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ID = 2572
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to S21
Similar Tubes
Other characteristic (electr. data):
Other base:

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Er) Top contact screw type.
Filament Vf 2 Volts / If 0.1 Ampere / Direct / Battery =
Description Lower gain version of the S22 for use in multi-stage receivers 
Information source Experimental Wireless & Wireless Engineer   Advert. Aug 1931
Taschenbuch zum Röhren-Codex 1948/49   
S21: own collection
John Koster

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S21: osram wireless guide 1931
Giuseppe Antonio Tusini

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from Just Qvigstad

Usage in Models 1= 1931 ; 3= 1932 ; 4= 1933 ; 3= 1934

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):11

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