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ID = 12983
Great Britain (UK)
Developer: MO Valve Co. Ltd.; GB 
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
  Ca. 1925 up to 1945 rare.
Identical to S625 = DES625
Similar Tubes
Normally replaceable-slightly different:
  ARS6 ; CV1317
Multiple differences or of other kind:
First year 1927 Tube leaflet collection E.Erb Analysis by original leaflets

Base SPECIAL TUBEBASE in general (Codex=sp) Base on each end.
Was used by Radio/TV-reception etc.
Filament Vf 6 Volts / If 0.25 Ampere / Direct / Battery =

Vf given as 5 to 6 volts. Va=120, Vs=80, Z=175k, Amp=110. (Dowsett Handbook Rev 1923.)
Grid and filament connections from 3 pin base . Anode and screen connections from 2 pin base. Made with Osram, Marconi and Gecovalve trade names. Also made by Marconi in Italy.

Dimensions (WHD)
incl. pins / tip
x 127 x 35 mm / x 5.00 x 1.38 inch
Weight 44 g / 1.55 oz
Tube prices 2 Tube prices (visible for members only)
Information source - - Manufacturers Literature   Pamphlet 243
- - Manufacturers Literature   
History of the British Radio Valve to 1940
The Saga of Marconi Osram Valve

s625.png S625: P.den Boer
Wolfgang Holtmann

S625: own collection
Peter den Boer

More ...
Usage in Models 1= 1927? ; 1= 1927 ; 1= 1929

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

Collection of



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