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ID = 83555
Soviet Union
Brand: Common type USSR (SU) tube/semicond.
Tube type:  Vacuum Pentode   Power/Output 
Identical to 4L20_Tesla
Similar Tubes
Normally replaceable-slightly different:
Other base:
Other base and other heater:

Base Loctal-8, B8G (Sylvania, 1938)
Was used by Military and/or Government
Filament Vf 2.1 Volts / If 0.65 Ampere / Direct / Battery =

Heizfaden mit Mittelanschluss, bei Reihenschaltung 4,2V; 0,325A

Information source Universal Vade-Mecum, Electron Valves and Semiconductor Devices   

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