Panasonic SU-CH7 High frequency cracking sound at high volume

Discussion in 'General Electronics Chat' started by Joe Nguyen, Aug 31, 2015.

  1. Joe Nguyen

    Thread Starter New Member

    Aug 31, 2015
    1
    0
    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.
     
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