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The VLS405A is a neon indicator lamp with a very complicated construction.
The envelope has a pinch at both ends and the electrodes are discs placed close together in the centre of the tube. The evacuation tube is on the right. The central region where the discharge would be found is obscured - possible through over running.
The electrode from the evacuation tube end.
The two wires from this end are connected to the same disc - overkill.
The thin glass tube envelope is 19 mm in diameter, and including the base is 55 mm tall.
Reference: Data-sheet. Type VLS405A was first introduced in 1939. See also 1939 adverts.


Absolute Maximum Operating Conditions
General Notes
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 12, 2019.
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