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1Е4А-В (1Е4А-В)

Jacob Roschy Martin Renz Ernst Erb Bernhard Nagel Eilert Menke 
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Forum » Valves / tubes - Semiconductors » VALVES/TUBES / SEMICONDUCTORS in RADIOMUSEUM » 1Е4А-В (1Е4А-В)
Michael Watterson
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27.Jul.15 23:13

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This tube isn't exactly the same as DM70 but is a similar function of Magic Eye. The window is fully lit at about -0.25V and only a dot remains at about -7.5V.

It may be for NiCd (1.1V nominal) rather than Zinc Carbon (1.4V nominal).