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This is a mystery. It looks like a small corona voltage stabiliser. The ceramic insulators suggest high voltage. I tested it with up to 400 volts through a high value resistor but that voltage was too low to see any stabilising.
LCT - is this the maker?
The thin glass tube envelope is 9 mm in diameter and, excluding the base wires, is 43 mm tall.
References: Observation.


Updated May 19, 2020.
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