Summary
6V4 dual diode, maker is unknown, but is probably Philips, Australia.
It was  full wave rectifier in electronic power supplies, with an output of 70 ma per plate.
It had a 6.3 volt indirectly heated cathode.
Physical Description
Noval (nine pin) tube.
More Information
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                                Acquisition InformationUnknown Acquisition Method from Unknown Source, 17 Feb 1972 
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                                Manufacturer (Probable)
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                                InscriptionsOn bulb: N20 
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                                Overall Dimensions76 mm (Length), 22 mm (Outside Diameter) 
 
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