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Unknown component...

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russ57:
This is in an elma antimag demagnetizer.
I think it is just a pair of diodes. But I'd like to be sure. It has 3 terminals and measures about 5Mohm both forward and reverse across each supposed diode.

BillTodd:
looks like some kind of rectum frier to me .

Have you a diode test setting on your multimeter?  if so you should be able to read the forward voltage and check each diode.

Bill]

russ57:
I do, but it is effectively open circuit.
(ie, I think it is dead). Drawing out the circuit to make sure diodes make sense.
(not some odd scr or other complexity)

Muzzerboy:
Looks very similar to this full bridge rectum frier. But perhaps just a half bridge with 2 diodes.
https://www.ebay.co.uk/itm/124664837051

Sea.dog:
It's a half-wave rectifier.

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