Antique radios, Old Time Radios
GRD7
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Country:
Great Britain (UK)
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Brand:
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Ferranti, GB |
| Tube type: |
SPECIAL TUBE, other or unknown Text |
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| Identical to |
GRD7
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| Base |
Octal (Int.Octal, IO) K8A, USA 1935
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| Was used by |
Technology / Measurement |
| Filament |
Vf 6 Volts / Direct |
| Description |
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
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| Information source |
-- Original-techn. papers.
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Just Qvigstad
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GRD7: Manufacturer's Literature
Emilio Ciardiello
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