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Hyper-Power-Bivolt

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ID = 49874
       
Country:
Great Britain (UK)
Brand: Dario - Impex Electrical Ltd. (see also Dario France); London
Tube type:  Triode, vacuum   Power/Output 
Identical to Hyper-Power-Bivolt
Similar Tubes
Heater different:
  Hyper-Power-Fourvolt

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 2 Volts / If 0.3 Ampere / Direct / Battery =
Literature - - Manufacturers Literature   Advertisement December 1929
 
hyper_power_bivolt_data.png
Hyper-Power-Bivolt: Wireless World 4. Feb. 1931
Anonymous 15 Collector


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