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ID = 81125
Brand: Common type Japan tube/semicond.
Tube type:  High Voltage Half-Wave Mercury-Vapor Rec   Power-supply 
Identical to HV-972A
Similar Tubes
Other shape (e.g. bulb type):

Base Jumbo 4-pin bayonet (1918) Top contact with a cap.
Was used by Transmittertube (Radio)
Filament Vf 5 Volts / If 10 Ampere / Direct

Large cap, jumbo 4-pin base. Japanese equivalent for 872A. Smoked spherical bulb.

  • 7.5 kV PIV anode voltage
  • 1.25A average cathode current
Dimensions (WHD)
incl. pins / tip
100 x 260 x mm / 3.94 x 10.24 x inch
HV-972A: Private collection
Emilio Ciardiello

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