Panasonic SU-CH7 High frequency cracking sound at high volume

Thread Starter

Joe Nguyen

Joined Aug 31, 2015
Hi all,

I have this Panasonic SU-CH7 (same as Technics SU-CH7) since the 90s. It still kinda work after resting in the garage for many years. I recently unboxed it and touched up all the solder joins on the whole system (all decks). Everything seems to function normally except for one of the high frequency channel (8 ohm speaker output). While the right 8ohm channel still works perfectly, the left channel started to pop at ~ -24db. Yes the fan still work. I begin to wonder if the problem is caused by the high frequency amp IC, or is it related to the filtering board?
I appreciate your comments.