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4B4_4pin

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ID = 60256
       
Country:
Belgium
Brand: Ultron (tubes)
Tube type:  Vacuum Pentode   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to 4B4_4pin
Similar Tubes
Heater different:
  C443_4pin
Other base:
  4B4_Ultron

Base Sidecontact.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.15 Ampere / Direct / Specified voltage AC/DC

c443_4pinbase~~2.png 4B4_4pin
Peter den Boer

 
ultron_4b4.jpg

4B4_4pin
 

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