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ID = 51081
Tube type:  Triode, vacuum   UHF 
Identical to CV932 = GL-446A = 446A

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 6.3 Volts / If 0.75 Ampere / Indirect
Description "Lighthouse" Tube. First 'soldered-can' cathode, superseeded by 2C40. 446A was intended as RF amplifier in radar receivers. Noise figure as low as 10 dB at 1.0 GHz, versus 23 dB of other UHF tubes, like 368A 
Information source -- Original-techn. papers.   
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446a.png CV932
Emilio Ciardiello

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