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Old 27th October 2013, 10:55 PM   #1
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Join Date: Jun 2004
Location: T.dot, Canada
Default Jungson JA-88D crackling and static fixed!

No requests or debates, just wanted to share a success:

Over the last year, my Jungson integrated started creating some crackle and noise from the left channel.

Checking the output, measured a dc offset of >200mV, and fluctuating about 50% higher sometimes. It did settle a bit after warning up, but never completely went away.

Found this site with some info on mods and schematics:

JungSonJA88D-09

And located the trim pots top zero the positive and negative offset.

Now the amp is dead quiet! I think one of the protection circuits may have been fighting the output to try and reduce the offset.

Hopefully this may help someone in the future.
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