera; Belgien
Material Wooden case
Shape Tablemodel with Push Buttons.
Dimensions (WHD) 535 x 355 x 230 mm / 21.1 x 14 x 9.1 inch
3 Band reception:
  • LW: 720 - 2000 m.
  • BC: 195 - 585 m.
  • SW: 16,7 - 51 m.
Tuning scale light bulbs type: 3 x 8045 (6,3V, 320mA). The booklet "Siera memento of tubes and models 1932-1946" mentions 3 light bulbs for this radio, where the schematic and Staleman mentions only 2.
Some other properties:
  • Loudspeaker Philips type 9602, having an extra cone to reduce the beaming effect at high frequencies.
  • Connectors for second loudspeaker and for pick-up.
  • Variable selectivity coupled to the tone control.
  • Eight preselection buttons and manual tuning.
  • AF feedback circuitry to reduce distortion.

This model is an upgraded type S53A with vibrator convertor incorporated. The price of 3000 BEF is that of S53A (2750 BEF) plus vibrator (250 BEF).

This model is comparable with Philips 750U.

Until now, no S53U radio has been found. It is possible that the model type is S53AU as written in the Siera memento.

Price in first year of sale 3'000.00 BEF
Mentioned in - - Manufacturers Literature (Siera memento of tubes and models 1932-1946)
Literature/Schematics (1) -- Original-techn. papers. (from model S51A)

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

All listed radios etc. from Siera; Belgien
Here you find 434 models, 393 with images and 178 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.