Do all CU24s go to instant feedback on the A note on the B String?

Probably all guitars will when standing that close to the amp at just the right angle.
 
The answer is no but kind of. What you are hearing is called a "wolf tone" (although that term is also used incorrectly for the opposite thing called a dead spot). Wolf tone is what remains after the dominant note fades and the overtones go into feedback. It only happens on certain frets and which fret depends on a lot of things. It happens on 24 fretters and on 22 fret guitars. Where yours is happens a lot but another guitar may have it on the 9th fret for example. I've heard them on Les Pauls too so it's not the scale length or the neck carve. If you can find a guitar with wolf tones and no dead spots, that's a keeper. Usually you end up with both.

Nice playing on a terrific song.
 
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