/ae/ tensing before all vowels is a characteristics of the Northern Cities Vowel Shift. You can hear professor Labov talk about this in this NPR recording, where you can hear the differences between the different ways Americans pronounce the /ae/ sound (pure /æ/ versus /eə/).
Otherwise here's a video of a senator from Wisconsin. Skip to 0:17 and listen to how he says "tax."
For more samples I suggest visiting this website, and listen to samples of people from Michigan, Wisconsin or Minnesota.
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