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What is this component marked with DB3? It is from an inductor from a tube light.

Component

I don't think it is a diode, as it has no bands.

What is this?

Note: Picture is from internet. I have an almost identical ballast to this one, and it has the DB3 in that location.

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This is DIAC - there is link http://www.spiratronics.com/data/1540.pdf .

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