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ID = 3684
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Mag. Eye, 4 shadow angles   Indication 
Identical to 4678 = EM1 = MEM1
Similar Tubes
Heater different:
  4677 ; AM1
First Source (s)
May.1936 : Philips Bulletin
Predecessor Tubes 4662  
Successor Tubes EM1  

Base Europe side contact P8A (Au P, 8SC) (Codex=S)
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC
Description 4678 was the preliminary designation for the EM1, before letter "M" was assigned for indicator tubes. Babani erroneously states the AM1 as an equivalent. 
Text in other languages (may differ)
Information source Taschenbuch zum Röhren-Codex 1948/49   

90_8.png 4678: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad
Usage in Models 19= 1936 ; 2= 1937? ; 1= 1937

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):22

Collection of



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