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B-I

Information - Help 
ID = 28409
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  TRIODE (Detail uncertain) 
Identical to B-I
First year Apr.1922 Saga of the Vacuum Tube, Tyne Seite 416

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament
Description also with Telefunken 4 pin base. 
 
b4_base_pins~~375.png
B-I: Fin Stewart
Fin Stewart

 

from Just Qvigstad

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