This is an odd rectifier, probably designed for EHT use, The shielded filament is helical and mounted horizontally. Sadly it is open circuit.![](../pics/acf0331a.jpg)
The shielded filament.![](../pics/acf0331b.jpg)
The flat anode.![](../pics/acf0331c.jpg)
The medium Edison screw base.The balloon envelope is 30 mm in diameter and, excluding the MES base, is 137 mm tall.Reference: Observation. |
Updated May 22, 2023.
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