Summary
General purpose high vacuum triode with an unusual planar construction.
2.7 volt directly heated cathode.
Manufacturer: AEG-Telefunken, Germany
Physical Description
Cylindrical glass bulb with insulating base. 4 pin Telefunken style base with three male pins and one female pin. Paper band in a channel around the base. This valve had a planar structure with a flat circular anode with a flat spiral grid above it and a catenary filament above that.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from Wireless Institute of Australia, Mr Max Howden, 28 Apr 1967
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Manufacturer
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Inscriptions
Bulb: Telefunken/DRP/TypeEVN171/Nr 191286-1 Base(paper band): Gepruft/(illegible)/In Betrieb/Unbrauchbar The letters "EVN" in the type number mean: Empfänger Verstärker Niederfrequenz - Receiver Amplifier Low frequency. The inscription on the base: "In Betrieb Unbrauchbar" literally means "In enterprise useless" which may be equivalent to the common English inscription: "For Amateur Use Only".
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Classification
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Category
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Discipline
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Type of item
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Overall Dimensions
116 mm (Length), 42 mm (Outside Diameter)
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References
[Book] Tyne, Gerald F. 1987. Saga of the Vacuum Tube., 1987, 248 - 250 Pages
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