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Why the weird input jacks on some EBMM guitars?

I don't know what era of jack you have, three or four pole, and as I recall the four were earlier. But if you pursue original EBMM replacements, you might find this conversion info helpful. Then, if you opt into converting to a three pole jack that then allows you to use any TRS jack of your choosing. The difference between the two was how the battery was switched into the system.
View attachment 56447
Good stuff, @nervous ! Saving that one for later.
 
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