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Haven't done this for awhile, but wouldn't the proper place to install a 3.5mm auxiliary jack be at the the red "X"? It's a 37-670.
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Patrick I would try it there and just above C48. I think C48 is part of the tone control. Even cutting in at the left side of C46. Using C46 as a coupling cap.
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[Image:
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Aha! Then I wouldn't need to install another coupling cap on the jack! Looks cleaner.