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.

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