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ID = 28457
Tube type:  Reflex Klystron 
Identical to CV237 = KR6/2
Predecessor Tubes 10AL1  

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap.
Filament Vf 4 Volts / If 1.5 Ampere / Indirect
Description Reflex klystron tunable from 3170 to 3390MHz. 100mW min. through the tuning range.
Factory assembled external tuner. 
Information source -- Original-techn. papers.   

Just Qvigstad
CV237: Manufacturer's Literature
Emilio Ciardiello

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