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30L31

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ID = 56024
       
Country:
Czechoslovakia
Brand: Tesla; Praha, Bratislava etc.
Tube type:  Beam Power Tube 
Identical to 30L31

Base Miniatur-7-Pin-Base B7G, USA 1940
Filament Vf 30 Volts / If 0.15 Ampere / Indirect / Specified current AC/DC ~ = (Series working)
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Just Qvigstad

Collection of

 
30l31-ultron-p1-s.jpg

 

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