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S4U; Siera; Belgien (ID = 1913028) Radio
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S4U; Siera; Belgien (ID = 2452181) Radio
Siera; Belgien: S4U [Radio] ID = 2452181 1400x1704
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For model S4U, Siera; Belgien
Country:  Belgium
Manufacturer / Brand:  Siera; Belgien
Year: 1936 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 5: EK2 EF5 EB4 EL3 EZ3
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; 145; 200; 220; 245 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 21.5 cm = 8.5 inch
Power out
from Model: S4U - Siera; Belgien
Material Wooden case
Shape Tablemodel, high profile (upright - NOT Cathedral nor decorative).
Dimensions (WHD) 340 x 400 x 270 mm / 13.4 x 15.7 x 10.6 inch

This is basically the same radio as model S4A, with a different transformer and adapted power section to accomodate the vibratory convertor with reference number 28.891.460.

The Siera vademecum 1932-1946 mentions the same tube line-up for types S4A and S4U. The Philips near equivalent for type S4U, being type 456U -20, only carries a schematic for the vibrator converter while referring to model 456A for the schematic of the radio itself. When fed by a DC mains, the power must pass via the converter. and not directly into the radio as usual with a AC/DC set.

3 Band reception:
  • LW: 725 - 2000 m.
  • BC: 198 - 585 m.
  • SW: 16 - 51 m.
Tuning scale light bulb type: 8045D (6,3V, 320mA).
Loudspeaker Philips type 2369. Connectors for second loudspeaker and for pick-up. 
Net weight (2.2 lb = 1 kg) 12.2 kg / 26 lb 14 oz (26.872 lb)
Price in first year of sale 2'300.00 BFr
Mentioned in - - Manufacturers Literature (Siera memento of tubes and models 1932-1946)
Literature/Schematics (1) -- Original-techn. papers. (Model Siera S4A)
Literature/Schematics (2) Trader Service Sheet (suppl. of Wireless & El. Trader, etc.) (594)

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.