FET power amp suddenly bright and crackly

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I have a DH200 I built from a kit in the late 70's early 80's I forget the exact time. It was modded years a go using the Jung mods still works and sounds good on the HiFi

Is the problem on one channel or two. Bright can be a broken input connection or oxidized input connection. The break can be close and act like a low value cap.

I removed the cheap input RCAs and used better ones (if there is a good RCA?)
 
Every single person I've ever know that's had a DH has said they had problems with the input jacks. I changed mine out years ago. I bought this amp used from a friend back in the mid 80's. It's been my PC amp for...... I dunno, 6 years. I never turn it off.
 
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