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RE: Heathkit AA-121 * PT hum * Coupling cap question

Thanks for clearing that up for me Jim. I'm letting the amp play for a while tonight to put some more time on the caps to hear if there's any difference. I will probably change them out this weekend and put in 0.1uf caps. I need to change out the old top hat diodes too. Again, thanks for the insightful explanation.

Larry D.


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