Hifonics Clycops XI

Hello my Friends.Can anybody help me?This Monoblock amplifier has somtimes high frequency noise from the subwoofer.But work is fine!
I made a video from this.
DLM4500 board i can measure the +-15V/60V and TL072D(DL102),LM319(DL101) has +-9V.

 

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