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This was pulled out of a Crown amplifier. What would it be classified as?

Mid Grade.
Here to learn like everybody
MY EVALUATIONS ARE MY OWN OPINION

mid as cat said, remove the glue aroudn the big cap, on a side note the black mosfets with the white paste on them are mostly copper. i'm told some yards take them at number 2 copper. you could also take a handful of them, wrap them in a rag or put them ion a bag and whack them with a hammer to remove the copper backs off them.
If you have the time if might be worth going that route as mid grade is 50 cents a lb vs #2 being around 4$ a lb.

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My yard takes the mosfets as dirty brass. You can, as mentioned above, remove the plastic and put them in copper number bucket.

My yard also takes capacitors as dirty aluminum. I am now getting into the habit of removing them from my boards. I don't believe this will hurt grading as there isn't any gold bearing material in them.

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Learning to grade or grading to learn.