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ID = 2568
Brand: Tungsram; Budapest (see also British T.)
Tube type:  Triode, vacuum   RF/IF-Stage 
Identical to R406
Similar Tubes
Normally replaceable-slightly different:
First Source (s)
21.Jun.1929 : Radio-Expres, Netherlands

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Filament Vf 4 Volts / If 0.06 Ampere / Direct / Battery =
Description gm=1.4, Ra=18k 
Information source Radio-Expres, Netherlands   
Taschenbuch zum Röhren-Codex 1948/49   
R406: Photo of tube from my collection - TS
Tomasz Szczesniak

R406: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

R406: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

from Just Qvigstad

Usage in Models 1= 1928?? ; 2= 1928 ; 1= 1929 ; 1= 1930 ; 1= 1931

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):6

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