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Harman Kardon amp advice ('90s or '00s)

Although I didn’t start the topic, I have to respond to Matt’s excellent post. Everything he vividly described confirms my belief that the PM series is far better than anything HK has made so far.
One piece of advice for you, Matt—replace all the capacitors on the tone control board of the PM665, spray all the buttons with Tuner 6000 spray, and the crackling will disappear.
 
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