Cold Rectifier.

It has no filament, like other (vacuum tube) rectifiers.

Cheers,

Bob

> I have a super easy question. I've been looking at a lot of scrap circuit
> boards kickin around here, and I always notice little parts (usually look
> like SMT transistors) which are silkscreen labelled CR1, CR2, etc...  What
> does CR stand for?  The only thing I can thing of is Comparator.  Is that
> right?

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