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Harmon Kardon PM665 noise problem - pls hlp

C

ccsad5

New Member
I have just joined AK and was hoping someone might offer some advise on a problem I have with my HK PM665, Intermittently it pushes 45V DC into left speakers, bump the amp, play with balance or bass and sometimes goes away but is now a problem most of the time rather than at first when it was only rarely. Any ideas on what I can do to track the problem, I took out the balance pot alltogether but problem persisted. (oops title misspelt - Harman Kardon)
 
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If it puts 45vdc into ONLY your left speaker, then the problem is in the power amplifier section, not in the preamp.

My experience with these is that transistors in the power amp tear loose from their solder pads due to repeated expansion and contraction from heat. Discharge your main power supply electrolytics, and then resolder all the driver and pre-driver transistors in the power amps.

Best,

Fred
 
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