@th Left could be a selenium rectifier. The right ones look like capacitors, though I haven’t seen ones built like this in quite as large.
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@fruchti based on the schematic @transmundane linked to, it probably is a rectifier to turn the AC power input into DC. The X label and `>>` symbol are very different from modern ones.
@th @transmundane Neat! That symbol is new to me as well.
@th @fruchti
Ah hah!
https://en.wikipedia.org/wiki/Metal_rectifier