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ID = 28070
Tube type:  Beam Power Tube 
Identical to CV201 = V630

Base Top contact with a cap.
Filament Vf 2.2 Volts / If 1.1 Ampere / Direct
Description Aligned grids beam tetrode. 7.5W anode dissipation, 300V max anode voltage. 
Information source -- Original-techn. papers.   
CV201: PA3ESY Vintage radio collection
Jan Poortman

CV201: Manufacturer's Literature
Emilio Ciardiello

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