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I once had a selenium rectifier go dead short and take out the power transformer in a matter of seconds, luckily, it was a crappy beat up plastic radio.
I'm always replacing them with silicon parts after that.
The only ones i'm willing to leave alone are the full wave seleniun bridges used in my Lesa tape recorders, because they were oversized and ran cool, and also because there's a fuse to protect the transformer in case they short.
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