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ID = 28012
Tube type:  Noise Diode 
Identical to CV172 = E1468

Base Loctal-9-Pin (B9G)
Was used by Technology / Measurement
Filament Vf 6 Volts / If 1 Ampere / Direct

Tungsten filament saturated diode, designed to be used as RF noise generator.

18mA mean anode current, typically at 6.25 to 6.75 V.

7V max filament voltage, resulting in a reduced life in the order of 100 hours.

During WWII this tube was appreciated as one of the best noise source. The schematic diagram of a noise generator using CV172 is even given in the volume 'Microwave Receivers' from the MIT Radiation Laboratory series.

Information source -- Original-techn. papers.   

CV172: Vacuum Tube Ampl., MIT Rad Lab V18
Emilio Ciardiello

Just Qvigstad
CV172: Manufacturer's Literature
Emilio Ciardiello

Collection of



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