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ID = 12447
Great Britain (UK)
Brand: Cossor, A.C.; London
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to 410SG
Similar Tubes
Normally replaceable-slightly different:
  4075SG ; 4SC ; A442 ; RES094
Heater different:
  220SG ; 6075SG ; 610SG

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Er) Top contact screw type
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Battery =

Ra 200k ohms; gm = 1mA/V at Vg=-1.5 and Va=150.
Price 1.1 GBP in 1929.

Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
410SG: Photo of tube from my collection - TS
Tomasz Szczesniak

410SG: own collection
Peter den Boer

from Just Qvigstad

Usage in Models 2= 1931

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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