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ID = 29423
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  SPECIAL TUBE, other or unknown   Text 
Identical to GRD7

Base Octal (Int.Octal, IO) K8A, USA 1935
Was used by Technology / Measurement
Filament Vf 6 Volts / Direct

Cylindrical diode with guard cylinders at each end. Tungsten filament
Designed as a laboratory device with which e/m ratio can be estimated through the application of external magnetic fields whilst measuring the anode current as in the cylindrical magnetrin devised by Hull. Also usable as saturated diode in AC voltage stabilizing circuits

Information source -- Original-techn. papers.   
GRD7: Private collection
Emilio Ciardiello

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GRD7: Manufacturer's Literature
Emilio Ciardiello

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