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S51U; Siera; Belgien (ID = 1502483) Radio S51U; Siera; Belgien (ID = 1024674) Radio
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S51U; Siera; Belgien (ID = 1502483) Radio
Siera; Belgien: S51U [Radio] ID = 1502483 500x357
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For model S51U, Siera; Belgien:
Siera Radio Modèles 1939
Country:  Belgium
Manufacturer / Brand:  Siera; Belgien
Year: 1938/1939 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 6: EK2 EF9 EBC3 EL3 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: S51U - Siera; Belgien
Material Wooden case
Shape Tablemodel, low profile (big size).
Dimensions (WHD) 520 x 300 x 235 mm / 20.5 x 11.8 x 9.3 inch
3 Band reception:
  • LW: 708 - 2000 m.
  • BC: 186 - 585 m.
  • SW: 16,7 - 51 m.
Tuning scale light bulbs type: 2 x 8045 (6,3V, 320mA).
Loudspeaker Philips type 9636. Connectors for second loudspeaker and for pick-up. Tone control.

This model is virtually an upgraded type S51A with vibrator incorporated. The price of 2100 BFr is that of S51A (1850 BFr) plus vibrator (250 BFr).

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

Until now, no S51U radio has been found. It is possible that the model type is S51AU as written in the Siera memento.

Price in first year of sale 2'100.00 BEF
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) -- Original-techn. papers. (from model Siera 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.