Request Information on unknown tube.

I would like to reccive any information anyone might have on the attached unknown tube.

Regards

Bruce Morgenstern

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It's very like an EHT rectifier diode

Compare DY51 and DY87.

The filamentary cathode is driven by a couple of turns of  EHT cable on the LOPT.

A TV CRT anode would be driven by the cathode of a rectifier. But a Travelling Tube and some Oscilliscope CRTs use negative EHT on the cathode and an earthed anode. Such tubes would be driven by the anode of the rectifier, the top cap.

I expect the housing has two contacts for filament/cathode and that the actual tube can be removed from it and either is wire ended or has pins.

To thank the Author because you find the post helpful or well done.