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165R4G

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ID = 40306
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Current Regulator, Urdox with FeH 
Identical to 165R4G = 165R4

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Filament
Literature Taschenbuch zum Röhren-Codex 1948/49   
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Usage in Models 2= 1939?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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